Disk /dev/sdc: 8 GB, 8011422720 bytes 255 heads, 63 sectors/track, 974 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System /dev/sdc1 * 1 973 7815591 b FAT32
arnd@wuerfel:~/flashbench$ sudo ./flashbench -a /dev/sdc --blocksize=1024 align 1073741824 pre 614µs on 711µs post 616µs diff 96.2µs align 536870912 pre 599µs on 702µs post 597µs diff 104µs align 268435456 pre 591µs on 717µs post 592µs diff 126µs align 134217728 pre 598µs on 686µs post 590µs diff 92.2µs align 67108864 pre 595µs on 688µs post 596µs diff 92.2µs align 33554432 pre 600µs on 722µs post 595µs diff 124µs align 16777216 pre 595µs on 705µs post 591µs diff 112µs align 8388608 pre 594µs on 672µs post 601µs diff 74.1µs align 4194304 pre 611µs on 706µs post 616µs diff 92.6µs align 2097152 pre 611µs on 722µs post 611µs diff 110µs align 1048576 pre 603µs on 619µs post 619µs diff 7.93µs align 524288 pre 613µs on 616µs post 615µs diff 1.22µs align 262144 pre 610µs on 614µs post 617µs diff 923ns align 131072 pre 611µs on 617µs post 614µs diff 4.7µs align 65536 pre 614µs on 619µs post 620µs diff 1.61µs align 32768 pre 609µs on 618µs post 615µs diff 5.75µs align 16384 pre 612µs on 617µs post 617µs diff 2.55µs align 8192 pre 609µs on 611µs post 609µs diff 1.91µs align 4096 pre 605µs on 604µs post 606µs diff -1900ns align 2048 pre 609µs on 617µs post 616µs diff 4.75µs
arnd@wuerfel:~/flashbench$ sudo ./flashbench --erasesize=2097152 /dev/sdc --open-au --open-au-nr=1 --blocksize=512 2MiB 15.9M/s 1MiB 15.8M/s 512KiB 15.5M/s 256KiB 15.5M/s 128KiB 13.8M/s 64KiB 17.2M/s 32KiB 16.5M/s 16KiB 14.8M/s 8KiB 5.39M/s 4KiB 2.78M/s 2KiB 1.41M/s 1KiB 827K/s 512B 440K/s arnd@wuerfel:~/flashbench$ sudo ./flashbench --erasesize=2097152 /dev/sdc --open-au --open-au-nr=3 --blocksize=512 2MiB 15.7M/s 1MiB 10.2M/s 512KiB 15.6M/s 256KiB 15.7M/s 128KiB 13.9M/s 64KiB 17.5M/s 32KiB 16.8M/s 16KiB 14.6M/s 8KiB 5.4M/s 4KiB 2.7M/s 2KiB 1.41M/s 1KiB 814K/s 512B 442K/s
arnd@wuerfel:~/flashbench$ sudo ./flashbench --erasesize=2097152 /dev/sdc --open-au --blocksize=8192 --random --open-au-nr=3 2MiB 15.8M/s 1MiB 11M/s 512KiB 5.81M/s 256KiB 4.11M/s 128KiB 5.5M/s 64KiB 5.85M/s 32KiB 2.97M/s 16KiB 2.69M/s 8KiB 1.68M/s
(again:) arnd@wuerfel:~/flashbench$ sudo ./flashbench --erasesize=2097152 /dev/sdc --open-au --blocksize=8192 --random --open-au-nr=3 2MiB 5.2M/s 1MiB 5.2M/s 512KiB 5.13M/s 256KiB 5.19M/s 128KiB 4.89M/s 64KiB 4.07M/s 32KiB 3.83M/s 16KiB 2.89M/s 8KiB 1.61M/s
arnd@wuerfel:~/flashbench$ sudo ./flashbench --erasesize=2097152 /dev/sdc --open-au --blocksize=8192 --open-au-nr=3 2MiB 5.94M/s 1MiB 4.58M/s 512KiB 5.97M/s 256KiB 5.09M/s 128KiB 5.9M/s 64KiB 5.66M/s 32KiB 9.88M/s 16KiB 14.8M/s 8KiB 5.42M/s arnd@wuerfel:~/flashbench$ sudo ./flashbench --erasesize=2097152 /dev/sdc --open-au --blocksize=8192 --open-au-nr=3 2MiB 15.8M/s 1MiB 16M/s 512KiB 16M/s 256KiB 15.7M/s 128KiB 13.8M/s 64KiB 17.7M/s 32KiB 16.8M/s 16KiB 14.8M/s 8KiB 5.2M/s arnd@wuerfel:~/flashbench$ sudo ./flashbench --erasesize=2097152 /dev/sdc --open-au --blocksize=8192 --open-au-nr=4 2MiB 11.4M/s 1MiB 11.2M/s 512KiB 4.9M/s 256KiB 2.2M/s 128KiB 941K/s 64KiB 433K/s 32KiB 214K/s 16KiB 107K/s 8KiB 53.2K/s arnd@wuerfel:~/flashbench$ sudo ./flashbench --erasesize=2097152 /dev/sdc --open-au --blocksize=8192 --open-au-nr=4 --random 2MiB 6.25M/s 1MiB 6.79M/s 512KiB 4.98M/s 256KiB 4.19M/s 128KiB 4.62M/s 64KiB 5.88M/s 32KiB 3.39M/s 16KiB 3.2M/s 8KiB 1.42M/s arnd@wuerfel:~/flashbench$ sudo ./flashbench --erasesize=2097152 /dev/sdc --open-au --blocksize=8192 --open-au-nr=5 --random 2MiB 6.84M/s 1MiB 6.59M/s 512KiB 4.48M/s 256KiB 3.33M/s 128KiB 2.57M/s 64KiB 1.45M/s 32KiB 780K/s 16KiB 398K/s 8KiB 199K/s
arnd@wuerfel:~/flashbench$ sudo ./flashbench --erasesize=2097152 /dev/sdc --blocksize=8192 -f --fat-nr=8 2MiB 16M/s 16.1M/s 15.9M/s 16M/s 15.8M/s 16M/s 15.8M/s 16M/s 1MiB 16.1M/s 16M/s 16.3M/s 16.1M/s 15.7M/s 16M/s 16.3M/s 16.2M/s 512KiB 15.9M/s 16.1M/s 16.2M/s 16M/s 16M/s 16.1M/s 16.1M/s 15.9M/s 256KiB 16M/s 15.4M/s 15.7M/s 15.8M/s 15.7M/s 15.5M/s 15.9M/s 16.1M/s 128KiB 14.1M/s 14M/s 14M/s 14.1M/s 14.3M/s 14M/s 14M/s 14M/s 64KiB 17.5M/s 17.7M/s 17.9M/s 17.9M/s 17.9M/s 17.8M/s 17.9M/s 17.9M/s 32KiB 16.8M/s 16.8M/s 17M/s 16.8M/s 16.9M/s 16.7M/s 16.6M/s 16.7M/s 16KiB 14.7M/s 14.8M/s 14.8M/s 14.9M/s 14.9M/s 14.9M/s 10.8M/s 14.8M/s 8KiB 5.55M/s 5.51M/s 5.43M/s 5.49M/s 5.55M/s 5.51M/s 5.49M/s 5.49M/s