linux-kernel - Re: [Bug #12650] Strange load average and ksoftirqd behavior with 2.6.29-rc2-git1

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Message-ID: <20090215095128.GA3234@localhost.localdomain>
Date:	Sun, 15 Feb 2009 10:51:28 +0100
From:	Damien Wyart <damien.wyart@...e.fr>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: [Bug #12650] Strange load average and ksoftirqd behavior with
	2.6.29-rc2-git1

> > Load average is between 0.30 and 0.60 when the machine is idle, the
> > two ksoftirqd threads get a very high total running time in top.
> > This is on a P4 machine. On a recent laptop, the load is not as
> > high, but the ksoftirqd threads also get a very high total running
> > time.

> Mind having a look at this anomaly with the function graph tracer? We are
> interested in a representative trace that shows the weird ksoftirq activities.
> [ which trace could possibly pinpoint their origin. ]

> Here's the tracing quickstart:

>    http://redhat.com/~mingo/tip.git/tracing-quickstart.txt

> Also attached below. Let me know if you have trouble getting a good trace,
> or if any of the steps were non-intuitive or burdensome to you.

Thanks for your feedback & explanations; I will try to have a look at
all this material asap, I think tomorrow.

Damien
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