andrew@kaim-eeyore:~$ sudo fdisk -l /dev/sdl
Disk /dev/sdl: 29.9 GiB, 32080200192 bytes, 62656641 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: 0xc3072e18
Device Boot Start End Sectors Size Id Type
/dev/sdl1 224 62656640 62656417 29.9G c W95 FAT32 (LBA)
andrew@kaim-eeyore:~$ sudo ~/bin/flashbench -a /dev/sdl
--blocksize=1024 --count=100
align 8589934592 pre 122µs on 144µs post 141µs diff 12.5µs
align 4294967296 pre 122µs on 151µs post 136µs diff 21.8µs
align 2147483648 pre 122µs on 151µs post 135µs diff 22µs
align 1073741824 pre 122µs on 151µs post 136µs diff 21.9µs
align 536870912 pre 145µs on 184µs post 157µs diff 33.9µs
align 268435456 pre 143µs on 184µs post 158µs diff 33.9µs
align 134217728 pre 142µs on 184µs post 158µs diff 33.7µs
align 67108864 pre 145µs on 185µs post 156µs diff 34.2µs
align 33554432 pre 143µs on 183µs post 156µs diff 33µs
align 16777216 pre 137µs on 173µs post 152µs diff 28.3µs
align 8388608 pre 144µs on 186µs post 158µs diff 35µs
align 4194304 pre 142µs on 181µs post 156µs diff 32.4µs
align 2097152 pre 145µs on 186µs post 158µs diff 34.7µs
align 1048576 pre 142µs on 181µs post 155µs diff 32.5µs
align 524288 pre 131µs on 147µs post 146µs diff 8.49µs
align 262144 pre 130µs on 146µs post 145µs diff 8.46µs
align 131072 pre 131µs on 146µs post 145µs diff 8.34µs
align 65536 pre 134µs on 146µs post 151µs diff 2.75µs
align 32768 pre 131µs on 146µs post 145µs diff 7.84µs
align 16384 pre 133µs on 149µs post 148µs diff 8.51µs
align 8192 pre 133µs on 167µs post 148µs diff 26.1µs
align 4096 pre 132µs on 148µs post 147µs diff 7.98µs
align 2048 pre 133µs on 133µs post 133µs diff 802ns
# Looks like 1MiB erase blocks
andrew@kaim-eeyore:~$ sudo ~/bin/flashbench /dev/sdl --open-au
--erasesize=$[1*1024*1024] --blocksize=$[4*1024] --open-au-nr=1
1MiB 139M/s
512KiB 125M/s
256KiB 28.7M/s
128KiB 76.9M/s
64KiB 52.6M/s
32KiB 31.8M/s
16KiB 18M/s
8KiB 10.3M/s
4KiB 6.78M/s
andrew@kaim-eeyore:~$ sudo ~/bin/flashbench /dev/sdl --open-au
--erasesize=$[1*1024*1024] --blocksize=$[4*1024] --open-au-nr=30
1MiB 17.2M/s
512KiB 27M/s
256KiB 24.4M/s
128KiB 21.7M/s
64KiB 13.2M/s
32KiB 15.2M/s
16KiB 11.5M/s
8KiB 7.65M/s
4KiB 4.85M/s
andrew@kaim-eeyore:~$ sudo ~/bin/flashbench /dev/sdl --open-au
--erasesize=$[1*1024*1024] --blocksize=$[4*1024] --random
--open-au-nr=30
1MiB 28.4M/s
512KiB 27.1M/s
256KiB 24.4M/s
128KiB 14.5M/s
64KiB 18.9M/s
32KiB 15.3M/s
16KiB 11.1M/s
8KiB 6.43M/s
4KiB 5.39M/s
# Drive is quite fast even with many open-au. Seems impressive for
such a physically small and inexpensive drive.
Thanks,
Andrew
