Flashbench-results June 2012

flashbench-results@lists.linaro.org

6 participants
11 discussions

flashbench result Transcend TS32GSSD18M-M (32GB MLC SATA/USB)

by Andreas Mohr

Hi, ./flashbench -a /dev/sdb2 --blocksize=1024 align 8589934592 pre 371µs on 736µs post 370µs diff 365µs align 4294967296 pre 371µs on 739µs post 370µs diff 368µs align 2147483648 pre 370µs on 737µs post 371µs diff 366µs align 1073741824 pre 370µs on 740µs post 371µs diff 370µs align 536870912 pre 371µs on 740µs post 369µs diff 370µs align 268435456 pre 371µs on 752µs post 371µs diff 381µs align 134217728 pre 371µs on 739µs post 370µs diff 368µs align 67108864 pre 370µs on 738µs post 369µs diff 368µs align 33554432 pre 389µs on 741µs post 370µs diff 361µs align 16777216 pre 387µs on 737µs post 370µs diff 359µs align 8388608 pre 370µs on 738µs post 370µs diff 368µs align 4194304 pre 371µs on 736µs post 371µs diff 365µs align 2097152 pre 384µs on 736µs post 370µs diff 359µs align 1048576 pre 389µs on 736µs post 371µs diff 356µs align 524288 pre 370µs on 734µs post 370µs diff 364µs align 262144 pre 371µs on 735µs post 370µs diff 364µs align 131072 pre 384µs on 734µs post 369µs diff 358µs align 65536 pre 404µs on 737µs post 371µs diff 349µs align 32768 pre 401µs on 743µs post 369µs diff 358µs align 16384 pre 405µs on 485µs post 370µs diff 97.1µs align 8192 pre 383µs on 439µs post 371µs diff 61.5µs align 4096 pre 372µs on 415µs post 370µs diff 44.2µs align 2048 pre 404µs on 425µs post 371µs diff 37.1µs So, this appears to indicate that the erase block size of Transcend TS32GSSD18M-M is 32kB. Thanks for a very useful tool, Andreas Mohr

