[Flashbench] flashbench results for SanDisk 7761920 KB SDHC Class 2 MMC card

[Amit Pundir]

manfid = 0x000003
and, oemid = 0x5344

$ sudo ./flashbench -a /dev/mmcblk0 --blocksize=$[4 * 1024]
align 2147483648        pre 3.47ms      on 3.74ms       post 2.81ms
 diff 601µs
align 1073741824        pre 3.84ms      on 3.99ms       post 3.15ms
 diff 494µs
align 536870912 pre 3.95ms      on 4.05ms       post 3.46ms     diff 349µs
align 268435456 pre 3.42ms      on 3.68ms       post 3.2ms      diff 372µs
align 134217728 pre 2.86ms      on 3.13ms       post 2.72ms     diff 341µs
align 67108864  pre 2.93ms      on 3.35ms       post 2.84ms     diff 458µs
align 33554432  pre 3.9ms       on 4.34ms       post 3.82ms     diff 479µs
align 16777216  pre 2.96ms      on 3.23ms       post 2.26ms     diff 624µs
align 8388608   pre 2.06ms      on 2.66ms       post 2.22ms     diff 519µs
align 4194304   pre 2.98ms      on 3.31ms       post 2.23ms     diff 699µs
align 2097152   pre 4.21ms      on 4.5ms        post 3.86ms     diff 461µs
align 1048576   pre 4.38ms      on 4.63ms       post 3.95ms     diff 467µs
align 524288    pre 3.03ms      on 3.22ms       post 2.85ms     diff 280µs
align 262144    pre 2.76ms      on 2.98ms       post 2.45ms     diff 371µs
align 131072    pre 2.47ms      on 2.7ms        post 2.48ms     diff 228µs
align 65536     pre 2.58ms      on 2.97ms       post 2.46ms     diff 451µs
align 32768     pre 2.48ms      on 2.69ms       post 2.5ms      diff 194µs
align 16384     pre 3.09ms      on 3.28ms       post 2.7ms      diff 383µs
align 8192      pre 2.78ms      on 3.01ms       post 2.76ms     diff 238µs

Erase Block size assumed to be 4MB.

$ sudo ./flashbench -O --erasesize=$[4 * 1024 * 1024] --blocksize=$[4
* 1024] /dev/mmcblk0 --open-au --random
4MiB    4.51M/s
2MiB    4.15M/s
1MiB    3.58M/s
512KiB  3.25M/s
256KiB  4.01M/s
128KiB  3.46M/s
64KiB   3.43M/s
32KiB   2.95M/s
16KiB   2.97M/s
8KiB    2.19M/s
4KiB    1.56M/s

$ sudo ./flashbench -O --erasesize=$[4 * 1024 * 1024] --blocksize=$[4
* 1024] /dev/mmcblk0 --open-au
4MiB    4.11M/s
2MiB    3.01M/s
1MiB    2.95M/s
512KiB  2.72M/s
256KiB  2.52M/s
128KiB  2.57M/s
64KiB   3.36M/s
32KiB   2.68M/s
16KiB   2.3M/s
8KiB    1.8M/s
4KiB    1.51M/s

$ sudo ./flashbench -O --erasesize=$[4 * 1024 * 1024] --blocksize=$[4
* 1024] /dev/mmcblk0 --open-au-nr=1 --random
4MiB    4.21M/s
2MiB    4.28M/s
1MiB    3.16M/s
512KiB  4.4M/s
256KiB  3.5M/s
128KiB  3.52M/s
64KiB   4.17M/s
32KiB   3.75M/s
16KiB   2.56M/s
8KiB    2.66M/s
4KiB    1.75M/s

$ sudo ./flashbench -O --erasesize=$[4 * 1024 * 1024] --blocksize=$[4
* 1024] /dev/mmcblk0 --open-au-nr=1
4MiB    4.2M/s
2MiB    3.84M/s
1MiB    4.34M/s
512KiB  4.36M/s
256KiB  3.53M/s
128KiB  3.8M/s
64KiB   4.32M/s
32KiB   3.85M/s
16KiB   3.78M/s
8KiB    3.34M/s
4KiB    2.95M/s

It gave me a consistent throughput as long as upto 7 erase blocks were
open. Performance with 8 open erase blocks is not that bad either.

$ sudo ./flashbench -O --erasesize=$[4 * 1024 * 1024] --blocksize=$[4
* 1024] /dev/mmcblk0 --open-au-nr=7 --random
4MiB    3.73M/s
2MiB    3.02M/s
1MiB    3.14M/s
512KiB  2.88M/s
256KiB  2.48M/s
128KiB  2.34M/s
64KiB   2.16M/s
32KiB   1.96M/s
16KiB   1.55M/s
8KiB    1.04M/s
4KiB    1.01M/s

$ sudo ./flashbench -O --erasesize=$[4 * 1024 * 1024] --blocksize=$[4
* 1024] /dev/mmcblk0 --open-au-nr=7
4MiB    3.4M/s
2MiB    3.1M/s
1MiB    3.01M/s
512KiB  3.12M/s
256KiB  2.91M/s
128KiB  2.87M/s
64KiB   2.58M/s
32KiB   2.78M/s
16KiB   2.37M/s
8KiB    1.85M/s
4KiB    1.28M/s

$ sudo ./flashbench -O --erasesize=$[4 * 1024 * 1024] --blocksize=$[4
* 1024] /dev/mmcblk0 --open-au-nr=8 --random
4MiB    3.66M/s
2MiB    2.94M/s
1MiB    3.04M/s
512KiB  2.55M/s
256KiB  2.46M/s
128KiB  2.27M/s
64KiB   1.96M/s
32KiB   1.53M/s
16KiB   1.38M/s
8KiB    955K/s
4KiB    823K/s

$ sudo ./flashbench -O --erasesize=$[4 * 1024 * 1024] --blocksize=$[4
* 1024] /dev/mmcblk0 --open-au-nr=8
4MiB    3.36M/s
2MiB    2.69M/s
1MiB    2.66M/s
512KiB  2.56M/s
256KiB  2.41M/s
128KiB  2.4M/s
64KiB   2.14M/s
32KiB   2.04M/s
16KiB   2.01M/s
8KiB    1.65M/s
4KiB    1.2M/s