==> /sys/block/mmcblk0/device/block <== head: error reading `/sys/block/mmcblk0/device/block': Is a directory

==> /sys/block/mmcblk0/device/cid <== 03534453443034478030cd99b2007600

==> /sys/block/mmcblk0/device/csd <== 400e00325b5900001e5c7f800a404000

==> /sys/block/mmcblk0/device/date <== 06/2007

==> /sys/block/mmcblk0/device/driver <== head: error reading `/sys/block/mmcblk0/device/driver': Is a directory

==> /sys/block/mmcblk0/device/erase_size <== 512

==> /sys/block/mmcblk0/device/fwrev <== 0x0

==> /sys/block/mmcblk0/device/hwrev <== 0x8

==> /sys/block/mmcblk0/device/manfid <== 0x000003

==> /sys/block/mmcblk0/device/name <== SD04G

==> /sys/block/mmcblk0/device/oemid <== 0x5344

==> /sys/block/mmcblk0/device/power <== head: error reading `/sys/block/mmcblk0/device/power': Is a directory

==> /sys/block/mmcblk0/device/preferred_erase_size <== 4194304

==> /sys/block/mmcblk0/device/scr <== 0235000000000000

==> /sys/block/mmcblk0/device/serial <== 0x30cd99b2

==> /sys/block/mmcblk0/device/subsystem <== head: error reading `/sys/block/mmcblk0/device/subsystem': Is a directory

==> /sys/block/mmcblk0/device/type <== SD

==> /sys/block/mmcblk0/device/uevent <== DRIVER=mmcblk MMC_TYPE=SD MMC_NAME=SD04G MODALIAS=mmc:block

$ sudo ./flashbench -a /dev/mmcblk0 --blocksize 1024 align 805306368 pre 781µs on 816µs post 639µs diff 106µs align 536870912 pre 783µs on 836µs post 662µs diff 113µs align 402653184 pre 823µs on 857µs post 665µs diff 113µs align 268435456 pre 831µs on 867µs post 659µs diff 122µs align 201326592 pre 768µs on 806µs post 609µs diff 117µs align 134217728 pre 833µs on 868µs post 663µs diff 120µs align 100663296 pre 777µs on 806µs post 611µs diff 111µs align 67108864 pre 722µs on 785µs post 592µs diff 128µs align 50331648 pre 706µs on 782µs post 671µs diff 93.7µs align 33554432 pre 744µs on 797µs post 576µs diff 136µs align 25165824 pre 554µs on 649µs post 572µs diff 85.3µs align 16777216 pre 637µs on 681µs post 567µs diff 79.4µs align 12582912 pre 648µs on 677µs post 581µs diff 62.2µs align 8388608 pre 650µs on 678µs post 582µs diff 61.8µs align 6291456 pre 714µs on 747µs post 586µs diff 96.7µs align 4194304 pre 729µs on 772µs post 662µs diff 76.5µs align 3145728 pre 650µs on 684µs post 586µs diff 65.4µs align 2097152 pre 720µs on 747µs post 582µs diff 95.8µs align 1572864 pre 731µs on 745µs post 669µs diff 45.3µs align 1048576 pre 781µs on 837µs post 658µs diff 117µs align 786432 pre 690µs on 692µs post 671µs diff 11.1µs align 524288 pre 732µs on 745µs post 666µs diff 45.7µs align 393216 pre 704µs on 686µs post 673µs diff -1998ns align 262144 pre 694µs on 689µs post 671µs diff 6.82µs align 196608 pre 701µs on 687µs post 674µs diff -594ns align 131072 pre 690µs on 685µs post 670µs diff 5.34µs align 98304 pre 702µs on 690µs post 670µs diff 4.34µs align 65536 pre 704µs on 685µs post 670µs diff -2468ns align 49152 pre 685µs on 697µs post 658µs diff 25.7µs align 32768 pre 701µs on 688µs post 671µs diff 2.15µs align 24576 pre 604µs on 679µs post 675µs diff 39.4µs align 16384 pre 694µs on 691µs post 656µs diff 15.7µs align 12288 pre 651µs on 656µs post 642µs diff 9.39µs align 8192 pre 625µs on 669µs post 671µs diff 21µs align 6144 pre 641µs on 626µs post 632µs diff -10210n

sudo ./flashbench --open-au --erasesize=$[2*512*1024] --blocksize=8192 /dev/mmcblk0 --open-au-nr=3 --random 1MiB 8.38M/s 512KiB 8.38M/s 256KiB 7.01M/s 128KiB 7.06M/s 64KiB 6.93M/s 32KiB 5.54M/s 16KiB 5.42M/s 8KiB 2.26M/s

--blocksize=8192 /dev/mmcblk0 --open-au-nr=3 --random 1MiB 6.85M/s 512KiB 8.35M/s 256KiB 8.37M/s 128KiB 7.01M/s 64KiB 7.01M/s 32KiB 6.67M/s 16KiB 5.43M/s 8KiB 2.26M/s arnd@klappe2:~/git/flashbench$ sudo ./flashbench --open-au --erasesize=$[1024*1024] --blocksize=8192 /dev/mmcblk0 --open-au-nr=4 --random 1MiB 7.89M/s 512KiB 9.3M/s 256KiB 7.98M/s 128KiB 4.76M/s 64KiB 3.55M/s ^C arnd@klappe2:~/git/flashbench$ sudo ./flashbench --open-au --erasesize=$[1024*1024] --blocksize=8192 /dev/mmcblk0 --open-au-nr=4 --random 1MiB 7.98M/s 512KiB 8.01M/s 256KiB 7.04M/s 128KiB 5.2M/s 64KiB 3.38M/s 32KiB 1.95M/s 16KiB 1.01M/s 8KiB 498K/s

arnd@klappe2:~/git/flashbench$ sudo ./flashbench --open-au --erasesize=$[1024*1024] --blocksize=8192 /dev/mmcblk0 --open-au-nr=7 1MiB 12M/s 512KiB 10.7M/s 256KiB 10.6M/s 128KiB 10.6M/s 64KiB 10.6M/s 32KiB 12M/s 16KiB 8.91M/s 8KiB 6.15M/s arnd@klappe2:~/git/flashbench$ sudo ./flashbench --open-au --erasesize=$[1024*1024] --blocksize=8192 /dev/mmcblk0 --open-au-nr=10 1MiB 12.3M/s 512KiB 6.71M/s 256KiB 3.46M/s 128KiB 1.68M/s

arnd@klappe2:~/git/flashbench$ sudo ./flashbench --open-au --erasesize=$[1024*1024] --blocksize=512 /dev/mmcblk0 --open-au-nr=7 1MiB 8.21M/s 512KiB 10.5M/s 256KiB 10.4M/s 128KiB 10.4M/s 64KiB 10.5M/s 32KiB 11.7M/s 16KiB 8.93M/s 8KiB 6.1M/s 4KiB 3.32M/s 2KiB 1.62M/s