From: William Lee Irwin III <wli@holomorphy.com>
To: Tom Sightler <ttsig@tuxyturvy.com>
Cc: Ingo Molnar <mingo@elte.hu>, Mike Galbraith <efault@gmx.de>,
Andrew Morton <akpm@digeo.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: Strange load issues with 2.5.69/70 in both -mm and -bk trees.
Date: Mon, 2 Jun 2003 08:53:45 -0700 [thread overview]
Message-ID: <20030602155345.GR8978@holomorphy.com> (raw)
In-Reply-To: <1054568875.3545.34.camel@iso-8590-lx.zeusinc.com>
On Mon, Jun 02, 2003 at 11:47:56AM -0400, Tom Sightler wrote:
> In trying to figure out why this might be worse under 2.5 I took some
> simple vmstat numbers under 2.4 and 2.5, this biggest difference is the
> number of context switches. Under 2.4, with the page loaded, but
> otherwise idle, the system averages around 700/sec, and when I mouse
> around the page I get 2000-3000/sec.
> However, under 2.5, as I reported previously, I get 2000/sec all the
> time, and 3000-4000 as I mouse around the page.
> Would this be expected behavior? Does 2.5 do something that would cause
> more context switches that 2.4? I have no idea if this would have any
> impact at all, but it was the only difference I could observe in my
> fairly simple testing of the two kernels.
A quick patch to register profile hit counts for codepaths calling
schedule() and/or yield() appears to be in order for such occasions.
-- wli
next prev parent reply other threads:[~2003-06-02 15:40 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <5.2.0.9.2.20030601084615.00ce6e30@pop.gmx.net>
2003-06-01 17:43 ` Strange load issues with 2.5.69/70 in both -mm and -bk trees Tom Sightler
2003-06-02 7:39 ` Ingo Molnar
2003-06-02 14:30 ` Tom Sightler
2003-06-02 15:24 ` Tom Sightler
2003-06-02 15:47 ` Tom Sightler
2003-06-02 15:53 ` William Lee Irwin III [this message]
2003-06-01 4:23 Tom Sightler
2003-06-01 4:45 ` Andrew Morton
2003-06-01 17:36 ` Tom Sightler
2003-06-01 20:07 ` Andrew Morton
2003-06-02 1:59 ` Tom Sightler
2003-06-02 7:36 ` Ingo Molnar
2003-06-02 13:36 ` Tom Sightler
2003-06-02 15:14 ` Ingo Molnar
2003-06-02 15:24 ` Arjan van de Ven
2003-06-02 15:25 ` Ingo Molnar
2003-06-02 15:32 ` Tom Sightler
2003-06-02 17:28 ` Ingo Molnar
2003-06-02 19:27 ` Tom Sightler
2003-06-02 22:49 ` Rob Landley
2003-06-04 8:14 ` Mike Galbraith
2003-06-04 15:08 ` Tom Sightler
2003-06-04 15:12 ` Ingo Molnar
2003-06-04 16:00 ` Tom Sightler
2003-06-04 16:05 ` Mike Galbraith
2003-06-02 20:53 ` Andreas Boman
2003-06-02 23:10 ` Valdis.Kletnieks
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