14 years

SanDisk Ultra SDHC 32GB SDSDU-032G-A11

by Andrew Bradford

xubuntu@xubuntu:~$ head /sys/block/mmcblk0/device/* 2>/dev/null | grep -v ^$ ==> /sys/block/mmcblk0/device/block <== ==> /sys/block/mmcblk0/device/cid <== 0353445355333247808222e6e500c200 ==> /sys/block/mmcblk0/device/csd <== 400e00325b590000edc87f800a404000 ==> /sys/block/mmcblk0/device/date <== 02/2012 ==> /sys/block/mmcblk0/device/driver <== ==> /sys/block/mmcblk0/device/erase_size <== 512 ==> /sys/block/mmcblk0/device/fwrev <== 0x0 ==> /sys/block/mmcblk0/device/hwrev <== 0x8 ==> /sys/block/mmcblk0/device/manfid <== 0x000003 ==> /sys/block/mmcblk0/device/name <== SU32G ==> /sys/block/mmcblk0/device/oemid <== 0x5344 ==> /sys/block/mmcblk0/device/power <== ==> /sys/block/mmcblk0/device/preferred_erase_size <== 4194304 ==> /sys/block/mmcblk0/device/scr <== 0235800100000000 ==> /sys/block/mmcblk0/device/serial <== 0x8222e6e5 ==> /sys/block/mmcblk0/device/subsystem <== ==> /sys/block/mmcblk0/device/type <== SD ==> /sys/block/mmcblk0/device/uevent <== DRIVER=mmcblk MMC_TYPE=SD MMC_NAME=SU32G MODALIAS=mmc:block andrew@bigbox:~$ sudo sfdisk -uS -l /dev/sdc Disk /dev/sdc: 30436 cylinders, 64 heads, 32 sectors/track Warning: The partition table looks like it was made for C/H/S=*/255/63 (instead of 30436/64/32). For this listing I'll assume that geometry. Units = sectors of 512 bytes, counting from 0 Device Boot Start End #sectors Id System /dev/sdc1 8192 62333951 62325760 c W95 FAT32 (LBA) /dev/sdc2 0 - 0 0 Empty /dev/sdc3 0 - 0 0 Empty /dev/sdc4 0 - 0 0 Empty andrew@bigbox:~$ sudo fdisk -l /dev/sdc | grep Disk Disk /dev/sdc: 31.9 GB, 31914983424 bytes andrew@bigbox:~$ factor 31914983424 31914983424: 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 103 197 # Maybe another 1.5 MiB or 6 MiB erase block SanDisk card? # If this card has a multiple of 1.5MiB erase blocks, the stock partition map is not aligned according to sfdisk. andrew@bigbox:~/flashbench$ sudo ./flashbench -a /dev/sdc --blocksize=1024 --count=100 align 8589934592 pre 1.07ms on 1.24ms post 1.06ms diff 178µs align 4294967296 pre 1.09ms on 1.31ms post 1.09ms diff 225µs align 2147483648 pre 1.08ms on 1.31ms post 1.1ms diff 223µs align 1073741824 pre 1.08ms on 1.32ms post 1.1ms diff 229µs align 536870912 pre 1.09ms on 1.32ms post 1.1ms diff 226µs align 268435456 pre 1.09ms on 1.31ms post 1.1ms diff 212µs align 134217728 pre 1.08ms on 1.3ms post 1.1ms diff 213µs align 67108864 pre 1.09ms on 1.31ms post 1.1ms diff 218µs align 33554432 pre 1.09ms on 1.31ms post 1.09ms diff 220µs align 16777216 pre 1.06ms on 1.32ms post 1.1ms diff 236µs align 8388608 pre 1.09ms on 1.31ms post 1.1ms diff 216µs align 4194304 pre 1.06ms on 1.21ms post 1.07ms diff 150µs align 2097152 pre 1.06ms on 1.07ms post 1.07ms diff 101ns align 1048576 pre 1.06ms on 1.07ms post 1.06ms diff 8.08µs align 524288 pre 1.06ms on 1.17ms post 1.06ms diff 113µs align 262144 pre 1.05ms on 1.06ms post 1.06ms diff 2.25µs align 131072 pre 1.07ms on 1.06ms post 1.07ms diff -10257n align 65536 pre 1.05ms on 1.07ms post 1.06ms diff 16.6µs align 32768 pre 1.06ms on 1.06ms post 1.06ms diff 5.37µs align 16384 pre 1.05ms on 1.06ms post 1.05ms diff 7.25µs align 8192 pre 1.06ms on 1.06ms post 1.06ms diff -179ns align 4096 pre 1.05ms on 1.06ms post 1.06ms diff 8.48µs align 2048 pre 1.06ms on 1.06ms post 1.07ms diff -5206ns # Looks like 4 MiB erase blocks from that but it's not definite. Page size looks to be in the noise. andrew@bigbox:~/flashbench$ sudo ./flashbench -a /dev/sdc --blocksize=3072 --count=100 align 6442450944 pre 1.11ms on 1.35ms post 1.12ms diff 229µs align 3221225472 pre 1.13ms on 1.42ms post 1.13ms diff 289µs align 1610612736 pre 1.14ms on 1.46ms post 1.13ms diff 329µs align 805306368 pre 1.1ms on 1.42ms post 1.13ms diff 305µs align 402653184 pre 1.15ms on 1.43ms post 1.12ms diff 299µs align 201326592 pre 1.15ms on 1.44ms post 1.16ms diff 280µs align 100663296 pre 1.13ms on 1.44ms post 1.12ms diff 316µs align 50331648 pre 1.13ms on 1.44ms post 1.15ms diff 299µs align 25165824 pre 1.13ms on 1.44ms post 1.14ms diff 311µs align 12582912 pre 1.09ms on 1.28ms post 1.11ms diff 177µs align 6291456 pre 1.14ms on 1.12ms post 1.15ms diff -26264n align 3145728 pre 1.11ms on 1.11ms post 1.09ms diff 9.72µs align 1572864 pre 1.11ms on 1.11ms post 1.11ms diff -738ns align 786432 pre 1.09ms on 1.09ms post 1.14ms diff -27521n align 393216 pre 1.1ms on 1.1ms post 1.13ms diff -9959ns align 196608 pre 1.08ms on 1.08ms post 1.1ms diff -8921ns align 98304 pre 1.08ms on 1.09ms post 1.08ms diff 11.8µs align 49152 pre 1.1ms on 1.1ms post 1.1ms diff -4311ns align 24576 pre 1.09ms on 1.13ms post 1.16ms diff 2.67µs align 12288 pre 1.11ms on 1.12ms post 1.15ms diff -17144n align 6144 pre 1.1ms on 1.11ms post 1.12ms diff -4591ns # 12 MiB stands out. Interesting. # Open-au tests with 6 MiB assumed erase block: andrew@bigbox:~/flashbench$ sudo ./flashbench /dev/sdc --open-au --erasesize=$[6*1024*1024] --blocksize=$[6*1024] --open-au-nr=1 6MiB 17.4M/s 3MiB 17.5M/s 1.5MiB 17.4M/s 768KiB 17.8M/s 384KiB 17.8M/s 192KiB 19.1M/s 96KiB 19.4M/s 48KiB 18.5M/s 24KiB 15.9M/s 12KiB 12.3M/s 6KiB 8.21M/s andrew@bigbox:~/flashbench$ sudo ./flashbench /dev/sdc --open-au --erasesize=$[6*1024*1024] --blocksize=$[6*1024] --open-au-nr=2 6MiB 17.2M/s 3MiB 17.3M/s 1.5MiB 17.6M/s 768KiB 17.2M/s 384KiB 16.9M/s 192KiB 17.6M/s 96KiB 15.9M/s 48KiB 14.5M/s 24KiB 10.2M/s 12KiB 4.54M/s 6KiB 2.48M/s andrew@bigbox:~/flashbench$ sudo ./flashbench /dev/sdc --open-au --erasesize=$[6*1024*1024] --blocksize=$[6*1024] --open-au-nr=6 6MiB 11.4M/s 3MiB 17.3M/s 1.5MiB 17.3M/s 768KiB 17.2M/s 384KiB 16.9M/s 192KiB 17.5M/s 96KiB 16M/s 48KiB 14.2M/s 24KiB 9.89M/s 12KiB 4.49M/s 6KiB 2.42M/s andrew@bigbox:~/flashbench$ sudo ./flashbench /dev/sdc --open-au --erasesize=$[6*1024*1024] --blocksize=$[6*1024] --open-au-nr=7 6MiB 9.34M/s 3MiB 12.3M/s 1.5MiB 9.58M/s 768KiB 10.2M/s 384KiB 9.54M/s 192KiB 11.6M/s 96KiB 8.54M/s 48KiB 8.13M/s 24KiB 5.68M/s 12KiB 3.56M/s 6KiB 2.12M/s # 6 open linear erase blocks, not bad. ## Different day of testing below, thus different /dev/sdX andrew@flashy:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=$[6*1024*1024] --blocksize=$[12*1024] --open-au-nr=1 --random 6MiB 18.9M/s 3MiB 19.8M/s 1.5MiB 19M/s 768KiB 18.1M/s 384KiB 15M/s 192KiB 9.19M/s 96KiB 4.3M/s 48KiB 2.14M/s 24KiB 966K/s 12KiB 2.13M/s # Hitting K/s with 1 random open-au, probably can't do random. Things don't fall off going to more open-au but stay this slow. andrew@flashy:~/flashbench$ sudo ./flashbench /dev/sdd --findfat --erasesize=$[6*1024*1024] --blocksize=$[12*1024] 6MiB 13.1M/s 7.98M/s 18.2M/s 19.3M/s 19.8M/s 19.2M/s 3MiB 14M/s 8.41M/s 19.8M/s 19.9M/s 18.5M/s 19.8M/s 1.5MiB 14.2M/s 7.54M/s 19.1M/s 19.8M/s 19.8M/s 19.8M/s 768KiB 13.9M/s 7.27M/s 19.2M/s 19.5M/s 19.7M/s 19.5M/s 384KiB 12.7M/s 7.4M/s 19.3M/s 19.4M/s 18.5M/s 19.5M/s 192KiB 12.6M/s 7.79M/s 18.6M/s 19.6M/s 19.5M/s 19.5M/s 96KiB 12.3M/s 6.65M/s 19.1M/s 19.6M/s 19.5M/s 19.6M/s 48KiB 12.1M/s 7.13M/s 18.1M/s 18.1M/s 17M/s 18.1M/s 24KiB 10.6M/s 8.64M/s 14.9M/s 15.5M/s 15.4M/s 15.5M/s 12KiB 8.63M/s 6.7M/s 12.2M/s 12M/s 12.2M/s 12.3M/s andrew@flashy:~/flashbench$ sudo ./flashbench /dev/sdd --findfat --erasesize=$[4*1024*1024] --blocksize=$[16*1024] 4MiB 19.7M/s 7.54M/s 7.98M/s 19.7M/s 19.9M/s 18.9M/s 2MiB 19.1M/s 8.28M/s 7.44M/s 19.7M/s 19.9M/s 18.8M/s 1MiB 19M/s 7.5M/s 7.3M/s 19.5M/s 19.9M/s 19M/s 512KiB 18.8M/s 8.66M/s 8.98M/s 19.5M/s 19.1M/s 19.7M/s 256KiB 17.9M/s 7.29M/s 7.99M/s 19.2M/s 19.3M/s 19.4M/s 128KiB 17.5M/s 8.04M/s 7.25M/s 18.6M/s 18.6M/s 18.7M/s 64KiB 17.5M/s 8.43M/s 7.25M/s 18.7M/s 18.7M/s 19M/s 32KiB 15.7M/s 7.35M/s 8.46M/s 16.8M/s 17M/s 16.6M/s 16KiB 13.1M/s 6.6M/s 9.42M/s 13.6M/s 13.3M/s 13.7M/s andrew@flashy:~/flashbench$ sudo ./flashbench /dev/sdd --findfat --erasesize=$[2*1024*1024] --blocksize=$[16*1024] --fat-nr=7 2MiB 16M/s 18.6M/s 10.2M/s 12.7M/s 9.64M/s 9.96M/s 18.3M/s 1MiB 17.6M/s 18.9M/s 9.25M/s 5.58M/s 7.62M/s 7M/s 19.6M/s 512KiB 18.4M/s 19.5M/s 7.15M/s 8.4M/s 8.91M/s 7.25M/s 19.3M/s 256KiB 18.1M/s 18.2M/s 7.37M/s 7.5M/s 6.59M/s 5.45M/s 18.8M/s 128KiB 17.5M/s 17.4M/s 7.51M/s 7.03M/s 7.4M/s 6.92M/s 18.5M/s 64KiB 17.9M/s 18.9M/s 7.11M/s 7.55M/s 7.3M/s 8.28M/s 18.6M/s 32KiB 16M/s 16.9M/s 6.74M/s 6.87M/s 8.57M/s 6.82M/s 15.7M/s 16KiB 12.9M/s 13M/s 8.74M/s 7.61M/s 6.54M/s 6.75M/s 12.9M/s # So, the first 12 MiB are special. But the first 4 MiB are "more" special somehow. This possibly explains the sector offset in sfdisk, starting the partition at 4 MiB may be the right thing to do. Special fat area goes from 4 MiB to 12 MiB. andrew@flashy:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=$[6*1024*1024] --blocksize=$[12*1024] --open-au-nr=6 --offset=$[24*1024*1024] 6MiB 13.5M/s 3MiB 15.1M/s 1.5MiB 18.4M/s 768KiB 18.2M/s 384KiB 17.4M/s 192KiB 17.7M/s 96KiB 16.6M/s 48KiB 14.2M/s 24KiB 9.83M/s 12KiB 4.37M/s andrew@flashy:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=$[6*1024*1024] --blocksize=$[12*1024] --open-au-nr=6 --offset=$[23*1024*1024] 6MiB 18.1M/s 3MiB 18.5M/s 1.5MiB 18.3M/s 768KiB 18.1M/s 384KiB 17.6M/s 192KiB 16.9M/s 96KiB 16.7M/s 48KiB 13.8M/s 24KiB 9.8M/s 12KiB 4.38M/s # I expected 23 MiB offset to be slower than 24 MiB offset... andrew@flashy:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=$[6*1024*1024] --blocksize=$[12*1024] --open-au-nr=6 --offset=$[25*1024*1024] 6MiB 10.2M/s 3MiB 6.4M/s 1.5MiB 10.6M/s 768KiB 10.8M/s 384KiB 9.85M/s 192KiB 10.9M/s 96KiB 11.9M/s 48KiB 9.43M/s 24KiB 7.64M/s 12KiB 3.67M/s # Possibly 6 MiB is not the correct erase block size. Interesting. andrew@flashy:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=$[4*1024*1024] --blocksize=$[16*1024] --open-au-nr=6 --offset=$[25*1024*1024] 4MiB 19.4M/s 2MiB 19.3M/s 1MiB 19.2M/s 512KiB 18.5M/s 256KiB 17.9M/s 128KiB 16.7M/s 64KiB 15.4M/s 32KiB 12.1M/s 16KiB 8.45M/s # 25 MiB offset w/ 4 MiB erase block keeps us within the bounds. Probably 8 MiB erase blocks but they start at 12 MiB into the disk. andrew@flashy:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=$[6*1024*1024] --blocksize=$[12*1024] --open-au-nr=6 --offset=$[35*1024*1024] 6MiB 19.5M/s 3MiB 19.5M/s 1.5MiB 19.1M/s 768KiB 19M/s 384KiB 18.4M/s 192KiB 17.9M/s 96KiB 16.6M/s 48KiB 14.1M/s 24KiB 9.85M/s 12KiB 4.39M/s andrew@flashy:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=$[6*1024*1024] --blocksize=$[12*1024] --open-au-nr=6 --offset=$[37*1024*1024] 6MiB 7.9M/s 3MiB 10.6M/s 1.5MiB 11.8M/s 768KiB 10M/s 384KiB 10.3M/s 192KiB 10.9M/s 96KiB 11.9M/s 48KiB 9.42M/s 24KiB 7.63M/s 12KiB 3.46M/s andrew@flashy:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=$[4*1024*1024] --blocksize=$[16*1024] --open-au-nr=6 --offset=$[41*1024*1024] 4MiB 11.2M/s 2MiB 19.3M/s 1MiB 19.1M/s 512KiB 18.7M/s 256KiB 18.1M/s 128KiB 16.7M/s 64KiB 15.4M/s 32KiB 12.1M/s 16KiB 8.51M/s # 41 MiB should have been slow... # Possibly I get the slow result when spanning 3 erase blocks and the true erase block size is 4 MiB or 3 MiB? # As then it would be like my --open-au-nr=7 run, similar slowness. andrew@flashy:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=$[3*1024*1024] --blocksize=$[12*1024] --open-au-nr=6 --offset=$[36*1024*1024-512*1024] 3MiB 19.1M/s 1.5MiB 19.4M/s 768KiB 18.6M/s 384KiB 18.1M/s 192KiB 17.8M/s 96KiB 16.4M/s 48KiB 14M/s 24KiB 9.87M/s 12KiB 4.4M/s andrew@flashy:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=$[6*1024*1024] --blocksize=$[12*1024] --open-au-nr=6 --offset=$[36*1024*1024-512*1024] 6MiB 6.13M/s 3MiB 6.09M/s 1.5MiB 10.2M/s 768KiB 8.77M/s 384KiB 9.47M/s 192KiB 13M/s 96KiB 12.4M/s 48KiB 8.76M/s 24KiB 8M/s 12KiB 4.01M/s # So somewhere between 38.5 MiB and 41.5 MiB is an erase block boundary. andrew@flashy:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=$[6*1024*1024] --blocksize=$[12*1024] --open-au-nr=6 --offset=$[35*1024*1024-512*1024] 6MiB 10.2M/s 3MiB 6.85M/s 1.5MiB 7.71M/s 768KiB 6.12M/s 384KiB 7.9M/s 192KiB 7.69M/s ^C andrew@flashy:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=$[6*1024*1024] --blocksize=$[12*1024] --open-au-nr=6 --offset=$[34*1024*1024-512*1024] 6MiB 10.2M/s 3MiB 11.3M/s 1.5MiB 19.3M/s 768KiB 19.1M/s 384KiB 18.5M/s 192KiB 18M/s 96KiB 16.6M/s ^C # Between 39.5 and 40.5 MiB is an erase block boundary. So 40 MiB it is! # 40 - 12 = 28. 28 isn't divisible by 3. So I'm going to go with 4 MiB erase blocks. andrew@flashy:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=$[4*1024*1024] --blocksize=$[16*1024] --open-au-nr=11 --offset=$[40*1024*1024] 4MiB 15.7M/s 2MiB 10.6M/s 1MiB 19.2M/s 512KiB 18.8M/s 256KiB 18M/s 128KiB 16.7M/s 64KiB 15.2M/s 32KiB 11.7M/s 16KiB 8.17M/s andrew@flashy:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=$[4*1024*1024] --blocksize=$[16*1024] --open-au-nr=12 --offset=$[40*1024*1024] 4MiB 16.5M/s 2MiB 12M/s 1MiB 10.3M/s 512KiB 10.4M/s 256KiB 9.96M/s 128KiB 9.68M/s 64KiB 11.3M/s 32KiB 9.42M/s 16KiB 7.21M/s # Using 4 MiB erase blocks, now 11 open-au linear. andrew@flashy:~/flashbench$ sudo ./flashbench /dev/sdd --open-au --erasesize=$[4*1024*1024] --blocksize=$[16*1024] --open-au-nr=1 --offset=$[40*1024*1024] --random 4MiB 19.2M/s 2MiB 19.4M/s 1MiB 19.1M/s 512KiB 18.8M/s 256KiB 12.2M/s 128KiB 5.03M/s 64KiB 2.53M/s 32KiB 1.26M/s 16KiB 601K/s # Still stinks at random. -Andrew

