linux-kernel - Re: [BUG] Something goes wrong with timer statistics.

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Message-Id: <20070529.160338.51845499.davem@davemloft.net>
Date:	Tue, 29 May 2007 16:03:38 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	iank@...dband.net
Cc:	michal.k.k.piotrowski@...il.com, Linux-kernel@...r.kernel.org
Subject: Re: [BUG] Something goes wrong with timer statistics.

From: Ian Kumlien <iank@...dband.net>
Date: Wed, 30 May 2007 00:51:52 +0200

> On tis, 2007-05-29 at 15:44 -0700, David Miller wrote:
> > From: "Michal Piotrowski" <michal.k.k.piotrowski@...il.com>
> > Date: Wed, 30 May 2007 00:41:46 +0200
> > 
> > > On 30/05/07, David Miller <davem@...emloft.net> wrote:
> > > > From: Ian Kumlien <iank@...dband.net>
> > > > Date: Tue, 29 May 2007 23:38:48 +0200
> > > >
> > > > > As the daystar sets, i try to play some with my new would be
> > > > > firewall/server, but since this will be running for quite some time i
> > > > > have been experimenting with powertop to find out what i can do to limit
> > > > > it's power usage.
> > > > >
> > > > > But, if i run powertop for too long or a few times to many... this
> > > > > happens:
> > > > > http://pomac.netswarm.net/pics/kernel_panic.jpg
> > > > >
> > > > > If i don't run powertop, it is rock solid... Compiling for hours,
> > > > > running memtest for hours etc etc...
> > > >
> > > > I see this same exact problem on sparc64.
> > > 
> > > Have you tried this patch?
> > > http://lkml.org/lkml/2007/5/29/392
> > 
> > Of course, I worked with Thomas on the fix :-)
> 
> I dunno if this applies to me, i run a 32 bit userspace...

That patch fixes a problem on 64-bit kernels, regardless of
userspace, when NOHZ is enabled.
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