linux-kernel - Re: [FALSE ALARM] Re: HPET (?) related hangs and breakage in 2.6.35,36

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Date:	Thu, 11 Nov 2010 12:06:42 +0100
From:	"Roedel, Joerg" <Joerg.Roedel@....com>
To:	Borislav Petkov <bp@...64.org>
CC:	Andrew Lutomirski <luto@....edu>,
	Clemens Ladisch <clemens@...isch.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	x86 <x86@...nel.org>
Subject: Re: [FALSE ALARM] Re: HPET (?) related hangs and breakage in
 2.6.35,36

On Wed, Nov 10, 2010 at 01:50:31PM -0500, Borislav Petkov wrote:
> On Wed, Nov 10, 2010 at 01:48:00PM -0500, Andrew Lutomirski wrote:
> > > Clocksource: tsc unstable (delta = -34355296774 ns)
> > > Switching: to clocksource hpet
> > 
> > Please disregard -- this is a bug in nouveau (or drm) not hpet.  I'll
> > send a bug report to the maintainers.
> 
> Interesting! Joerg was complaining about similar symptoms with .36 today
> too.

The issue I have seen was on two boxes with 890FX chipset and Phenom II
X6 CPUs on a recent avi/master which was 2.6.36 + some kvm patches.

The problem was that the box became extremly sluggish and slow. I stated
dstat and it reported a lot of missed ticks. After some time the
clocksource tsc became unstable and the system became responsive again.
I have not yet investigated this further but can do any requested tests.

	Joerg

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