On 29-Jan-99 Hisaaki Shibata wrote:
> I tested raid performance with my linux box.
>
> Env. is ...
> o Intel "Providence" PR440FX motherboard
> o Dual Pentium Pro Processor (233 MHz)
> o 256 MB of RAM
^^^^^
> MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
> 100 2919 72.2 28901 88.1 10189 94.4 3613 91.4 128791 100.6 9947.4 198.9
^^^^^
Your results don't reflect a real RAID performance: the size of the file you
used (100MB) is well below available RAM and Linux, being a smart boy, did most
of the I/O in the memory buffers instead of actually writting to disks. Use the
"-s" switch of bonnie to tell it to use larger files. You may want to plot
(some of) benchmark results as a function of the file size. You'll see a sharp
drop at the point where the file size exceeds the physical memory and then
remain practically constant.
Regards,
Evgeny
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/ Plasma Laboratory, Weizmann Institute of Science, Israel \ \
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