flashbench and erase block size of ssd

[unknown2]

has anyone use flashbench before?

i am trying to determine the erase block size of my old intel x25-e ssd, but the result of flashbench is quite confusing

Can anyone helps?


https://github.com/bradfa/flashbench

#read test
$ sudo flashbench -a /dev/sdb1 --blocksize=1024
align 8589934592 pre 89.9µs on 79.3µs post 90.4µs diff -10811n
align 4294967296 pre 90.4µs on 85µs post 90.4µs diff -5373ns
align 2147483648 pre 89.9µs on 77.6µs post 90.5µs diff -12604n
align 1073741824 pre 90µs on 77.5µs post 90µs diff -12447n
align 536870912 pre 90.4µs on 78.2µs post 90.1µs diff -12052n
align 268435456 pre 90.2µs on 88.2µs post 90.4µs diff -2131ns
align 134217728 pre 90.3µs on 77.7µs post 90µs diff -12420n
align 67108864 pre 89.7µs on 77.1µs post 89.8µs diff -12656n
align 33554432 pre 90.2µs on 77.1µs post 90.2µs diff -13081n
align 16777216 pre 90.4µs on 77.7µs post 90µs diff -12507n
align 8388608 pre 90.4µs on 77.3µs post 90.5µs diff -13151n
align 4194304 pre 90.6µs on 77.8µs post 90.3µs diff -12637n
align 2097152 pre 90.3µs on 77.8µs post 90.3µs diff -12535n
align 1048576 pre 90.1µs on 77.7µs post 90µs diff -12363n
align 524288 pre 90.5µs on 77.7µs post 90.4µs diff -12774n
align 262144 pre 90.1µs on 77.3µs post 90.2µs diff -12845n
align 131072 pre 90.4µs on 78.4µs post 90.6µs diff -12132n
align 65536 pre 90.3µs on 77.8µs post 90.1µs diff -12379n
align 32768 pre 90µs on 77.1µs post 90.1µs diff -12921n
align 16384 pre 90.3µs on 77.4µs post 90.2µs diff -12832n
align 8192 pre 90.2µs on 84.7µs post 90.3µs diff -5525ns
align 4096 pre 90.3µs on 77.5µs post 90.1µs diff -12642n
align 2048 pre 90.2µs on 90.3µs post 88.6µs diff 855ns

#first trial of write test
$ sudo flashbench -O --erasesize=$[64 * 1024 * 1024] --blocksize=$[256 * 1024] /dev/sdb1 --open-au-nr=2 --random
64MiB 177M/s
32MiB 175M/s
16MiB 202M/s
8MiB 154M/s
4MiB 112M/s
2MiB 109M/s
1MiB 102M/s
512KiB 85.1M/s
256KiB 69.7M/s

#second trial of write test
$ sudo flashbench -O --erasesize=$[64 * 1024 * 1024] --blocksize=$[256 * 1024] /dev/sdb1 --open-au-nr=2 --random
64MiB 205M/s
32MiB 185M/s
16MiB 174M/s
8MiB 164M/s
4MiB 111M/s
2MiB 110M/s
1MiB 98.8M/s
512KiB 84.3M/s
256KiB 70.1M/s