Re: [PATCH] perf: fix assertion failure in x86_pmu_start()

[Stephane Eranian]

On Tue, Feb 7, 2012 at 12:24 PM, Eric Dumazet <eric.dumazet@xxxxxxxxx> wrote:
> Le mardi 07 fÃvrier 2012 Ã 11:40 +0100, Stephane Eranian a Ãcrit :
>> Eric,
>>
>> How do you deal with that:
>>
>> [ Â Â0.019998] Performance Events: PEBS fmt0+, Core2 events, Broken
>> BIOS detected, complain to your hardware vendor.
>> [ Â Â0.019998] [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.
>
>
Yeah, it's an old problem (> 4years). And if I recall correctly, there
is no option in
the BIOS to turn it off. You'd have to talk to HP directly.
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