On 03-08-09 13:08, zuowenping wrote:
I am testing the speed of sd/mmc in dm355 which using kernel 2.6.18.
bash-3.00# mount /dev/mmcblk0p1 /mnt -o sync
bash-3.00# time cp /tmp/ramdisk.img.gz /mnt/
That's not testing how fast the sd card is, that's testing how sucky the
interaction between the block and fs schedulers is for sync mounts.
A better test would be to do 'hdparm -tT /dev/mmcblk0' or 'dd
if=/dev/mmcblk0 of=/dev/null bs=512k'.
regards,
Koen
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