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    SubjectRe: [PATCH] perf: fix assertion failure in x86_pmu_start()
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    On Tue, Feb 7, 2012 at 12:24 PM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
    > 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.
    >
    >
    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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