From: Jeff Moyer <jmoyer@redhat.com>
To: Jan Kara <jack@suse.cz>
Cc: jens.axboe@oracle.com, LKML <linux-kernel@vger.kernel.org>,
Chris Mason <chris.mason@oracle.com>,
Andrew Morton <akpm@linux-foundation.org>,
Mike Galbraith <efault@gmx.de>
Subject: Re: Performance regression in IO scheduler still there
Date: Mon, 26 Oct 2009 13:26:54 -0400 [thread overview]
Message-ID: <x49pr8avzfl.fsf@segfault.boston.devel.redhat.com> (raw)
In-Reply-To: <20091026172012.GC7233@duck.suse.cz> (Jan Kara's message of "Mon, 26 Oct 2009 18:20:12 +0100")
Jan Kara <jack@suse.cz> writes:
> Hi,
>
> I took time and remeasured tiobench results on recent kernel. A short
> conclusion is that there is still a performance regression which I reported
> few months ago. The machine is Intel 2 CPU with 2 GB RAM and plain SATA
> drive. tiobench sequential write performance numbers with 16 threads:
> 2.6.29: AVG STDERR
> 37.80 38.54 39.48 -> 38.606667 0.687475
>
> 2.6.32-rc5:
> 37.36 36.41 36.61 -> 36.793333 0.408928
>
> So about 5% regression. The regression happened sometime between 2.6.29 and
> 2.6.30 and stays the same since then... With deadline scheduler, there's
> no regression. Shouldn't we do something about it?
Background:
http://lkml.org/lkml/2009/5/28/415
Thanks for bringing this up again. I'll try to make some time to look
into it if others don't beat me to it.
Cheers,
Jeff
next prev parent reply other threads:[~2009-10-26 17:27 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-26 17:20 Performance regression in IO scheduler still there Jan Kara
2009-10-26 17:26 ` Jeff Moyer [this message]
2009-11-05 20:10 ` Jeff Moyer
2009-11-05 23:00 ` Corrado Zoccolo
2009-11-06 14:14 ` Jeff Moyer
2009-11-10 18:37 ` Jan Kara
2009-11-06 18:56 ` Jeff Moyer
2009-11-08 17:01 ` Corrado Zoccolo
2009-11-10 16:47 ` Jeff Moyer
2009-11-10 17:37 ` Corrado Zoccolo
2009-11-11 14:10 ` Jan Kara
2009-11-11 17:43 ` Jeff Moyer
2009-11-12 17:29 ` Jan Kara
2009-11-12 20:44 ` Jeff Moyer
2009-11-12 21:00 ` Jens Axboe
2009-11-12 21:05 ` Jeff Moyer
2009-11-13 7:45 ` Jens Axboe
2009-11-16 10:47 ` Jan Kara
2009-11-16 16:58 ` Jan Kara
2009-11-16 17:03 ` Jeff Moyer
2009-11-16 18:38 ` Corrado Zoccolo
2009-11-16 22:17 ` Jan Kara
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