Flashbench-results October 2011

flashbench-results@lists.linaro.org

1 participants
4 discussions

by Philippe De Muyter

Hello Arnd, Here are the results for the Kingston CF 2GB (Assy in TAIWAN). The one marked with (Assy in Japan) have another size, and probabbly other characteristics. Could the size be related to the number of open-au's ? Philippe tmp179:~ # cat /proc/partitions major minor #blocks name 8 0 244198584 sda 8 1 2103296 sda1 8 2 20972544 sda2 8 16 1982232 sdb 8 17 1975963 sdb1 tmp179:~ # ./flashbench -a -b 1024 /dev/sdb sched_setscheduler: Operation not permitted align 67108864 pre 343µs on 370µs post 321µs diff 37.5µs align 33554432 pre 342µs on 367µs post 319µs diff 36.5µs align 16777216 pre 342µs on 368µs post 320µs diff 36.5µs align 8388608 pre 343µs on 368µs post 318µs diff 37.1µs align 4194304 pre 342µs on 368µs post 319µs diff 37.1µs align 2097152 pre 343µs on 368µs post 319µs diff 37µs align 1048576 pre 344µs on 370µs post 320µs diff 38.3µs align 524288 pre 322µs on 350µs post 344µs diff 17.1µs align 262144 pre 320µs on 349µs post 344µs diff 16.8µs align 131072 pre 321µs on 349µs post 344µs diff 16.9µs align 65536 pre 321µs on 350µs post 344µs diff 17.2µs align 32768 pre 323µs on 351µs post 344µs diff 18µs align 16384 pre 320µs on 326µs post 321µs diff 5.4µs align 8192 pre 321µs on 325µs post 320µs diff 5µs align 4096 pre 320µs on 326µs post 321µs diff 5.6µs align 2048 pre 320µs on 325µs post 321µs diff 4.85µs tmp179:~ # hdparm -i /dev/sdb /dev/sdb: Model=CF CARD 2GB, FwRev=20071116, SerialNo=CF 2GB 20051F71 Config={ HardSect NotMFM Fixed DTR>10Mbs } RawCHS=3933/16/63, TrkSize=0, SectSize=576, ECCbytes=4 BuffType=DualPort, BuffSize=1kB, MaxMultSect=1, MultSect=off CurCHS=3933/16/63, CurSects=3964464, LBA=yes, LBAsects=3964464 IORDY=no, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120} PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: *mdma0 mdma1 mdma2 AdvancedPM=no * signifies the current active mode tmp179:~ # for i in `seq 1 10`; do echo $i; ./flashbench --open-au --open-au-nr=$i --erasesize=$[1024 * 1024] --blocksize=16384 /dev/sdb; done 1 sched_setscheduler: Operation not permitted 1MiB 11M/s 512KiB 11.1M/s 256KiB 