14 years

Samsung 8GB microSDHC "Essential" Class 6

by Arnd Bergmann

Label on packaging: Class 6 Read: Max 24MB/s Write: Max 13 MB/s Label on Card: front (blue): 8 GB back: CE MMBTR08GUBCA-ME I CYG498GA 135 Made in TAIWAN head /sys/block/mmcblk0/device/* ==> /sys/block/mmcblk0/device/cid <== 1b534d30303030301001952e5c00b900 ==> /sys/block/mmcblk0/device/csd <== 400e00325b5900003b577f800a400000 ==> /sys/block/mmcblk0/device/date <== 09/2011 ==> /sys/block/mmcblk0/device/erase_size <== 512 ==> /sys/block/mmcblk0/device/fwrev <== 0x0 ==> /sys/block/mmcblk0/device/hwrev <== 0x1 ==> /sys/block/mmcblk0/device/manfid <== 0x00001b ==> /sys/block/mmcblk0/device/name <== 00000 ==> /sys/block/mmcblk0/device/oemid <== 0x534d ==> /sys/block/mmcblk0/device/preferred_erase_size <== 4194304 ==> /sys/block/mmcblk0/device/scr <== 0235800000000000 ==> /sys/block/mmcblk0/device/serial <== 0x01952e5c ==> /sys/block/mmcblk0/device/type <== SD ==> /sys/block/mmcblk0/device/uevent <== DRIVER=mmcblk MMC_TYPE=SD MMC_NAME=00000 MODALIAS=mmc:block $ sudo fdisk -lu /dev/mmcblk0 Disk /dev/mmcblk0: 7964 MB, 7964983296 bytes 91 heads, 18 sectors/track, 9497 cylinders, total 15556608 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/mmcblk0p1 8192 15556607 7774208 b W95 FAT32 $ factor 15556608 15556608: 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 211 $ sudo ./flashbench -a /dev/mmcblk0 --blocksize=1024align 805306368 pre 817µs on 1.17ms post 784µs diff 373µs align 536870912 pre 940µs on 1.24ms post 851µs diff 344µs align 402653184 pre 835µs on 1.18ms post 797µs diff 363µs align 268435456 pre 968µs on 1.23ms post 868µs diff 313µs align 201326592 pre 833µs on 1.18ms post 780µs diff 371µs align 134217728 pre 949µs on 1.24ms post 846µs diff 341µs align 100663296 pre 820µs on 1.17ms post 784µs diff 371µs align 67108864 pre 967µs on 1.27ms post 876µs diff 345µs align 50331648 pre 834µs on 1.18ms post 778µs diff 373µs align 33554432 pre 975µs on 1.24ms post 850µs diff 327µs align 25165824 pre 839µs on 1.17ms post 782µs diff 362µs align 16777216 pre 980µs on 1.27ms post 879µs diff 336µs align 12582912 pre 812µs on 1.14ms post 781µs diff 348µs align 8388608 pre 939µs on 1.22ms post 849µs diff 322µs align 6291456 pre 749µs on 1.13ms post 809µs diff 347µs align 4194304 pre 806µs on 1.06ms post 819µs diff 248µs align 3145728 pre 696µs on 790µs post 783µs diff 50µs align 2097152 pre 800µs on 1.04ms post 800µs diff 242µs align 1572864 pre 693µs on 790µs post 792µs diff 48.4µs align 1048576 pre 690µs on 803µs post 805µs diff 55.4µs align 786432 pre 723µs on 821µs post 816µs diff 51.8µs align 524288 pre 688µs on 790µs post 801µs diff 45.1µs align 393216 pre 699µs on 796µs post 792µs diff 50.1µs align 262144 pre 696µs on 807µs post 807µs diff 55.7µs align 196608 pre 725µs on 822µs post 823µs diff 48.3µs align 131072 pre 693µs on 794µs post 802µs diff 46.7µs align 98304 pre 716µs on 820µs post 825µs diff 49.2µs align 65536 pre 684µs on 790µs post 796µs diff 50.3µs align 49152 pre 717µs on 813µs post 821µs diff 43.7µs align 32768 pre 703µs on 806µs post 800µs diff 54.1µs align 24576 pre 717µs on 810µs post 822µs diff 40.7µs align 16384 pre 708µs on 801µs post 812µs diff 40.2µs align 12288 pre 762µs on 756µs post 754µs diff -2647ns align 8192 pre 718µs on 805µs post 821µs diff 36.1µs align 6144 pre 737µs on 729µs post 721µs diff 535ns align 4096 pre 777µs on 769µs post 761µs diff -199ns align 3072 pre 774µs on 775µs post 753µs diff 10.8µs align 2048 pre 788µs on 783µs post 773µs diff 2.25µs $ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=$[3*8192] --erasesize=$[6*1024*1024] --open-au-nr=2 6MiB 7.73M/s 3MiB 6.04M/s 1.5MiB 7.7M/s 768KiB 7.68M/s 384KiB 7.68M/s 192KiB 7.67M/s 96KiB 6.56M/s 48KiB 6.05M/s 24KiB 4.04M/s $ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=$[3*8192] --erasesize=$[6*1024*1024] --open-au-nr=3 6MiB 7.69M/s 3MiB 5.08M/s 1.5MiB 2.92M/s 768KiB 2.25M/s 384KiB 1.54M/s 192KiB 1.48M/s 96KiB 1.09M/s 48KiB 1.1M/s 24KiB 1.08M/s $ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=$[3*8192] --erasesize=$[6*1024*1024] --open-au-nr=1 --random 6MiB 3.16M/s 3MiB 1.77M/s 1.5MiB 1.4M/s 768KiB 583K/s 384KiB 331K/s 192KiB 166K/s

