Hello
I found very interesting your software and I did some tests with two
disks PNY SC1311 120GB and I found totally different values, I plotted
vs diff time and found kind an offset but still I cannot estimate the
erase block size.
I runned ./flashbench -a /dev/sda --blocksize=1024
align 17179869184 pre 99µs on 155µs post 94.1µs diff 58.2µs
align 8589934592 pre 127µs on 218µs post 130µs diff 89.4µs
align 4294967296 pre 109µs on 179µs post 108µs diff 70.3µs
align 2147483648 pre 112µs on 182µs post 111µs diff 70µs
align 1073741824 pre 122µs on 210µs post 135µs diff 81.9µs
align 536870912 pre 134µs on 186µs post 130µs diff 53.5µs
align 268435456 pre 122µs on 206µs post 122µs diff 84µs
align 134217728 pre 36.3µs on 43.4µs post 37.1µs diff 6.67µs
align 67108864 pre 36µs on 43.4µs post 37.1µs diff 6.9µs
align 33554432 pre 145µs on 246µs post 144µs diff 101µs
align 16777216 pre 147µs on 267µs post 147µs diff 120µs
align 8388608 pre 149µs on 270µs post 148µs diff 121µs
align 4194304 pre 137µs on 231µs post 135µs diff 95.4µs
align 2097152 pre 148µs on 249µs post 152µs diff 99.7µs
align 1048576 pre 116µs on 183µs post 134µs diff 58µs
align 524288 pre 113µs on 182µs post 113µs diff 68.8µs
align 262144 pre 112µs on 139µs post 117µs diff 24.3µs
align 131072 pre 117µs on 139µs post 117µs diff 21.2µs
align 65536 pre 117µs on 136µs post 117µs diff 19.7µs
align 32768 pre 109µs on 130µs post 109µs diff 21.3µs
align 16384 pre 109µs on 130µs post 108µs diff 21.6µs
align 8192 pre 108µs on 128µs post 108µs diff 19.8µs
align 4096 pre 104µs on 129µs post 109µs diff 22.7µs
align 2048 pre 103µs on 104µs post 103µs diff 756ns
./flashbench -a /dev/sda --blocksize=1024
align 17179869184 pre 37.2µs on 43.6µs post 37.3µs diff 6.39µs
align 8589934592 pre 50.9µs on 71.5µs post 50.9µs diff 20.6µs
align 4294967296 pre 36.6µs on 43.6µs post 37.2µs diff 6.72µs
align 2147483648 pre 37.1µs on 43.6µs post 37.2µs diff 6.47µs
align 1073741824 pre 47.9µs on 69.2µs post 47.2µs diff 21.7µs
align 536870912 pre 37.3µs on 43.6µs post 37.3µs diff 6.32µs
align 268435456 pre 51.6µs on 73µs post 51.7µs diff 21.4µs
align 134217728 pre 37.3µs on 43.6µs post 37.3µs diff 6.29µs
align 67108864 pre 37.3µs on 43.6µs post 37.2µs diff 6.39µs
align 33554432 pre 51.8µs on 73.3µs post 51.7µs diff 21.5µs
align 16777216 pre 50.8µs on 71.3µs post 50.9µs diff 20.4µs
align 8388608 pre 51.6µs on 73.1µs post 51.5µs diff 21.6µs
align 4194304 pre 50.9µs on 71.4µs post 51.1µs diff 20.4µs
align 2097152 pre 51.5µs on 72.7µs post 51.5µs diff 21.2µs
align 1048576 pre 55.1µs on 79.5µs post 55.2µs diff 24.4µs
align 524288 pre 51.7µs on 72.8µs post 51.4µs diff 21.3µs
align 262144 pre 55.2µs on 64.2µs post 55.1µs diff 9.04µs
align 131072 pre 55.1µs on 64.3µs post 55.2µs diff 9.12µs
align 65536 pre 55.1µs on 64.4µs post 55.2µs diff 9.27µs
align 32768 pre 50.8µs on 60µs post 50.5µs diff 9.39µs
align 16384 pre 51.7µs on 60.8µs post 51.5µs diff 9.14µs
align 8192 pre 51.4µs on 60.7µs post 51.5µs diff 9.33µs
align 4096 pre 46.9µs on 60.6µs post 51.6µs diff 11.4µs
align 2048 pre 46.8µs on 47µs post 46.9µs diff 133ns
could you explain what is happening and how much is the erase block
size?
thanks in advance
Ray
Hello!
Please look at the result of this card below.
PN: MB-MC32G
Factory alignment 8 MiB.
8K sector and probably 4MiB erase size, however it's TLC.