11M/s 128KiB 11M/s 64KiB 10.7M/s 32KiB 10M/s 16KiB 8.83M/s 2 sched_setscheduler: Operation not permitted 1MiB 11.1M/s 512KiB 11.1M/s 256KiB 11.1M/s 128KiB 11.1M/s 64KiB 10.7M/s 32KiB 10.1M/s 16KiB 8.87M/s 3 sched_setscheduler: Operation not permitted 1MiB 11.1M/s 512KiB 11.1M/s 256KiB 11.1M/s 128KiB 11.1M/s 64KiB 10.8M/s 32KiB 10.1M/s 16KiB 8.85M/s 4 sched_setscheduler: Operation not permitted 1MiB 11.1M/s 512KiB 8.32M/s 256KiB 4.56M/s 128KiB 2.39M/s ^C tmp179:~ # for i in `seq 1 10`; do echo $i; ./flashbench --open-au --open-au-nr=$i --erasesize=$[1024 * 1024] --blocksize=16384 /dev/sdb --random; done 1 sched_setscheduler: Operation not permitted 1MiB 11.1M/s 512KiB 11.1M/s 256KiB 7.38M/s 128KiB 6.18M/s 64KiB 6.12M/s 32KiB 6.47M/s 16KiB 7.04M/s 2 sched_setscheduler: Operation not permitted 1MiB 7.37M/s 512KiB 8.05M/s 256KiB 6.72M/s 128KiB 6.4M/s 64KiB 6.53M/s 32KiB 6.55M/s 16KiB 7.04M/s 3 sched_setscheduler: Operation not permitted 1MiB 8.66M/s 512KiB 9.11M/s 256KiB 6.79M/s 128KiB 5.55M/s 64KiB 4.24M/s 32KiB 4.05M/s 16KiB 3.92M/s 4 sched_setscheduler: Operation not permitted 1MiB 9.37M/s 512KiB 9.67M/s 256KiB 6.73M/s 128KiB 4.79M/s 64KiB 3.32M/s 32KiB 3.07M/s 16KiB 3.52M/s 5 sched_setscheduler: Operation not permitted 1MiB 9.8M/s 512KiB 7.8M/s 256KiB 4.75M/s 128KiB 4.21M/s 64KiB 2.99M/s 32KiB 2.46M/s 16KiB 2.75M/s 6 sched_setscheduler: Operation not permitted 1MiB 11.4M/s 512KiB 7.1M/s 256KiB 4.03M/s 128KiB 2.7M/s 64KiB 2.83M/s 32KiB 2.38M/s 16KiB 2.45M/s 7 sched_setscheduler: Operation not permitted 1MiB 11.4M/s 512KiB 6.71M/s 256KiB 3.73M/s 128KiB 2.43M/s 64KiB 2.49M/s 32KiB 2.07M/s 16KiB 2.11M/s 8 sched_setscheduler: Operation not permitted 1MiB 11.4M/s 512KiB 6.4M/s 256KiB 3.5M/s 128KiB 2.26M/s 64KiB 2.23M/s 32KiB 1.85M/s 16KiB 1.86M/s 9 sched_setscheduler: Operation not permitted 1MiB 11.4M/s 512KiB 6.18M/s 256KiB 3.33M/s 128KiB 2.1M/s 64KiB 2.04M/s 32KiB 1.65M/s 16KiB 1.66M/s 10 sched_setscheduler: Operation not permitted 1MiB 11.4M/s 512KiB 6M/s 256KiB 3.18M/s 128KiB 1.99M/s 64KiB 1.88M/s 32KiB 1.52M/s 16KiB 1.51M/s (reverse-i-search)`fat': ./flashbench --findfat --^Ct-nr=10 --erasesize=$[2 * 1024 * 1024] --blocksize=1024 /dev/sdb tmp179:~ # ./flashbench --findfat --fat-nr=10 --erasesize=$[1024 * 1024] --blocksize=1024 /dev/sdb sched_setscheduler: Operation not permitted 1MiB 4.32M/s 11.4M/s 11.4M/s 11.4M/s 11.4M/s 11.2M/s 11.3M/s 11.4M/s 11.3M/s 11.4M/s 512KiB 11.3M/s 11.4M/s 11.1M/s 11.4M/s 11.4M/s 11.4M/s 11.4M/s 11.4M/s 11M/s 11.4M/s 256KiB 11.4M/s 11.4M/s 11.2M/s 11.2M/s 11.2M/s 11.2M/s 11.3M/s 11.4M/s 11.4M/s 11.3M/s 128KiB 11.3M/s 11.3M/s 11.2M/s 11.4M/s 11.4M/s 11.4M/s 11.4M/s 11.2M/s 11.3M/s 11.4M/s 64KiB 11M/s 11M/s 11M/s 11M/s 10.8M/s 11M/s 11M/s 11M/s 11M/s 11M/s 32KiB 9.98M/s 10.3M/s 10.3M/s 10.3M/s 10.2M/s 10.1M/s 10.2M/s 10.2M/s 10.2M/s 10.3M/s 16KiB 8.99M/s 9.01M/s 9.01M/s 8.99M/s 8.94M/s 9.02M/s 9.03M/s 9.03M/s 9.01M/s 8.95M/s 8KiB 7.2M/s 7.23M/s 7.23M/s 7.22M/s 7.21M/s 7.23M/s 7.13M/s 7.23M/s 7.23M/s 7.22M/s 4KiB 4.98M/s 4.97M/s 4.83M/s 4.97M/s 4.97M/s 4.97M/s 4.92M/s 4.91M/s 4.93M/s 4.93M/s 2KiB 3.04M/s 3.06M/s 3.05M/s 3.06M/s 3.05M/s 3.06M/s 3.03M/s 3.06M/s 3.06M/s 3.06M/s 1KiB 1.26M/s 1.26M/s 1.26M/s 1.26M/s 1.25M/s 1.26M/s 1.26M/s 1.24M/s 1.26M/s 1.25M/s tmp179:~ # ./flashbench --findfat --fat-nr=10 --erasesize=$[1024 * 1024] --blocksize=1024 /dev/sdb sched_setscheduler: Operation not permitted 1MiB 11.2M/s 11.4M/s 11.4M/s 11.3M/s 11.4M/s 11.4M/s 11.4M/s 11.3M/s 11.4M/s 11.4M/s 512KiB 11.4M/s 11.2M/s 11.4M/s 11.4M/s 11.4M/s 11.4M/s 11.4M/s 11.4M/s 11.2M/s 11.3M/s 256KiB 11M/s 11.4M/s 11.4M/s 11.3M/s 11.4M/s 11.3M/s 11.1M/s 11.4M/s 11.4M/s 11M/s 128KiB 11.4M/s 11.2M/s 11.3M/s 11.4M/s 11.4M/s 11.3M/s 11.4M/s 11.3M/s 11.4M/s 11.3M/s 64KiB 11M/s 11M/s 11M/s 10.9M/s 11M/s 11M/s 11M/s 11M/s 11M/s 11M/s 32KiB 10.1M/s 10.2M/s 10M/s 10.4M/s 10.3M/s 10.3M/s 10.3M/s 10.3M/s 10.1M/s 10.3M/s 16KiB 9.03M/s 8.82M/s 9.02M/s 8.93M/s 8.94M/s 9.01M/s 9.03M/s 9M/s 9.02M/s 9.01M/s 8KiB 7.24M/s 7.22M/s 7.23M/s 7.21M/s 7.22M/s 7.17M/s 7.24M/s 7.23M/s 7.22M/s 7.23M/s 4KiB 4.97M/s 4.98M/s 4.92M/s 4.93M/s 4.84M/s 4.99M/s 4.97M/s 4.96M/s 4.97M/s 4.96M/s 2KiB 3.01M/s 3.06M/s 3.06M/s 2.97M/s 3.05M/s 3.03M/s 3.03M/s 3.05M/s 3.06M/s 3.05M/s 1KiB 1.26M/s 1.26M/s 1.26M/s 1.26M/s 1.26M/s 1.26M/s 1.26M/s 1.25M/s 1.24M/s 1.26M/s tmp179:~ # -- Philippe De Muyter +32 2 6101532 Macq SA rue de l'Aeronef 2 B-1140 Bruxelles