14 years

Samsung 8GB SDHC "Essential" Class 6

by Arnd Bergmann

Label on packaging: Class 6 Read: Max 24MB/s Write: Max 13 MB/s Label on Card: front (red): 8 GB back: MB-SS8GA MBSS8GVCDBCA-RF D OLX00000 1 4 7 MADE IN KOREA DESIGNED BY SAMSUNG head /sys/block/mmcblk0/device/* ==> /sys/block/mmcblk0/device/cid <== 1b534d3030303030100b6b930300bc00 ==> /sys/block/mmcblk0/device/csd <== 400e00325b5900003b577f800a400000 ==> /sys/block/mmcblk0/device/date <== 12/2011 ==> /sys/block/mmcblk0/device/erase_size <== 512 ==> /sys/block/mmcblk0/device/fwrev <== 0x0 ==> /sys/block/mmcblk0/device/hwrev <== 0x1 ==> /sys/block/mmcblk0/device/manfid <== 0x00001b ==> /sys/block/mmcblk0/device/name <== 00000 ==> /sys/block/mmcblk0/device/oemid <== 0x534d ==> /sys/block/mmcblk0/device/preferred_erase_size <== 4194304 ==> /sys/block/mmcblk0/device/scr <== 0235800000000000 ==> /sys/block/mmcblk0/device/serial <== 0x0b6b9303 ==> /sys/block/mmcblk0/device/type <== SD ==> /sys/block/mmcblk0/device/uevent <== DRIVER=mmcblk MMC_TYPE=SD MMC_NAME=00000 MODALIAS=mmc:block Disk /dev/mmcblk0: 7964 MB, 7964983296 bytes 91 heads, 18 sectors/track, 9497 cylinders, total 15556608 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/mmcblk0p1 8192 15556607 7774208 b W95 FAT32 $ factor 7964983296 7964983296: 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 211 $ sudo ./flashbench -a /dev/mmcblk0 --blocksize=1024 align 805306368 pre 813µs on 1.03ms post 694µs diff 274µs align 536870912 pre 841µs on 1.1ms post 772µs diff 295µs align 402653184 pre 788µs on 1.06ms post 710µs diff 312µs align 268435456 pre 805µs on 1.09ms post 772µs diff 303µs align 201326592 pre 794µs on 1.05ms post 691µs diff 311µs align 134217728 pre 851µs on 1.1ms post 771µs diff 288µs align 100663296 pre 794µs on 1.05ms post 695µs diff 303µs align 67108864 pre 852µs on 1.11ms post 779µs diff 293µs align 50331648 pre 793µs on 1.05ms post 695µs diff 307µs align 33554432 pre 850µs on 1.1ms post 772µs diff 292µs align 25165824 pre 794µs on 1.05ms post 693µs diff 309µs align 16777216 pre 855µs on 1.11ms post 782µs diff 288µs align 12582912 pre 755µs on 1.03ms post 695µs diff 302µs align 8388608 pre 798µs on 1.08ms post 777µs diff 296µs align 6291456 pre 726µs on 1.01ms post 718µs diff 287µs align 4194304 pre 705µs on 939µs post 734µs diff 219µs align 3145728 pre 619µs on 715µs post 716µs diff 47.2µs align 2097152 pre 687µs on 922µs post 721µs diff 218µs align 1572864 pre 621µs on 711µs post 715µs diff 43.5µs align 1048576 pre 615µs on 724µs post 729µs diff 51.9µs align 786432 pre 620µs on 714µs post 715µs diff 46.9µs align 524288 pre 610µs on 712µs post 725µs diff 44.4µs align 393216 pre 620µs on 714µs post 710µs diff 49.2µs align 262144 pre 616µs on 719µs post 724µs diff 48.5µs align 196608 pre 619µs on 712µs post 713µs diff 46.2µs align 131072 pre 614µs on 711µs post 722µs diff 42.4µs align 98304 pre 615µs on 705µs post 714µs diff 40.7µs align 65536 pre 614µs on 712µs post 723µs diff 43.7µs align 49152 pre 614µs on 697µs post 709µs diff 35.5µs align 32768 pre 615µs on 712µs post 710µs diff 49.5µs align 24576 pre 617µs on 702µs post 715µs diff 35.8µs align 16384 pre 617µs on 702µs post 716µs diff 35.7µs align 12288 pre 678µs on 668µs post 659µs diff -688ns align 8192 pre 617µs on 710µs post 717µs diff 43.1µs align 6144 pre 647µs on 642µs post 635µs diff 1.09µs align 4096 pre 677µs on 671µs post 662µs diff 1.85µs align 3072 pre 691µs on 686µs post 672µs diff 4.76µs align 2048 pre 705µs on 701µs post 691µs diff 2.92µs # Trying 2 MB erase size (not likely) $ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=1024 --erasesize=$[1024*1024*2] 2MiB 6.64M/s 1MiB 3.37M/s 512KiB 2.76M/s 256KiB 2.7M/s 128KiB 3.12M/s 64KiB 3.12M/s 32KiB 2.75M/s 16KiB 2.33M/s 8KiB 1.98M/s 4KiB 981K/s 2KiB 420K/s 1KiB 211K/s # trying 6 MB erase size (looks right) $ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=$[3*8192] --erasesize=$[6*1024*1024] 12MiB 8.03M/s 6MiB 7.99M/s 3MiB 7.99M/s 1.5MiB 7.98M/s 768KiB 8.03M/s 384KiB 7.78M/s 192KiB 8M/s 96KiB 6.85M/s 48KiB 6.32M/s 24KiB 4.27M/s # trying 8 MB erase size (supports 6 MB theory) $ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=$[8192] --erasesize=$[8*1024*1024*2] 16MiB 6.77M/s 8MiB 5.81M/s 4MiB 5.76M/s 2MiB 5.75M/s 1MiB 5.76M/s 512KiB 5.77M/s 256KiB 5.74M/s 128KiB 5.74M/s 64KiB 5.7M/s 32KiB 4.24M/s 16KiB 2.15M/s 8KiB 1.29M/s # Countertest with 3 MB blocks: $ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=$[3*8192] --erasesize=$[3*1024*1024] --open-au-nr=2 3MiB 4.55M/s 1.5MiB 4.53M/s 768KiB 4.55M/s 384KiB 4.55M/s 192KiB 4.53M/s 96KiB 4.14M/s 48KiB 3.94M/s 24KiB 2.99M/s # one 6 MB block, random access, not good: $ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=$[3*8192] --erasesize=$[6*1024*1024] --random 6MiB 7.95M/s 3MiB 5.7M/s 1.5MiB 5.07M/s 768KiB 2M/s 384KiB 1.12M/s 192KiB 509K/s 96KiB 243K/s 48KiB 175K/s 24KiB 175K/s # trying two blocks of 6 MB linear instead, works fine: 6MiB 7.86M/s 3MiB 8.01M/s 1.5MiB 8.03M/s 768KiB 8.01M/s 384KiB 8.03M/s 192KiB 8.02M/s 96KiB 6.87M/s 48KiB 6.33M/s 24KiB 4.3M/s # Three blocks fail: $ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=$[3*8192] --erasesize=$[6*1024*1024] --open-au-nr=3 6MiB 8.02M/s 3MiB 5.28M/s 1.5MiB 3.05M/s 768KiB 2.35M/s 384KiB 1.64M/s 192KiB 1.55M/s 96KiB 1.14M/s 48KiB 1.15M/s 24KiB 1.12M/s # Four blocks fail in a worse manner: $ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=$[3*8192] --erasesize=$[6*1024*1024] --open-au-nr=4 6MiB 5.29M/s 3MiB 5.08M/s 1.5MiB 2.77M/s 768KiB 1.26M/s 384KiB 648K/s ^C