########
Fdisk
Disk /dev/mmcblk1: 29.8 GiB, 32010928128 bytes, 62521344 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
Disklabel type: dos
Disk identifier: 0x00000000
Device Boot Start End Sectors Size Id Type
/dev/mmcblk1p1 8192 62521343 62513152 29.8G c W95 FAT32 (LBA)
########
flashbench
align 8589934592 pre 429µs on 553µs post 352µs diff 162µs
align 4294967296 pre 425µs on 552µs post 354µs diff 163µs
align 2147483648 pre 433µs on 552µs post 352µs diff 159µs
align 1073741824 pre 432µs on 554µs post 353µs diff 162µs
align 536870912 pre 429µs on 553µs post 353µs diff 162µs
align 268435456 pre 433µs on 554µs post 353µs diff 160µs
align 134217728 pre 433µs on 551µs post 354µs diff 158µs
align 67108864 pre 435µs on 552µs post 354µs diff 158µs
align 33554432 pre 436µs on 552µs post 353µs diff 158µs
align 16777216 pre 413µs on 582µs post 383µs diff 184µs
align 8388608 pre 420µs on 591µs post 366µs diff 198µs
align 4194304 pre 415µs on 555µs post 353µs diff 171µs
align 2097152 pre 405µs on 567µs post 387µs diff 170µs
align 1048576 pre 412µs on 574µs post 411µs diff 162µs
align 524288 pre 413µs on 566µs post 388µs diff 165µs
align 262144 pre 415µs on 569µs post 413µs diff 154µs
align 131072 pre 414µs on 561µs post 390µs diff 159µs
align 65536 pre 408µs on 608µs post 371µs diff 218µs
align 32768 pre 412µs on 590µs post 367µs diff 200µs
align 16384 pre 430µs on 538µs post 355µs diff 145µs
align 8192 pre 380µs on 379µs post 349µs diff 14.4µs
align 4096 pre 380µs on 384µs post 348µs diff 19.9µs
align 2048 pre 387µs on 385µs post 383µs diff 134ns
########
device parameters
/sys/block/mmcblk1/device/cid:1b534d454231515430416653ef012311
/sys/block/mmcblk1/device/csd:400e00325b590000ee7f7f800a404055
/sys/block/mmcblk1/device/date:03/2018
/sys/block/mmcblk1/device/erase_size:512
/sys/block/mmcblk1/device/fwrev:0x0
/sys/block/mmcblk1/device/hwrev:0x3
/sys/block/mmcblk1/device/manfid:0x00001b
/sys/block/mmcblk1/device/name:EB1QT
/sys/block/mmcblk1/device/oemid:0x534d
/sys/block/mmcblk1/device/preferred_erase_size:4194304
/sys/block/mmcblk1/device/scr:02b5800200000000
/sys/block/mmcblk1/device/type:SD
/sys/block/mmcblk1/device/uevent:DRIVER=mmcblk
/sys/block/mmcblk1/device/uevent:MMC_TYPE=SD
/sys/block/mmcblk1/device/uevent:MMC_NAME=EB1QT
/sys/block/mmcblk1/device/uevent:MODALIAS=mmc:block
Best regards
Hello there!
PN: MMCGS64GSDSM-TO
Manufactured: 1808
fdisk -l /dev/sdc
Disk /dev/sdc: 60 GiB, 64424509440 bytes, 125829120 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
Disklabel type: dos
Disk identifier: 0x00000000
Eszköz Indítható Start Vége Szektorok Size Id Típus
/dev/sdc1 32768 125829119 125796352 60G 7 HPFS/NTFS/exFAT
tested on a orangepi
flashbench -a -b 1024 -c 128 /dev/mmcblk1
sched_setscheduler: Operation not permitted
align 17179869184 pre 1.21ms on 1.28ms post 1.11ms diff 125µs
align 8589934592 pre 1.14ms on 1.28ms post 1.1ms diff 157µs
align 4294967296 pre 1.21ms on 1.34ms post 881µs diff 290µs
align 2147483648 pre 1.18ms on 1.4ms post 870µs diff 373µs
align 1073741824 pre 979µs on 1.4ms post 1.03ms diff 400µs
align 536870912 pre 958µs on 1.25ms post 1.11ms diff 210µs
align 268435456 pre 889µs on 1.24ms post 1.11ms diff 243µs
align 134217728 pre 962µs on 1.11ms post 1.11ms diff 69µs
align 67108864 pre 1.02ms on 1.1ms post 1.12ms diff 28.7µs
align 33554432 pre 1.02ms on 1.1ms post 1.14ms diff 20.1µs
align 16777216 pre 1.02ms on 1.25ms post 938µs diff 275µs
align 8388608 pre 1.02ms on 1.25ms post 893µs diff 288µs
align 4194304 pre 940µs on 1.16ms post 1.06ms diff 158µs
align 2097152 pre 945µs on 1.18ms post 1.04ms diff 187µs
align 1048576 pre 949µs on 1.17ms post 1.1ms diff 141µs
align 524288 pre 949µs on 1.17ms post 1.03ms diff 179µs
align 262144 pre 951µs on 1.16ms post 1.04ms diff 164µs
align 131072 pre 1.03ms on 1.17ms post 1.04ms diff 132µs
align 65536 pre 940µs on 1.17ms post 1.03ms diff 184µs
align 32768 pre 946µs on 1.17ms post 1.03ms diff 183µs
align 16384 pre 953µs on 1.24ms post 1.08ms diff 219µs
align 8192 pre 944µs on 934µs post 935µs diff -5440ns
align 4096 pre 958µs on 964µs post 949µs diff 10.2µs
align 2048 pre 982µs on 986µs post 981µs diff 4.08µs
Probably 8K block and 16MB erase size.
Balazs
Hi,
My research subject is NAND non-volatile memory and need some help.
I have beaglebone board with emmc memory and orangepi with nand memory.
I'm currently spend time on MTD utils, as i study, i should use MTD API because i want to write/read specific page with ECC?
now i'm confusing in writing driver according to:
http://www.linux-mtd.infradead.org/archive/tech/
could you help please?
Thanks
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