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

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Date:	Tue, 11 Aug 2009 17:40:06 +0200
From:	Johannes Stezenbach <js@...21.net>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Robert Richter <robert.richter@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	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

On Tue, Aug 11, 2009 at 12:13:07AM +0200, Johannes Stezenbach wrote:
> On Mon, Aug 10, 2009 at 11:31:33PM +0200, Ingo Molnar wrote:
> > * Johannes Stezenbach <js@...21.net> wrote:
> > > 
> > > Could the warning be caused by the cpufreq ondemand governor? ISTR 
> > > that one should switch to the performance governor before doing 
> > > any profiling, but I forgot for this test.
> > 
> > there might be a connection - it could in theory cause sched_clock() 
> > transients and confuse the ring-buffer time-stamping.
> 
> I'll try tomorrow after a fresh boot if the warning also appears
> with the performance governor.

Nope, cpufreq was not the culprit.  The "Delta way too big!"
warning in rb_reserve_next_event() happens after suspend-to-RAM.


Johannes
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