14 years

Transcend JetFlash 700 32GB USB3 Drive TS32GJF700

by Andrew Bradford

Transcend JetFlash 700 32GB TS32GJF700 USB3 USB drive, testing in USB2 port. Had some issues at first but after wiping the partition table, those seem to have gone away. They may be caused by my host somewhat and not entirely be the USB drive's fault but I've not investigated further. I've included the problem output here, if anyone has any suggestions as to the root cause, please let me know. [andrew@mythdvr ~]$ lsusb Bus 002 Device 003: ID 8564:1000 [andrew@mythdvr ~]$ dmesg | tail # with some editing to reduce lines usb-storage: device found at 3 scsi 9:0:0:0: Direct-Access JetFlash Transcend 32GB 1.00 PQ: 0 ANSI: 5 sd 9:0:0:0: [sdb] 61741056 512-byte logical blocks: (31.6 GB/29.4 GiB) sd 9:0:0:0: [sdb] Write Protect is off sd 9:0:0:0: [sdb] Mode Sense: 23 00 00 00 sd 9:0:0:0: [sdb] Assuming drive cache: write through sd 9:0:0:0: [sdb] Assuming drive cache: write through sdb: sd 9:0:0:0: [sdb] Assuming drive cache: write through sd 9:0:0:0: [sdb] Attached SCSI removable disk [andrew@mythdvr flashbench]$ sudo sfdisk -uS -l /dev/sdb Disk /dev/sdb: 30147 cylinders, 64 heads, 32 sectors/track Units = sectors of 512 bytes, counting from 0 Device Boot Start End #sectors Id System /dev/sdb1 ? 778135908 1919645538 1141509631 72 Unknown start: (c,h,s) expected (1023,63,32) found (357,116,40) end: (c,h,s) expected (1023,63,32) found (357,32,45) /dev/sdb2 ? 168689522 2104717761 1936028240 65 Novell Netware 386 start: (c,h,s) expected (1023,63,32) found (288,115,43) end: (c,h,s) expected (1023,63,32) found (367,114,50) /dev/sdb3 ? 1869881465 3805909656 1936028192 79 Unknown start: (c,h,s) expected (1023,63,32) found (366,32,33) end: (c,h,s) expected (1023,63,32) found (357,32,43) /dev/sdb4 ? 2885681152 2885736650 55499 d Unknown start: (c,h,s) expected (1023,63,32) found (372,97,50) end: (c,h,s) expected (1023,63,32) found (0,10,0) # That's a very odd table. # 64 heads / 32 sectors should indicate erase block size is a power of 2 if Transcend is doing that on purpose. [andrew@mythdvr flashbench]$ sudo fdisk -l /dev/sdb | grep Disk Disk /dev/sdb: 31.6 GB, 31611420672 bytes Disk identifier: 0x6f20736b [andrew@mythdvr flashbench]$ factor 31611420672 31611420672: 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 13 773 [andrew@mythdvr flashbench]$ sudo ./flashbench -a /dev/sdb --blocksize=4096 align 8589934592 pre 1.12ms on 1.52ms post 1.24ms diff 334Âµs align 4294967296 pre 1.12ms on 1.61ms post 1.24ms diff 423Âµs align 2147483648 pre 1.12ms on 1.6ms post 1.24ms diff 423Âµs align 1073741824 pre 1.12ms on 1.46ms post 1.23ms diff 283Âµs align 536870912 pre 1.11ms on 1.45ms post 1.18ms diff 309Âµs align 268435456 pre 1.11ms on 1.46ms post 1.24ms diff 281Âµs align 134217728 pre 1.11ms on 1.46ms post 1.24ms diff 287Âµs align 67108864 pre 1.11ms on 1.46ms post 1.22ms diff 290Âµs align 33554432 pre 1.11ms on 1.46ms post 1.24ms diff 280Âµs align 16777216 pre 1.11ms on 1.45ms post 1.22ms diff 284Âµs align 8388608 pre 1.11ms on 1.45ms post 1.17ms diff 308Âµs time_read: Input/output error time_read: Input/output error time_read: Input/output error time_read: Input/output error # Followed by a lot of additional "time_read: Input/output error" lines. # Then the /dev/sdb device goes away. [andrew@mythdvr flashbench]$ dmesg # with slight editing to remove useless lines sd 8:0:0:0: [sdb] Unhandled error code sd 8:0:0:0: [sdb] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK end_request: I/O error, dev sdb, sector 33562624 sd 8:0:0:0: [sdb] Unhandled error code sd 8:0:0:0: [sdb] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK end_request: I/O error, dev sdb, sector 50339840 sd 8:0:0:0: [sdb] Unhandled error code sd 8:0:0:0: [sdb] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK end_request: I/O error, dev sdb, sector 5376000 sd 8:0:0:0: [sdb] Unhandled error code sd 8:0:0:0: [sdb] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK end_request: I/O error, dev sdb, sector 22153216 sd 8:0:0:0: [sdb] Unhandled error code sd 8:0:0:0: [sdb] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK end_request: I/O error, dev sdb, sector 38930432 scsi 8:0:0:0: [sdb] Unhandled error code scsi 8:0:0:0: [sdb] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK end_request: I/O error, dev sdb, sector 8184 # Repartitioned to see if that helps [andrew@mythdvr flashbench]$ sudo sfdisk -uS -l /dev/sdb Disk /dev/sdb: 30147 cylinders, 64 heads, 32 sectors/track Units = sectors of 512 bytes, counting from 0 Device Boot Start End #sectors Id System /dev/sdb1 0 - 0 0 Empty /dev/sdb2 0 - 0 0 Empty /dev/sdb3 0 - 0 0 Empty /dev/sdb4 0 - 0 0 Empty [andrew@mythdvr flashbench]$ sudo ./flashbench -a /dev/sdb --blocksize=1024 align 8589934592 pre 1.02ms on 1.51ms post 1.12ms diff 440Âµs align 4294967296 pre 1.05ms on 1.6ms post 1.12ms diff 515Âµs align 2147483648 pre 1.05ms on 1.6ms post 1.12ms diff 519Âµs align 1073741824 pre 1.05ms on 1.39ms post 1.12ms diff 305Âµs align 536870912 pre 1.05ms on 1.39ms post 1.12ms diff 306Âµs align 268435456 pre 1.05ms on 1.39ms post 1.12ms diff 305Âµs align 134217728 pre 1.05ms on 1.39ms post 1.12ms diff 310Âµs align 67108864 pre 1.04ms on 1.39ms post 1.12ms diff 308Âµs align 33554432 pre 1.05ms on 1.38ms post 1.12ms diff 298Âµs align 16777216 pre 1.05ms on 1.39ms post 1.12ms diff 308Âµs align 8388608 pre 1.05ms on 1.38ms post 1.12ms diff 298Âµs align 4194304 pre 1.11ms on 1.24ms post 1.12ms diff 125Âµs align 2097152 pre 1.11ms on 1.23ms post 1.12ms diff 117Âµs align 1048576 pre 1.12ms on 1.25ms post 1.12ms diff 127Âµs align 524288 pre 1.12ms on 1.25ms post 1.12ms diff 128Âµs align 262144 pre 1.12ms on 1.25ms post 1.12ms diff 126Âµs align 131072 pre 1.12ms on 1.25ms post 1.12ms diff 125Âµs align 65536 pre 1.09ms on 1.12ms post 1.11ms diff 17.2Âµs align 32768 pre 1.12ms on 1.25ms post 1.12ms diff 128Âµs align 16384 pre 1.12ms on 1.25ms post 1.12ms diff 128Âµs align 8192 pre 1.12ms on 1.41ms post 1.12ms diff 286Âµs align 4096 pre 1.11ms on 1.23ms post 1.12ms diff 111Âµs align 2048 pre 1.11ms on 1.12ms post 1.12ms diff 2.8Âµs # Looks like 8 MiB erase block # Page size is hard to tell [andrew@mythdvr flashbench]$ sudo ./flashbench /dev/sdb --open-au --erasesize=$[8*1024*1024] --blocksize=$[16*1024] --open-au-nr=1 8MiB 33.5M/s 4MiB 32.8M/s 2MiB 30M/s 1MiB 33.2M/s 512KiB 32.4M/s 256KiB 30.8M/s 128KiB 29.5M/s 64KiB 30.4M/s 32KiB 26M/s 16KiB 18.6M/s [andrew@mythdvr flashbench]$ sudo ./flashbench /dev/sdb --open-au --erasesize=$[8*1024*1024] --blocksize=$[16*1024] --open-au-nr=2 8MiB 33.2M/s 4MiB 32.6M/s 2MiB 32.1M/s 1MiB 31.3M/s 512KiB 28.5M/s 256KiB 24.5M/s 128KiB 21.8M/s 64KiB 17.2M/s 32KiB 11.1M/s 16KiB 2.26M/s [andrew@mythdvr flashbench]$ sudo ./flashbench /dev/sdb --open-au --erasesize=$[8*1024*1024] --blocksize=$[16*1024] --open-au-nr=6 8MiB 32.6M/s 4MiB 33.2M/s 2MiB 32.4M/s 1MiB 18M/s 512KiB 18.3M/s 256KiB 21.3M/s 128KiB 23.6M/s 64KiB 12.4M/s 32KiB 6.67M/s 16KiB 1.21M/s # Would that be indicative of 128KiB as a minimum write size / page size? It's almost exactly 50% fall off after that. [andrew@mythdvr flashbench]$ sudo ./flashbench /dev/sdb --open-au --erasesize=$[8*1024*1024] --blocksize=$[16*1024] --open-au-nr=7 8MiB 33M/s 4MiB 31.1M/s 2MiB 11M/s 1MiB 9.81M/s 512KiB 8.64M/s 256KiB 9.72M/s 128KiB 6.91M/s 64KiB 7.51M/s 32KiB 4.71M/s 16KiB 1.03M/s # Looks like 6 open erase blocks, but even with 7, performance isn't horrible, just much worse. Just to see, try 12 open erase blocks: [andrew@mythdvr flashbench]$ sudo ./flashbench /dev/sdb --open-au --erasesize=$[8*1024*1024] --blocksize=$[16*1024] --open-au-nr=12 8MiB 32.8M/s 4MiB 20.3M/s 2MiB 9.95M/s 1MiB 6.75M/s 512KiB 4.58M/s 256KiB 5.4M/s 128KiB 5M/s 64KiB 4.05M/s 32KiB 2.09M/s 16KiB 677K/s # Definitely worse, but still not really horrible like some SD cards get. [andrew@mythdvr flashbench]$ sudo ./flashbench /dev/sdb --open-au --erasesize=$[8*1024*1024] --blocksize=$[16*1024] --random --open-au-nr=1 8MiB 32.5M/s 4MiB 33.1M/s 2MiB 33.3M/s 1MiB 33.5M/s 512KiB 32.6M/s 256KiB 31M/s 128KiB 11.4M/s 64KiB 6.1M/s 32KiB 12.5M/s 16KiB 2.48M/s [andrew@mythdvr flashbench]$ sudo ./flashbench /dev/sdb --open-au --erasesize=$[8*1024*1024] --blocksize=$[16*1024] --random --open-au-nr=2 8MiB 32.5M/s 4MiB 33.3M/s 2MiB 32.8M/s 1MiB 10.8M/s 512KiB 6.71M/s 256KiB 7.05M/s 128KiB 3.73M/s 64KiB 4.41M/s 32KiB 3.36M/s 16KiB 1.7M/s [andrew@mythdvr flashbench]$ sudo ./flashbench /dev/sdb --open-au --erasesize=$[8*1024*1024] --blocksize=$[16*1024] --random --open-au-nr=6 8MiB 32.3M/s 4MiB 22.5M/s 2MiB 11.6M/s 1MiB 6.96M/s 512KiB 4.93M/s 256KiB 5.28M/s 128KiB 3.38M/s 64KiB 2.85M/s 32KiB 2.03M/s 16KiB 936K/s # So random isn't a strong point compared to linear access. [andrew@mythdvr flashbench]$ sudo ./flashbench /dev/sdb --findfat --erasesize=$[8*1024*1024] --blocksize=4096 8MiB 33.2M/s 32.7M/s 33.1M/s 32.7M/s 33.1M/s 33.2M/s 4MiB 33M/s 32.9M/s 32.8M/s 32.6M/s 32.8M/s 32.7M/s 2MiB 32.7M/s 32.5M/s 32.7M/s 32.6M/s 32.8M/s 32.6M/s 1MiB 33.2M/s 33.1M/s 33.1M/s 33.2M/s 33.2M/s 33.2M/s 512KiB 32.2M/s 32.2M/s 32.4M/s 32.1M/s 32.3M/s 32.3M/s 256KiB 30.8M/s 30.8M/s 30.8M/s 30.8M/s 30.7M/s 30.9M/s 128KiB 30.1M/s 30.3M/s 30.1M/s 30M/s 30.3M/s 30.3M/s 64KiB 32M/s 32M/s 32.1M/s 32M/s 32.1M/s 32M/s 32KiB 28.2M/s 28.2M/s 28.3M/s 28.3M/s 28.2M/s 28.6M/s 16KiB 21.4M/s 7.8M/s 6.07M/s 11.9M/s 8.91M/s 5.33M/s 8KiB 5.11M/s 6.85M/s 6.19M/s 5.73M/s 5.77M/s 6.38M/s 4KiB 4.97M/s 4.98M/s 5.06M/s 5.02M/s 4.96M/s 5.01M/s -Andrew

