Re: [Bug #12809] iozone regression with 2.6.29-rc6

Wu Fengguang
2009-03-05T01:09:20Z

On Tue, Mar 03, 2009 at 09:25:59PM +0200, Rafael J. Wysocki wrote:
> This message has been generated automatically as a part of a report
> of recent regressions.
>
> The following bug entry is on the current list of known regressions
> from 2.6.28. Please verify if it still should be listed and let me know
> (either way).
>
>
> Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=12809
> Subject : iozone regression with 2.6.29-rc6
> Submitter : Lin Ming <ming.m.lin-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> Date : 2009-02-27 9:13 (5 days old)
> First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=1cf6e7d83bf334cc5916137862c920a97aabc018
> References : http://marc.info/?l=linux-kernel&m=123572630504360&w=4
> Handled-By : Wu Fengguang <fengguang.wu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>

Following Peter's idea of relaxing writeback throttling, Lin Ming
and I tried the idea of totally disabling writeback throttling by
doing benchmarks with the following parameters:

echo 60 > /proc/sys/vm/dirty_ratio
echo 50 > /proc/sys/vm/dirty_background_ratio

The result is encouraging: the iozone performance is restored to the
level of 2.6.29-rc5!

We'll continue to evaluate the dirty/throttling numbers with Nick's patch.

Thanks,
Fengguang