14 years, 10 months

(fake) Sandisk

by Arnd Bergmann

arnd@klappe2:~/git/flashbench$ sudo fdisk -l /dev/mmcblk0 Disk /dev/mmcblk0: 2002 MB, 2002780160 bytes # 1,955,840 KB ==> /sys/block/mmcblk0/device/block <== ==> /sys/block/mmcblk0/device/cid <== 1b534d3030303030102a24f3f600b200 ==> /sys/block/mmcblk0/device/csd <== 007fff325b5a83baf6dbdfff0e800000 ==> /sys/block/mmcblk0/device/date <== 02/2011 ==> /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 # "SM" ==> /sys/block/mmcblk0/device/power <== ==> /sys/block/mmcblk0/device/preferred_erase_size <== 4194304 ==> /sys/block/mmcblk0/device/scr <== 0225800000000000 ==> /sys/block/mmcblk0/device/serial <== 0x2a24f3f6 ==> /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 # 1MB erase block!: align 6291456 pre 1.52ms on 3.95ms post 3.21ms diff 1.59ms align 4194304 pre 1.57ms on 4.01ms post 3.21ms diff 1.62ms align 3145728 pre 1.54ms on 3.82ms post 3.05ms diff 1.53ms align 2097152 pre 1.56ms on 3.83ms post 3.03ms diff 1.53ms align 1572864 pre 2.3ms on 2.69ms post 2.59ms diff 247µs align 1048576 pre 1.64ms on 4.12ms post 3.25ms diff 1.67ms align 786432 pre 2.05ms on 2.48ms post 2.34ms diff 283µs align 524288 pre 2.34ms on 2.77ms post 2.61ms diff 298µs align 393216 pre 2.54ms on 2.97ms post 2.79ms diff 306µs align 262144 pre 2.66ms on 3.09ms post 2.96ms diff 274µs arnd@klappe2:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --open-au-nr=2 --erasesize=$[4096 * 1024] --blocksize=4096 4MiB 4.78M/s 2MiB 6.4M/s 1MiB 6.45M/s 512KiB 6.32M/s 256KiB 6.47M/s 128KiB 6.43M/s 64KiB 6.31M/s 32KiB 5.34M/s 16KiB 3.96M/s 8KiB 1.09M/s arnd@klappe2:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --open-au-nr=2 --erasesize=$[4096 * 1024] --offset=$[2048*1024] --blocksize=4096 4MiB 4.88M/s 2MiB 6.43M/s 1MiB 6.35M/s 512KiB 6.33M/s 256KiB 6.44M/s 128KiB 6.4M/s 64KiB 5.25M/s 32KiB 5.33M/s 16KiB 3.91M/s 8KiB 2.32M/s arnd@klappe2:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --open-au-nr=2 --erasesize=$[4096 * 1024] --offset=$[33*512*1024] --blocksize=4096 4MiB 3.89M/s 2MiB 3.66M/s 1MiB 2.35M/s 512KiB 5M/s 256KiB 4M/s 128KiB 4.64M/s ^C arnd@klappe2:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --open-au-nr=1 --erasesize=$[1024 * 1024] --blocksize=4096 1MiB 5.39M/s 512KiB 1.6M/s 256KiB 1.52M/s 128KiB 2.28M/s 64KiB 6.41M/s 32KiB 5.27M/s 16KiB 3.99M/s 8KiB 2.88M/s 4KiB 527K/s arnd@klappe2:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --open-au-nr=2 --erasesize=$[4*1024 * 1024] --offset=$[34*512*1024] --blocksize=4096 4MiB 4.58M/s 2MiB 6.38M/s 1MiB 6.47M/s 512KiB 4.6M/s 256KiB 6.47M/s 128KiB 6.49M/s 64KiB 5.16M/s 32KiB 5.35M/s 16KiB 4.01M/s 8KiB 2.59M/s ^C # no random write: arnd@klappe2:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --open-au-nr=1 --erasesize=$[4*1024 * 1024] --offset=$[32*512*1024] --blocksize=4096 --random 4MiB 3M/s 2MiB 2.51M/s 1MiB 2.55M/s 512KiB 1.09M/s 256KiB 727K/s 128KiB 357K/s 64KiB 309K/s ^C