14 years, 1 month

Transcend Ultimate 32GB Class 10 microSDHC TS32GUSDHC10

by Victor

Hi! I've started using that great tool to figure out how I should partition some cards but I'm not sure how to continue after the first results I've got and I'd like some guidance. Also I'd like to know if the card reader can influence the results since I've tested with 2 different laptops internal SD card readers and noticed differences in the times. I also checked with 'dd' the speeds and found the writing speed limited up to less than 10 MiB/s and a reading speed limited up to 14 MiB/s or so with chunks of 32 kiB and 4 MiB. Eventually I checked on an Android phone and got the writing speed limited up to 11 MiB/s or so and the reading speed limited up to less than 20 MiB/s. To make sure I compiled flashbench to run on the phone and also found different times than on the laptops. # # Product Page # http://www.transcend-info.com/products/Catlist.asp?LangNo=0&modno=320 # # Details # $ head /sys/block/mmcblk0/device/* 2>/dev/null | grep -v ^$ ==> /sys/block/mmcblk0/device/block <== ==> /sys/block/mmcblk0/device/cid <== 1b534d30303030301078944a9000c100 ==> /sys/block/mmcblk0/device/csd <== 400e00325b590000e9e57f800a404000 ==> /sys/block/mmcblk0/device/date <== 01/2012 ==> /sys/block/mmcblk0/device/driver <== ==> /sys/block/mmcblk0/device/erase_size <== 512 ==> /sys/block/mmcblk0/device/fwrev <== 0x0 ==> /sys/block/mmcblk0/device/hwrev <== 0x1 ==> /sys/block/mmcblk0/device/manfid <== 0x00001b ==> /sys/block/mmcblk0/device/name <== 00000 ==> /sys/block/mmcblk0/device/oemid <== 0x534d ## i.e. "SM" ==> /sys/block/mmcblk0/device/power <== ==> /sys/block/mmcblk0/device/preferred_erase_size <== 4194304 ==> /sys/block/mmcblk0/device/scr <== 02b5800200000000 ==> /sys/block/mmcblk0/device/serial <== 0x78944a90 ==> /sys/block/mmcblk0/device/subsystem <== ==> /sys/block/mmcblk0/device/type <== SD ==> /sys/block/mmcblk0/device/uevent <== DRIVER=mmcblk MMC_TYPE=SD MMC_NAME=00000 MODALIAS=mmc:block # # Size # $ cat /sys/block/mmcblk0/device/block/mmcblk0/size 61315072 # # Factor # $ factor 61315072 61315072: 2 2 2 2 2 2 2 2 2 2 2 7 7 13 47 Does it mean that the erase block size could be 7 MiB? # # Guess erase block and page sizes # ## on Dell E6400 $ sudo ./flashbench -a /dev/mmcblk0 --blocksize=1024 align 8589934592 pre 198µs on 210µs post 199µs diff 11.3µs align 4294967296 pre 185µs on 202µs post 187µs diff 15.6µs align 2147483648 pre 184µs on 197µs post 184µs diff 12.9µs align 1073741824 pre 187µs on 202µs post 187µs diff 15.7µs align 536870912 pre 184µs on 197µs post 184µs diff 13.5µs align 268435456 pre 217µs on 234µs post 187µs diff 32.1µs align 134217728 pre 218µs on 247µs post 200µs diff 38.7µs align 67108864 pre 219µs on 251µs post 202µs diff 40.5µs align 33554432 pre 219µs on 267µs post 216µs diff 48.9µs align 16777216 pre 208µs on 256µs post 216µs diff 43.7µs align 8388608 pre 203µs on 242µs post 208µs diff 36.5µs align 4194304 pre 212µs on 260µs post 216µs diff 45.8µs align 2097152 pre 205µs on 242µs post 207µs diff 36.1µs align 1048576 pre 212µs on 257µs post 217µs diff 42.4µs align 524288 pre 203µs on 240µs post 206µs diff 36.1µs align 262144 pre 211µs on 257µs post 217µs diff 43.2µs align 131072 pre 205µs on 241µs post 207µs diff 35.5µs align 65536 pre 209µs on 257µs post 217µs diff 43.7µs align 32768 pre 201µs on 239µs post 207µs diff 35.3µs align 16384 pre 213µs on 235µs post 210µs diff 23.9µs ## align 8192 pre 211µs on 213µs post 214µs diff 868ns align 4096 pre 212µs on 212µs post 217µs diff -2843ns align 2048 pre 214µs on 212µs post 214µs diff -1985ns ## on Lenovo T400 $ sudo ./flashbench -a /dev/mmcblk0 --blocksize=1024 align 8589934592 pre 307µs on 737µs post 358µs diff 405µs align 4294967296 pre 283µs on 724µs post 348µs diff 409µs align 2147483648 pre 300µs on 712µs post 371µs diff 377µs align 1073741824 pre 331µs on 857µs post 353µs diff 515µs align 536870912 pre 340µs on 872µs post 354µs diff 525µs align 268435456 pre 342µs on 843µs post 359µs diff 493µs align 134217728 pre 292µs on 839µs post 364µs diff 511µs align 67108864 pre 316µs on 843µs post 357µs diff 507µs align 33554432 pre 344µs on 832µs post 367µs diff 476µs align 16777216 pre 323µs on 862µs post 370µs diff 515µs align 8388608 pre 324µs on 855µs post 365µs diff 510µs align 4194304 pre 308µs on 772µs post 340µs diff 448µs align 2097152 pre 334µs on 861µs post 367µs diff 510µs align 1048576 pre 301µs on 794µs post 355µs diff 466µs align 524288 pre 325µs on 830µs post 352µs diff 492µs align 262144 pre 319µs on 795µs post 353µs diff 459µs align 131072 pre 314µs on 863µs post 389µs diff 511µs align 65536 pre 317µs on 813µs post 339µs diff 485µs align 32768 pre 311µs on 845µs post 364µs diff 507µs ## align 16384 pre 323µs on 464µs post 346µs diff 130µs ## align 8192 pre 331µs on 338µs post 330µs diff 7.52µs align 4096 pre 350µs on 357µs post 344µs diff 10.1µs align 2048 pre 359µs on 354µs post 352µs diff -1566ns ## on Samsung GT-I8150 # ./flashbench -a /dev/block/mmcblk1 --blocksize=1024 align 8589934592 pre 222µs on 318µs post 283µs diff 65.4µs align 4294967296 pre 227µs on 318µs post 279µs diff 65.4µs align 2147483648 pre 231µs on 318µs post 275µs diff 65.4µs align 1073741824 pre 279µs on 440µs post 405µs diff 98.1µs align 536870912 pre 231µs on 340µs post 371µs diff 39.2µs align 268435456 pre 240µs on 353µs post 288µs diff 89.4µs align 134217728 pre 253µs on 506µs post 344µs diff 207µs align 67108864 pre 231µs on 458µs post 292µs diff 196µs align 33554432 pre 257µs on 475µs post 305µs diff 194µs align 16777216 pre 235µs on 475µs post 318µs diff 198µs align 8388608 pre 218µs on 453µs post 310µs diff 190µs align 4194304 pre 248µs on 458µs post 296µs diff 185µs align 2097152 pre 231µs on 445µs post 296µs diff 181µs align 1048576 pre 244µs on 501µs post 327µs diff 216µs align 524288 pre 240µs on 449µs post 301µs diff 179µs align 262144 pre 231µs on 453µs post 310µs diff 183µs align 131072 pre 227µs on 453µs post 301µs diff 190µs align 65536 pre 253µs on 453µs post 310µs diff 172µs align 32768 pre 244µs on 453µs post 327µs diff 168µs ## align 16384 pre 253µs on 371µs post 318µs diff 85µs ## align 8192 pre 283µs on 257µs post 240µs diff -4359ns align 4096 pre 270µs on 262µs post 253µs diff 1ns align 2048 pre 275µs on 275µs post 275µs diff 0ns Should I understand that it has 16 kiB pages with multi-plane accesses to read two pages simultaneously? What do you suggest? How should I continue and with which device? Thanks and regards, Victor

14 years, 1 month

July USB

by Cngking

To ensure delivery of these Emails to your inbox, please add gwenzhan(a)gk-ing.com to your email address book. Dear Friend : Long time no contact ,how are you?Time flies,next We will be in "July of 2012".Our colleague Hillary Wu already back to Hometown for wedding,Cheers.Next i will be in charge for her job.pls noted. Do you have this kind of situation?want to buy Usb flash,but too many choices let you lost your judgement.after read below maybe you will know Why buy from us ? Any question pls feel free to let me know. Regards/Gwen G&K.Ing "We make miracle" ? Add:Rm 703.KingLihua Commercial Building,YiYuan Road,Bao"an ,ShenZhen,China Tel: 86(0)755 22208877 Fax:86(0)755 22141877 Mobile:86-13714133320 E-mail:gwenzhan@gk-ing.com,MSN:gwenzhan@hotmail.com,Website: www.gk-ing.com If you don't want to receive these Emails, please click unsubscribe.

