Re: [BENCHMARK] I/O regression after 2.6.0-test5

[Nick Piggin]

rwhron@xxxxxxxxxxxxx wrote:

> > If you have time, would you please try testing as-iosched.c from
> > test5 in a later kernel (it won't go into test8-mm1 though).
>
> copying drivers/block/as-iosched.c from 2.6.0-test5 to test8
> looks like it fixes the regression.  Here are the results so far.
>
> In the AIM7 database benchmark, jobs/minute using test5 as-iosched.c
> doubled.  At 32 tasks, jobs/min went from 300 to 601.
> At 256 tasks, jobs/min went from 552 to 1010.

Yep, looks right. Thanks for your thoroughness. There are a few
important direct IO bug fixes gone in there as well (hopefully
they aren't causing the regressions... unlikely), so for stability
you'll want to continue to use the test8 version.

I'll get a patch out soon.


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