On Freitag, 25. März 2011 Arnd Bergmann wrote:
If so, what should an ideal partition table look like?
# create the partititon table echo 8192,,7 | sudo sfdisk -uS -L -f /dev/sde
Thanks, did that.
Before you do that, could I ask you to run
flashbench --findfat --fat-nr=6 /dev/sde --blocksize=512
and post the results here?
# ./flashbench --findfat --fat-nr=6 /dev/sde --blocksize=512 sched_setscheduler: Operation not permitted 4MiB 7.94M/s 7.97M/s 7.95M/s 7.98M/s 7.85M/s 7.95M/s 2MiB 5.57M/s 5.55M/s 5.56M/s 5.53M/s 5.57M/s 5.55M/s 1MiB 24.3M/s 24M/s 7M/s 6.93M/s 6.96M/s 6.88M/s 512KiB 23.6M/s 23.9M/s 6.09M/s 6.06M/s 6.11M/s 6.07M/s 256KiB 4.41M/s 4.43M/s 4.44M/s 4.42M/s 4.45M/s 4.39M/s 128KiB 4.17M/s 4.15M/s 4.16M/s 4.16M/s 3.09M/s 3.09M/s 64KiB 21.5M/s 4.59M/s 4.52M/s 22M/s 4.57M/s 4.67M/s 32KiB 16.8M/s 16M/s 16.4M/s 16.1M/s 16.2M/s 16.4M/s 16KiB 4.62M/s 4.49M/s 4.45M/s 4.41M/s 4.49M/s 4.43M/s 8KiB 1.93M/s 1.94M/s 1.96M/s 2.01M/s 1.95M/s 2.01M/s 4KiB 970K/s 971K/s 1.01M/s 973K/s 990K/s 1.02M/s 2KiB 467K/s 481K/s 468K/s 467K/s 468K/s 472K/s 1KiB 235K/s 234K/s 236K/s 232K/s 230K/s 225K/s 512B 120K/s 118K/s 118K/s 118K/s 117K/s 120K/s
I was wondering why the 1M,512K,64K was faster, and rerun the test twice for the bigger areas:
# ./flashbench --findfat --fat-nr=6 /dev/sde --blocksize=512 sched_setscheduler: Operation not permitted 4MiB 23.1M/s 23M/s 22.8M/s 22.9M/s 7.85M/s 7.91M/s 2MiB 6.67M/s 5.58M/s 5.58M/s 5.56M/s 5.57M/s 5.55M/s 1MiB 23.3M/s 24M/s 6.98M/s 7.02M/s 6.95M/s 6.89M/s 512KiB 23.6M/s 23.5M/s 6.11M/s 6.13M/s 6.07M/s 6.08M/s 256KiB 4.46M/s 4.44M/s 4.41M/s 4.41M/s 4.47M/s 4.42M/s 128KiB 4.15M/s 4.1M/s 4.12M/s 4.14M/s 3.09M/s 3.09M/s 64KiB 21.4M/s 21.9M/s 4.49M/s 4.58M/s 4.57M/s 4.52M/s 32KiB 16.2M/s 17M/s 16.4M/s 17.1M/s 17.1M/s 17M/s ^C # ./flashbench --findfat --fat-nr=6 /dev/sde --blocksize=512 sched_setscheduler: Operation not permitted 4MiB 7.21M/s 22.8M/s 23.4M/s 22.5M/s 7.88M/s 7.88M/s 2MiB 7.24M/s 6.72M/s 5.57M/s 5.58M/s 6.68M/s 6.68M/s 1MiB 24.2M/s 24.7M/s 6.91M/s 6.88M/s 6.95M/s 7M/s 512KiB 23.6M/s 23.8M/s 6.14M/s 6.04M/s 6.9M/s 6.94M/s 256KiB 4.48M/s 4.45M/s 4.45M/s 4.45M/s 6.75M/s 6.61M/s 128KiB 4.15M/s 4.15M/s 3.09M/s 3.08M/s 4.13M/s 4.14M/s 64KiB 22.7M/s 22.3M/s 4.54M/s 4.53M/s 6.72M/s 6.59M/s 32KiB 15.5M/s 15.7M/s 16.1M/s 16.5M/s 5.93M/s 5.71M/s ^C
Seems there's a big variation in the 4M, 1M, 512K and 64K tests. Is that normal?
That will add the two missing pieces of information for the survey, the page size and the location of the FAT. I've already entered the other data into the wiki.
And what would I read from those results? Is the 1M,512K and 64K result so much faster because the stick is FAT optimized?