14 years, 1 month

flashbench read test of Sandisk 16GB Extreme SDHC card

by Omega Weapon

As requested in the readme, I have used flashbench to test the card in the topic. Here are my results, taken by a Debian Wheezy install (Linux omega1 3.2.0-2-amd64 #1 SMP Mon Jun 11 17:24:18 UTC 2012 x86_64 GNU/Linux) on a Transcend 3.0 USB reader running through a USB2 port: sudo ./flashbench -a /dev/sdm --blocksize=1024 align 4294967296 pre 1.22ms on 1.42ms post 1.21ms diff 197µs align 2147483648 pre 1.21ms on 1.49ms post 1.04ms diff 367µs align 1073741824 pre 1.12ms on 1.41ms post 1.07ms diff 319µs align 536870912 pre 1.19ms on 1.44ms post 1.03ms diff 330µs align 268435456 pre 1.22ms on 1.44ms post 1.17ms diff 243µs align 134217728 pre 1.19ms on 1.46ms post 1.02ms diff 354µs align 67108864 pre 1.18ms on 1.44ms post 1.24ms diff 233µs align 33554432 pre 1.19ms on 1.4ms post 1.23ms diff 187µs align 16777216 pre 1.18ms on 1.43ms post 1.21ms diff 240µs align 8388608 pre 1.14ms on 1.46ms post 1.21ms diff 280µs align 4194304 pre 951µs on 1.12ms post 920µs diff 179µs align 2097152 pre 981µs on 1.07ms post 993µs diff 78.1µs align 1048576 pre 993µs on 1.09ms post 1.01ms diff 93.8µs align 524288 pre 996µs on 1.09ms post 1.01ms diff 86.5µs align 262144 pre 987µs on 1.09ms post 1ms diff 97.6µs align 131072 pre 977µs on 1.09ms post 1ms diff 102µs align 65536 pre 1.05ms on 1.1ms post 982µs diff 89.3µs align 32768 pre 1.03ms on 1.07ms post 1.07ms diff 24.7µs align 16384 pre 1.01ms on 1.08ms post 1.02ms diff 66.6µs align 8192 pre 1ms on 1.08ms post 1.01ms diff 68.3µs align 4096 pre 994µs on 1.07ms post 1.02ms diff 56.4µs align 2048 pre 1.02ms on 1.08ms post 1.02ms diff 58.7µs

14 years, 1 month

Sandisk Extreme 45MB/s 16GB UHS-1 SDHC

by Arnd Bergmann

==> /sys/block/mmcblk0/device/cid <== 03534453553136478000c1eec400c300 ==> /sys/block/mmcblk0/device/csd <== 400e00325b59000076b27f800a404000 ==> /sys/block/mmcblk0/device/date <== 03/2012 ==> /sys/block/mmcblk0/device/driver <== head: error reading `/sys/block/mmcblk0/device/driver': Is a directory ==> /sys/block/mmcblk0/device/erase_size <== 512 ==> /sys/block/mmcblk0/device/fwrev <== 0x0 ==> /sys/block/mmcblk0/device/hwrev <== 0x8 ==> /sys/block/mmcblk0/device/manfid <== 0x000003 ==> /sys/block/mmcblk0/device/name <== SU16G ==> /sys/block/mmcblk0/device/oemid <== 0x5344 ==> /sys/block/mmcblk0/device/power <== head: error reading `/sys/block/mmcblk0/device/power': Is a directory ==> /sys/block/mmcblk0/device/preferred_erase_size <== 4194304 ==> /sys/block/mmcblk0/device/scr <== 0235800300000000 ==> /sys/block/mmcblk0/device/serial <== 0x00c1eec4 ==> /sys/block/mmcblk0/device/subsystem <== head: error reading `/sys/block/mmcblk0/device/subsystem': Is a directory ==> /sys/block/mmcblk0/device/type <== SD ==> /sys/block/mmcblk0/device/uevent <== DRIVER=mmcblk MMC_TYPE=SD MMC_NAME=SU16G MODALIAS=mmc:block Disk /dev/mmcblk0: 15.9 GB, 15931539456 bytes 255 heads, 63 sectors/track, 1936 cylinders, total 31116288 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/mmcblk0p1 8192 31116287 15554048 c W95 FAT32 (LBA) $ sudo ./flashbench -a /dev/mmcblk0 --blocksize=1024 align 1610612736 pre 576µs on 683µs post 574µs diff 108µs align 1073741824 pre 574µs on 689µs post 568µs diff 118µs align 805306368 pre 578µs on 698µs post 575µs diff 121µs align 536870912 pre 570µs on 715µs post 564µs diff 148µs align 402653184 pre 578µs on 720µs post 573µs diff 145µs align 268435456 pre 573µs on 669µs post 568µs diff 97.9µs align 201326592 pre 582µs on 715µs post 577µs diff 135µs align 134217728 pre 581µs on 695µs post 576µs diff 116µs align 100663296 pre 570µs on 664µs post 565µs diff 96.5µs align 67108864 pre 572µs on 689µs post 569µs diff 118µs align 50331648 pre 568µs on 678µs post 569µs diff 109µs align 33554432 pre 581µs on 694µs post 578µs diff 114µs align 25165824 pre 549µs on 688µs post 562µs diff 132µs align 16777216 pre 569µs on 666µs post 554µs diff 105µs align 12582912 pre 579µs on 578µs post 576µs diff 618ns align 8388608 pre 574µs on 704µs post 569µs diff 133µs align 6291456 pre 573µs on 593µs post 572µs diff 20.7µs align 4194304 pre 581µs on 607µs post 571µs diff 30.5µs align 3145728 pre 571µs on 579µs post 576µs diff 5.44µs align 2097152 pre 580µs on 583µs post 580µs diff 3.2µs align 1572864 pre 574µs on 578µs post 575µs diff 3.63µs align 1048576 pre 582µs on 585µs post 579µs diff 4.77µs align 786432 pre 571µs on 577µs post 569µs diff 6.89µs align 524288 pre 573µs on 575µs post 572µs diff 2.2µs align 393216 pre 578µs on 581µs post 582µs diff 1.3µs align 262144 pre 574µs on 578µs post 570µs diff 6.3µs align 196608 pre 578µs on 578µs post 569µs diff 4.91µs align 131072 pre 572µs on 581µs post 574µs diff 7.64µs align 98304 pre 572µs on 574µs post 568µs diff 3.45µs align 65536 pre 571µs on 578µs post 567µs diff 9.32µs align 49152 pre 580µs on 579µs post 580µs diff -702ns align 32768 pre 569µs on 571µs post 568µs diff 1.98µs align 24576 pre 571µs on 569µs post 567µs diff -536ns align 16384 pre 568µs on 570µs post 570µs diff 696ns align 12288 pre 571µs on 569µs post 566µs diff 728ns align 8192 pre 566µs on 567µs post 569µs diff -846ns align 6144 pre 565µs on 566µs post 563µs diff 1.7µs align 4096 pre 573µs on 578µs post 574µs diff 4.31µs align 3072 pre 569µs on 568µs post 565µs diff 725ns align 2048 pre 572µs on 570µs post 573µs diff -2032ns $ sudo ./flashbench --open-au --erasesize=$[8*1024*1024] /dev/mmcblk0 --ocksize=1024 --open-au-nr=9 8MiB 11.9M/s 4MiB 11.9M/s 2MiB 11.8M/s 1MiB 11.8M/s 512KiB 11.8M/s 256KiB 11.7M/s 128KiB 11.5M/s 64KiB 11.2M/s 32KiB 8.73M/s 16KiB 6.07M/s 8KiB 3.54M/s 4KiB 2.08M/s 2KiB 1.01M/s 1KiB 517K/s sudo ./flashbench --open-au --erasesize=$[8*1024*1024] /dev/mmcblk0 --blocksize=1024 --open-au-nr=10 8MiB 11.9M/s 4MiB 9.3M/s 2MiB 5.01M/s 1MiB 2.69M/s $ sudo ./flashbench --open-au --erasesize=$[8*1024*1024] /dev/mmcblk0 --ocksize=1024 --open-au-nr=1 --random 8MiB 8.13M/s 4MiB 7.72M/s 2MiB 4.87M/s 1MiB 2.57M/s 512KiB 1.29M/s 256KiB 639K/s $ sudo ./flashbench --open-au --erasesize=$[8*1024*1024] /dev/mmcblk0 --ocksize=1024 --open-au-nr=1 --random 8MiB 8.13M/s 4MiB 7.72M/s 2MiB 4.87M/s 1MiB 2.57M/s 512KiB 1.29M/s 256KiB 639K/s 128KiB 602K/s 64KiB 513K/s 32KiB 2.44M/s 16KiB 3.39M/s 8KiB 1.75M/s 4KiB 893K/s 2KiB 425K/s 1KiB 222K/s arnd@klappe2:~/git/flashbench$ sudo ./flashbench --findfat --erasesize=$[2*1024*1024] /dev/mmcblk0 --ocksize=4096 --fat-nr=8 --random 2MiB 11.7M/s 11.9M/s 6.45M/s 7.19M/s 11.9M/s 12M/s 12M/s 11.9M/s 1MiB 3.38M/s 2.4M/s 2.02M/s 3.55M/s 5.74M/s 2.21M/s 2.66M/s 2.42M/s 512KiB 1.32M/s 1.16M/s 1.55M/s 3.9M/s 1.2M/s 1.2M/s 1.2M/s 1.19M/s 256KiB 1.32M/s 536K/s 1.98M/s 3.66M/s 692K/s 534K/s 532K/s 533K/s 128KiB 1.08M/s 770K/s 1.56M/s 5.08M/s 698K/s 773K/s 666K/s 665K/s 64KiB 1.25M/s 582K/s 2.36M/s 3.41M/s 568K/s 586K/s 586K/s 586K/s 32KiB 1.58M/s 953K/s 2.42M/s 4.28M/s 1.02M/s 1.03M/s 961K/s 960K/s 16KiB 2.27M/s 3.32M/s 3.3M/s 4.84M/s 1.41M/s 1.61M/s 1.91M/s 1.91M/s 8KiB 1.72M/s 1.87M/s 2.19M/s 1.49M/s 2M/s 2.01M/s 1.86M/s 1.83M/s 4KiB 796K/s 960K/s 576K/s 758K/s 1.04M/s 863K/s 861K/s 1.07M/s

