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Date:	Tue, 22 Jul 2014 12:38:57 +0200
From:	Peter Zijlstra <>
To:	Bruno Wolff III <>
Cc:	Dietmar Eggemann <>,
	Josh Boyer <>,
	"" <>,
	"" <>,
	"H. Peter Anvin" <>,
	Thomas Gleixner <>
Subject: Re: Scheduler regression from

On Tue, Jul 22, 2014 at 11:47:40AM +0200, Peter Zijlstra wrote:
> On Mon, Jul 21, 2014 at 06:52:12PM +0200, Peter Zijlstra wrote:
> > On Mon, Jul 21, 2014 at 11:35:28AM -0500, Bruno Wolff III wrote:
> > > Is there more I can do to help with this now? Or should I just wait for
> > > patches to test?
> > 
> > Yeah, sorry, was wiped out today. I'll go stare harder at the P4
> > topology setup code tomorrow. Something fishy there.
> Does this make your machine boot again (while giving an error)?
> It tries to robustify the topology setup a bit, crashing on crap input
> should be avoided if possible of course.
> I'll go stare at the x86/P4 topology code like promised.

Could you provide the output of cpuid and cpuid -r for your machine?
This code is magic and I've no idea what your machine is telling it to
do :/

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