linux-kernel - Re: 2.6.31-rc5 regression: x86 MCE malfunction on Thinkpad T42p

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Message-ID: <20090810132923.GA4418@elte.hu>
Date:	Mon, 10 Aug 2009 15:29:23 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Johannes Stezenbach <js@...21.net>
Cc:	Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: 2.6.31-rc5 regression: x86 MCE malfunction on Thinkpad T42p


* Johannes Stezenbach <js@...21.net> wrote:

> On Mon, Aug 10, 2009 at 02:32:28PM +0200, Andi Kleen wrote:
> > > > The appended patch should remove the warning. Can you please test it?
> > > 
> > > It works (no more warning), but I feel I'm better off using "lapic"
> > 
> > Thanks for testing.
> > 
> > > because it enables thermal monitoring and performance counters.
> > 
> > When the BIOS doesn't enable it then force enabling lapic might not work.
> > 
> > This could cause either boot failures (obvious) or more subtle 
> > problems like SMM doing something unexpected. Just saying that 
> > if you have strange problems later first try disabling this 
> > option again.
> 
> Thanks for the heads-up.  I remember I tried to use oprofile in 
> the past on this machine and was disappointed that it only got the 
> timer event.  I'll keep lapic for now unless I see signs of 
> instability.

What's the output of something like 'perf stat true', and does 'perf 
top' output something - i.e. do perfcounters work in general? Once 
you get to that stage and it works then it should be fine.

	Ingo
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