From: Eric Dumazet <eric.dumazet@gmail.com>
To: Stephane Eranian <eranian@google.com>
Cc: Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org, peterz@infradead.org,
markus@trippelsdorf.de, paulus@samba.org
Subject: Re: [PATCH] perf: fix assertion failure in x86_pmu_start()
Date: Tue, 07 Feb 2012 12:24:46 +0100 [thread overview]
Message-ID: <1328613886.3443.2.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC> (raw)
In-Reply-To: <CABPqkBRwjwG0i+J_Qzgm+khHRD+LiT60vMEQA3w1MtPq-FFKLw@mail.gmail.com>
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.
next prev parent reply other threads:[~2012-02-07 11:24 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-06 20:53 Stephane Eranian
2012-02-07 8:34 ` Eric Dumazet
2012-02-07 8:41 ` Ingo Molnar
2012-02-07 8:55 ` Eric Dumazet
2012-02-07 10:25 ` Eric Dumazet
2012-02-07 10:31 ` Stephane Eranian
2012-02-07 10:36 ` Eric Dumazet
2012-02-07 10:40 ` Stephane Eranian
2012-02-07 11:24 ` Eric Dumazet [this message]
2012-02-07 11:27 ` Stephane Eranian
2012-02-07 11:36 ` Ingo Molnar
2012-02-07 10:49 ` Ingo Molnar
2012-02-07 11:07 ` Stephane Eranian
2012-02-07 9:17 ` Stephane Eranian
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