14 years, 1 month

Toshiba 8 GB microSDHC Class 4

by Arnd Bergmann

Very surprisingly, this card with a Toshiba controller actually has 3 writeable erase blocks, not just one, and supports random access. ==> /sys/block/mmcblk0/device/block <== head: error reading `/sys/block/mmcblk0/device/block': Is a directory ==> /sys/block/mmcblk0/device/cid <== 02544d53413038471028cc2d7f00c200 ==> /sys/block/mmcblk0/device/csd <== 400e00325b5900003a477f800a400000 ==> /sys/block/mmcblk0/device/date <== 02/2012 ==> /sys/block/mmcblk0/device/driver <== head: error reading `/sys/block/mmcblk0/device/driver': Is a directory ==> /sys/block/mmcblk0/device/erase_size <== 512 ==> /sys/block/mmcblk0/device/fwrev <== 0x0 ==> /sys/block/mmcblk0/device/hwrev <== 0x1 ==> /sys/block/mmcblk0/device/manfid <== 0x000002 ==> /sys/block/mmcblk0/device/name <== SA08G ==> /sys/block/mmcblk0/device/oemid <== 0x544d ==> /sys/block/mmcblk0/device/power <== head: error reading `/sys/block/mmcblk0/device/power': Is a directory ==> /sys/block/mmcblk0/device/preferred_erase_size <== 4194304 ==> /sys/block/mmcblk0/device/scr <== 0235800001000000 ==> /sys/block/mmcblk0/device/serial <== 0x28cc2d7f ==> /sys/block/mmcblk0/device/subsystem <== head: error reading `/sys/block/mmcblk0/device/subsystem': Is a directory ==> /sys/block/mmcblk0/device/type <== SD ==> /sys/block/mmcblk0/device/uevent <== DRIVER=mmcblk MMC_TYPE=SD MMC_NAME=SA08G MODALIAS=mmc:block ==> /proc/partitions <== 179 0 7639040 mmcblk0 179 1 7634944 mmcblk0p1 align 100663296 pre 545µs on 852µs post 734µs diff 213µs align 67108864 pre 545µs on 854µs post 734µs diff 215µs align 50331648 pre 543µs on 851µs post 732µs diff 213µs align 33554432 pre 543µs on 853µs post 735µs diff 214µs align 25165824 pre 545µs on 855µs post 733µs diff 217µs align 16777216 pre 547µs on 856µs post 740µs diff 212µs align 12582912 pre 543µs on 854µs post 736µs diff 214µs align 8388608 pre 542µs on 860µs post 751µs diff 214µs align 6291456 pre 541µs on 723µs post 731µs diff 86.7µs align 4194304 pre 550µs on 858µs post 741µs diff 213µs align 3145728 pre 545µs on 741µs post 732µs diff 103µs align 2097152 pre 529µs on 714µs post 718µs diff 89.9µs align 1572864 pre 529µs on 716µs post 720µs diff 91.5µs align 1048576 pre 545µs on 746µs post 733µs diff 107µs align 786432 pre 549µs on 748µs post 735µs diff 106µs align 524288 pre 548µs on 744µs post 732µs diff 104µs align 393216 pre 552µs on 748µs post 739µs diff 103µs align 262144 pre 548µs on 745µs post 741µs diff 101 align 196608 pre 549µs on 745µs post 738µs diff 101µs align 131072 pre 553µs on 749µs post 740µs diff 103µs align 98304 pre 546µs on 747µs post 735µs diff 107µs $ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=1024 --erasesize=$[8*1024*1024] 8MiB 4.96M/s 4MiB 5.02M/s 2MiB 5.31M/s 1MiB 5M/s 512KiB 5M/s 256KiB 5M/s 128KiB 4.98M/s 64KiB 4.96M/s 32KiB 4.89M/s 16KiB 3.74M/s 8KiB 2.42M/s 4KiB 1.46M/s 2KiB 809K/s 1KiB 431K/s $ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=8192 --erasesize=$[8*1024*1024] --open-au-nr=2 8MiB 5.54M/s 4MiB 5.01M/s 2MiB 5.03M/s 1MiB 5.03M/s 512KiB 5.01M/s 256KiB 5.02M/s 128KiB 5.01M/s 64KiB 4.96M/s 32KiB 4.9M/s 16KiB 3.82M/s 8KiB 2.42M/s $ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=8192 --erasesize=$[4*1024*1024] --open-au-nr=2 4MiB 4.15M/s 2MiB 4.64M/s 1MiB 4.61M/s 512KiB 4.65M/s 256KiB 4.65M/s 128KiB 4.65M/s 64KiB 4.6M/s 32KiB 4.44M/s 16KiB 3.39M/s 8KiB 2.24M/s $ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=8192 --erasesize=$[4*1024*1024] --open-au-nr=2 --offset=$[17*1024*1024] 4MiB 3.6M/s 2MiB 2.27M/s 1MiB 2.72M/s 512KiB 3.03M/s $ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=8192 --erasesize=$[4*1024*1024] --open-au-nr=2 --offset=$[18*1024*1024] 4MiB 2.21M/s 2MiB 2.1M/s 1MiB 1.98M/s $ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=8192 --erasesize=$[4*1024*1024] --open-au-nr=2 --random 4MiB 5.03M/s 2MiB 2.69M/s 1MiB 3.15M/s 512KiB 1.43M/s 256KiB 1.75M/s 128KiB 1.89M/s 64KiB 1.37M/s 32KiB 1.2M/s 16KiB 1.19M/s 8KiB 613K/s $ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=8192 --erasesize=$[4*1024*1024] --open-au-nr=4 4MiB 3.23M/s 2MiB 4.27M/s 1MiB 1.45M/s 512KiB 628K/s ^Carnd@klappe2:~/git/flashbench$ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=8192 --erasesize=$[4*1024*1024] --open-au-nr=3 4MiB 3M/s 2MiB 4.58M/s 1MiB 4.57M/s 512KiB 4.55M/s 256KiB 4.57M/s 128KiB 4.54M/s 64KiB 4.52M/s 32KiB 4.37M/s 16KiB 3.34M/s 8KiB 2.2M/s $ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=8192 --erasesize=$[4*1024*1024] --open-au-nr=1 --random 4MiB 6.57M/s 2MiB 1.9M/s 1MiB 1.99M/s 512KiB 1.73M/s 256KiB 1.82M/s 128KiB 1.37M/s 64KiB 1.4M/s 32KiB 1.33M/s 16KiB 1.2M/s 8KiB 602K/s $ sudo ./flashbench --open-au /dev/mmcblk0 --blocksize=8192 --erasesize=$[4*1024*1024] --open-au-nr=3 --random 4MiB 6.27M/s 2MiB 3.31M/s 1MiB 3.14M/s 512KiB 1.43M/s 256KiB 1.76M/s 128KiB 1.89M/s 64KiB 1.37M/s 32KiB 1.2M/s $ sudo ./flashbench --findfat --fat-nr=6 /dev/mmcblk0 --blocksize=8192 --erasesize=$[4*1024*1024] --open-au-nr=1 --random 4MiB 752K/s 4.9M/s 2.86M/s 5M/s 5.01M/s 4.93M/s 2MiB 4.54M/s 4.53M/s 3.3M/s 2.19M/s 2.19M/s 2.32M/s 1MiB 4.03M/s 4.19M/s 2.33M/s 2.34M/s 2.34M/s 2.24M/s 512KiB 4.32M/s 4.17M/s 1.38M/s 1.38M/s 1.38M/s 1.38M/s

14 years, 1 month

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

Flashbench-results June 2012