14 years, 11 months

Kingston 2GB microSD

by Arnd Bergmann

==> /sys/block/mmcblk0/device/block <== ==> /sys/block/mmcblk0/device/cid <== 02544d53413032470520cddb0600a900 ==> /sys/block/mmcblk0/device/csd <== 002e00325b5aa3acffffff800a800000 ==> /sys/block/mmcblk0/device/date <== 09/2010 ==> /sys/block/mmcblk0/device/driver <== ==> /sys/block/mmcblk0/device/erase_size <== 512 ==> /sys/block/mmcblk0/device/fwrev <== 0x5 ==> /sys/block/mmcblk0/device/hwrev <== 0x0 ==> /sys/block/mmcblk0/device/manfid <== 0x000002 ==> /sys/block/mmcblk0/device/name <== SA02G ==> /sys/block/mmcblk0/device/oemid <== 0x544d # "TM" -> Toshiba ==> /sys/block/mmcblk0/device/power <== ==> /sys/block/mmcblk0/device/preferred_erase_size <== 4194304 ==> /sys/block/mmcblk0/device/scr <== 0225800001000000 ==> /sys/block/mmcblk0/device/serial <== 0x20cddb06 ==> /sys/block/mmcblk0/device/subsystem <== ==> /sys/block/mmcblk0/device/type <== SD ==> /sys/block/mmcblk0/device/uevent <== DRIVER=mmcblk MMC_TYPE=SD MMC_NAME=SA02G MODALIAS=mmc:block arnd@klappe2:~/git/flashbench$ sudo fdisk -l /dev/mmcblk0 Disk /dev/mmcblk0: 1973 MB, 1973420032 bytes # 1,927,168KB # 2 MB erase block size: align 6291456 pre 1.81ms on 2.39ms post 1.31ms diff 834µs align 4194304 pre 2.07ms on 2.39ms post 1.31ms diff 702µs align 3145728 pre 1.33ms on 1.49ms post 1.32ms diff 162µs align 2097152 pre 2.03ms on 2.4ms post 1.3ms diff 729µs align 1572864 pre 1.34ms on 1.5ms post 1.33ms diff 162µs align 1048576 pre 1.41ms on 1.57ms post 1.33ms diff 195µs align 786432 pre 1.36ms on 1.52ms post 1.35ms diff 165µs #linear access, one erase block arnd@klappe2:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --open-au-nr=1 --blocksize=512 4MiB 5.49M/s 2MiB 4.07M/s 1MiB 4.1M/s 512KiB 4.12M/s 256KiB 4.13M/s 128KiB 5.77M/s 64KiB 9.5M/s 32KiB 8.54M/s 16KiB 6.48M/s 8KiB 3.94M/s 4KiB 1.28M/s 2KiB 543K/s 1KiB 2K/s # random access, one erase block: cannot do random access arnd@klappe2:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --open-au-nr=1 --random --blocksize=2048 4MiB 7.61M/s 2MiB 2.27M/s 1MiB 2.86M/s 512KiB 1.19M/s 256KiB 553K/s 128KiB 309K/s 64KiB 255K/s 32KiB 135K/s # linear access, two erase blocks: cannot be handled either: arnd@klappe2:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --open-au-nr=2 --blocksize=2048 4MiB 7.21M/s 2MiB 9.44M/s 1MiB 4.45M/s 512KiB 1.95M/s 256KiB 944K/s 128KiB 464K/s

