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

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Message-ID: <20090218003801.GD25856@elte.hu>
Date:	Wed, 18 Feb 2009 01:38:01 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Damien Wyart <damien.wyart@...e.fr>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>,
	"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


* Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:

> No, it was my confusion -- I later realized that your data 
> above meant that the force-quiescent-state code path was not 
> being heavily exercised. So no need for this trace!

Do you have any theory for why RCU was activated every 100-200 
microseconds, resulting in 20% ksoftirqd CPU use - and why the 
problem went away with classic-rcu?

	Ingo
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