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Date: Mon, 16 Feb 2009 21:09:23 +0100
From: Ingo Molnar <mingo@elte.hu>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Damien Wyart <damien.wyart@free.fr>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>, Mike Galbraith <efault@gmx.de>,
       =?iso-8859-1?Q?Fr=E9d=E9ric?= Weisbecker <fweisbec@gmail.com>,
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       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Kernel Testers List <kernel-testers@vger.kernel.org>
Subject: Re: [Bug #12650] Strange load average and ksoftirqd behavior with
	2.6.29-rc2-git1
Message-ID: <20090216200923.GA28938@elte.hu>
References: <20090215180355.GA2273@localhost.localdomain> <20090215193102.GA16873@elte.hu> <20090216084223.GA2641@localhost.localdomain> <20090216095059.GL6182@elte.hu> <87hc2u61e9.fsf@free.fr> <20090216122632.GA3158@elte.hu> <87ljs6pmao.fsf@free.fr> <20090216132151.GA17996@elte.hu> <20090216160613.GA6785@linux.vnet.ibm.com> <20090216185616.GB6785@linux.vnet.ibm.com>
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* Paul E. McKenney <paulmck@linux.vnet.ibm.com> wrote:

> Here the calls to rcu_process_callbacks() are only 75 
> microseconds apart, so that this function is consuming more 
> than 10% of a CPU.  The strange thing is that I don't see a 
> raise_softirq() in between, though perhaps it gets inlined or 
> something that makes it invisible to ftrace.

look at the latest trace please, that has even the most inline 
raise-softirq method instrumented, so all the raising is 
visible.

	Ingo