On Thursday 28 July 2011 14:46:34 Ajax Criterion wrote:
bash-4.1# flashbench --findfat --fat-nr=15 --erasesize=$[1* 1024*1024] --random --blocksize=512 /dev/sdc 1MiB 3.04M/s 7.38M/s 3.06M/s 3.06M/s 3.06M/s 3.07M/s 3.05M/s 7.47M/s 7.46M/s 7.45M/s 7.42M/s 7.39M/s 7.39M/s 7.35M/s 7.46M/s 512KiB 7.09M/s 7.24M/s 3.04M/s 3.05M/s 3.07M/s 3.04M/s 2.41M/s 2.43M/s 2.42M/s 2.44M/s 3.16M/s 3.18M/s 3.18M/s 3.16M/s 3.16M/s 256KiB 3.01M/s 4.28M/s 4.27M/s 4.28M/s 4.28M/s 3.01M/s 2.39M/s 2.4M/s 2.41M/s 2.42M/s 2.4M/s 2.4M/s 2.4M/s 2.42M/s 2.41M/s 128KiB 6.76M/s 2.98M/s 3M/s 2.99M/s 2.97M/s 2.97M/s 2.98M/s 1.87M/s 3M/s 2.98M/s 2.99M/s 2.99M/s 2.99M/s 2.97M/s 2.99M/s 64KiB 2.98M/s 3M/s 2.98M/s 2.98M/s 2.99M/s 3M/s 2.19M/s 2.19M/s 2.18M/s 2.19M/s 2.19M/s 2.19M/s 2.2M/s 2.2M/s 2.19M/s 32KiB 2.82M/s 2.84M/s 2.84M/s 2.83M/s 2.83M/s 2.82M/s 2.83M/s 2.86M/s 2.83M/s 2.83M/s 2.85M/s 2.84M/s 2.84M/s 2.84M/s 2.84M/s 16KiB 5.14M/s 2.61M/s 2.6M/s 2.62M/s 2.61M/s 2.62M/s 2.62M/s 2.61M/s 2.61M/s 2.62M/s 2.61M/s 2.6M/s 2.6M/s 2.61M/s 2.63M/s 8KiB 2.24M/s 1.56M/s 2.26M/s 2.25M/s 2.25M/s 2.25M/s 2.23M/s 2.24M/s 2.25M/s 2.23M/s 2.24M/s 2.25M/s 1.34M/s 1.34M/s 1.34M/s 4KiB 1.04M/s 1.05M/s 1.05M/s 1.05M/s 1.05M/s 1.05M/s 919K/s 779K/s 783K/s 785K/s 787K/s 784K/s 784K/s 785K/s 783K/s 2KiB 507K/s 464K/s 507K/s 508K/s 507K/s 508K/s 466K/s 430K/s 429K/s 428K/s 427K/s 429K/s 429K/s 429K/s 429K/s ^C bash-4.1# ^C bash-4.1#
Strange....still a lot of variation going on. I'll leave the final analysis up to you...obviously
I have no idea either. My guess is that it doesn't actually do anything special here, and all we see are side-effects of the way we measure.
Arnd