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Date: Mon, 16 Feb 2009 10:21:00 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Damien Wyart <damien.wyart@free.fr>
Cc: 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: <20090216092100.GH6182@elte.hu>
References: <rjPbZ5GRJPO.A.1kE.ur0lJB@chimera> <20090215080941.GA2295@localhost.localdomain> <20090215090026.GA31147@elte.hu> <20090215095128.GA3234@localhost.localdomain> <20090215101351.GA23274@elte.hu> <20090215103445.GA2335@localhost.localdomain> <20090215110104.GB31351@elte.hu> <20090215180355.GA2273@localhost.localdomain> <20090215193102.GA16873@elte.hu> <20090216084223.GA2641@localhost.localdomain>
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* Damien Wyart <damien.wyart@free.fr> wrote:

> > Does it find any TSC time warps?
> 
> Seems not.

ok, it's indeed pretty conclusive:

|  2 CPUs, running 2 parallel test-tasks.
|  checking for time-warps via:
|  - read time stamp counter (RDTSC) instruction (cycle resolution)
| 
|   | TSC: 0.32us, fail:0 |

i suspect you ran it for at least a couple of minutes, and the ksoftirqd 
anomaly occured during it, right?

	Ingo