14 years, 11 months

Transcend Class 10 micro 8GB

by Arnd Bergmann

arnd@klappe2:~/git/flashbench$ sudo head /sys/block/mmcblk0/device/* 2>/dev/null | grep -v ^$ ==> /sys/block/mmcblk0/device/block <== ==> /sys/block/mmcblk0/device/cid <== 744a4555534420201005402e0500b700 ==> /sys/block/mmcblk0/device/csd <== 400e00325b5900003bbd7f800a400000 ==> /sys/block/mmcblk0/device/date <== 07/2011 ==> /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 <== 0x000074 ==> /sys/block/mmcblk0/device/name <== USD ==> /sys/block/mmcblk0/device/oemid <== 0x4a45 # ==> "JE" ==> /sys/block/mmcblk0/device/power <== ==> /sys/block/mmcblk0/device/preferred_erase_size <== 4194304 ==> /sys/block/mmcblk0/device/scr <== 0235800000000000 ==> /sys/block/mmcblk0/device/serial <== 0x05402e05 ==> /sys/block/mmcblk0/device/subsystem <== ==> /sys/block/mmcblk0/device/type <== SD ==> /sys/block/mmcblk0/device/uevent <== DRIVER=mmcblk MMC_TYPE=SD MMC_NAME=USD MODALIAS=mmc:block arnd@klappe2:~/git/flashbench$ sudo fdisk -l /dev/mmcblk0 Disk /dev/mmcblk0: 8018 MB, 8018460672 bytes # > 7,830,528 KB arnd@klappe2:~/git/flashbench$ sudo ./flashbench -a /dev/mmcblk0 --blocksize=1024 align 12582912 pre 391µs on 729µs post 624µs diff 222µs align 8388608 pre 391µs on 741µs post 641µs diff 225µs align 6291456 pre 413µs on 697µs post 671µs diff 154µs align 4194304 pre 359µs on 741µs post 649µs diff 236µs align 3145728 pre 408µs on 701µs post 654µs diff 170µs align 2097152 pre 405µs on 700µs post 655µs diff 170µs align 1572864 pre 402µs on 701µs post 660µs diff 170µs # --> 4 MB erase block align 32768 pre 389µs on 678µs post 640µs diff 164µs align 24576 pre 386µs on 670µs post 641µs diff 157µs align 16384 pre 391µs on 680µs post 641µs diff 164µs align 12288 pre 535µs on 538µs post 496µs diff 22.9µs align 8192 pre 386µs on 676µs post 646µs diff 160µs align 6144 pre 460µs on 459µs post 422µs diff 17.8µs align 4096 pre 533µs on 532µs post 495µs diff 17.9µs # --> 8 KB page size # linear access in one 4MB erase block: arnd@klappe2:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --open-au-nr=1 4MiB 12M/s 2MiB 10.5M/s 1MiB 10.4M/s 512KiB 10.5M/s 256KiB 9.93M/s 128KiB 10.2M/s 64KiB 10.1M/s 32KiB 6.79M/s 16KiB 4.44M/s # random access, almost as fast: arnd@klappe2:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --open-au-nr=1 --random 4MiB 8.28M/s 2MiB 8.15M/s 1MiB 8.24M/s 512KiB 8.12M/s 256KiB 8.15M/s 128KiB 8.31M/s 64KiB 8.3M/s 32KiB 6.71M/s 16KiB 4.35M/s # across 4 erase blocks, still fast: arnd@klappe2:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --open-au-nr=4 --random 4MiB 10.9M/s 2MiB 7.1M/s 1MiB 9.77M/s 512KiB 9.71M/s 256KiB 9.65M/s 128KiB 9.45M/s 64KiB 9.37M/s 32KiB 6.5M/s 16KiB 4.2M/s # 8 erase blocks, very slow: arnd@klappe2:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --open-au-nr=8 --random 4MiB 9.39M/s 2MiB 3.57M/s 1MiB 2M/s ... # 6 erase blocks, very slow: arnd@klappe2:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --open-au-nr=6 --random 4MiB 9.38M/s 2MiB 4.47M/s 1MiB 2M/s ^C # 5 erase blocks, fast: arnd@klappe2:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --open-au-nr=5 --random 4MiB 8.7M/s 2MiB 10.5M/s 1MiB 10.4M/s 512KiB 10.4M/s 256KiB 10.3M/s 128KiB 10.2M/s 64KiB 9.99M/s 32KiB 6.44M/s 16KiB 4.2M/s # page size! 8KiB 1.62M/s 4KiB 803K/s 2KiB 396K/s 1KiB 189K/s 512B 97B/s # 5 erase blocks linear, same thing but slightly faster: arnd@klappe2:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --open-au-nr=5 --blocksize=512 4MiB 5.98M/s 2MiB 9.52M/s 1MiB 9.41M/s 512KiB 9.45M/s 256KiB 9.35M/s 128KiB 9.2M/s 64KiB 9.1M/s 32KiB 6.47M/s 16KiB 4.1M/s 8KiB 2.15M/s 4KiB 1.23M/s 2KiB 663K/s 1KiB 340K/s # 6 erase blocks linear, also slow: arnd@klappe2:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --open-au-nr=6 --blocksize=512 4MiB 8.79M/s 2MiB 3.62M/s 1MiB 1.94M/s ^C

14 years, 11 months

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Flashbench-results October 2011