[Flashbench] Kingston 2GB microSD

[Arnd Bergmann]

==> /sys/block/mmcblk0/device/block <==
==> /sys/block/mmcblk0/device/cid <==
02544d53413032470520cddb0600a900
==> /sys/block/mmcblk0/device/csd <==
002e00325b5aa3acffffff800a800000
==> /sys/block/mmcblk0/device/date <==
09/2010
==> /sys/block/mmcblk0/device/driver <==
==> /sys/block/mmcblk0/device/erase_size <==
512
==> /sys/block/mmcblk0/device/fwrev <==
0x5
==> /sys/block/mmcblk0/device/hwrev <==
0x0
==> /sys/block/mmcblk0/device/manfid <==
0x000002
==> /sys/block/mmcblk0/device/name <==
SA02G
==> /sys/block/mmcblk0/device/oemid <==
0x544d # "TM" -> Toshiba
==> /sys/block/mmcblk0/device/power <==
==> /sys/block/mmcblk0/device/preferred_erase_size <==
4194304
==> /sys/block/mmcblk0/device/scr <==
0225800001000000
==> /sys/block/mmcblk0/device/serial <==
0x20cddb06
==> /sys/block/mmcblk0/device/subsystem <==
==> /sys/block/mmcblk0/device/type <==
SD
==> /sys/block/mmcblk0/device/uevent <==
DRIVER=mmcblk
MMC_TYPE=SD
MMC_NAME=SA02G
MODALIAS=mmc:block

arnd at klappe2:~/git/flashbench$ sudo fdisk -l /dev/mmcblk0

Disk /dev/mmcblk0: 1973 MB, 1973420032 bytes
# 1,927,168KB


# 2 MB erase block size:
align 6291456   pre 1.81ms      on 2.39ms       post 1.31ms     diff 834µs
align 4194304   pre 2.07ms      on 2.39ms       post 1.31ms     diff 702µs
align 3145728   pre 1.33ms      on 1.49ms       post 1.32ms     diff 162µs
align 2097152   pre 2.03ms      on 2.4ms        post 1.3ms      diff 729µs
align 1572864   pre 1.34ms      on 1.5ms        post 1.33ms     diff 162µs
align 1048576   pre 1.41ms      on 1.57ms       post 1.33ms     diff 195µs
align 786432    pre 1.36ms      on 1.52ms       post 1.35ms     diff 165µs

#linear access, one erase block
arnd at klappe2:~/git/flashbench$ sudo ./flashbench  /dev/mmcblk0 --open-au --open-au-nr=1   --blocksize=512
4MiB    5.49M/s 
2MiB    4.07M/s 
1MiB    4.1M/s  
512KiB  4.12M/s 
256KiB  4.13M/s 
128KiB  5.77M/s 
64KiB   9.5M/s  
32KiB   8.54M/s 
16KiB   6.48M/s 
8KiB    3.94M/s 
4KiB    1.28M/s 
2KiB    543K/s  
1KiB	2K/s

# random access, one erase block: cannot do random access
arnd at klappe2:~/git/flashbench$ sudo ./flashbench  /dev/mmcblk0 --open-au --open-au-nr=1 --random   --blocksize=2048
4MiB    7.61M/s 
2MiB    2.27M/s 
1MiB    2.86M/s 
512KiB  1.19M/s 
256KiB  553K/s  
128KiB  309K/s  
64KiB   255K/s  
32KiB   135K/s  

# linear access, two erase blocks: cannot be handled either:
arnd at klappe2:~/git/flashbench$ sudo ./flashbench  /dev/mmcblk0 --open-au --open-au-nr=2   --blocksize=2048
4MiB    7.21M/s 
2MiB    9.44M/s 
1MiB    4.45M/s 
512KiB  1.95M/s 
256KiB  944K/s  
128KiB  464K/s