linux-kernel - Re: [PATCH] perf: fix assertion failure in x86_pmu

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Date:	Tue, 07 Feb 2012 12:24:46 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	peterz@...radead.org, markus@...ppelsdorf.de, paulus@...ba.org
Subject: Re: [PATCH] perf: fix assertion failure in x86_pmu_start()

Le mardi 07 février 2012 à 11:40 +0100, Stephane Eranian a écrit :
> Eric,
> 
> How do you deal with that:
> 
> [    0.019998] Performance Events: PEBS fmt0+, Core2 events, Broken
> BIOS detected, complain to your hardware vendor.
> [    0.019998] [Firmware Bug]: the BIOS has corrupted hw-PMU resources
> (MSR 186 is 43003c)
> 
> Your BIOS is using a counter to count cycles for power savings tricks.
> That is conflicting
> with perf_events.

This was already discussed last year.

https://lkml.org/lkml/2011/3/24/552

Apparently all HP blades I have in my labs have the problem, whatever
option is chosen in BIOS.

On my machines, I set the BIOS to 'High performance', and cpus are on
highest available frequencies.



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