linux-kernel - Re: [PATCH] x86, perf, nmi: Disable perf if counters are not accessable

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Message-ID: <AANLkTikOub+x1oo8Cv7hBHgLPF9vjPfzmNwXzEvPPjRK@mail.gmail.com>
Date:	Tue, 23 Nov 2010 19:29:20 +0100
From:	Sedat Dilek <sedat.dilek@...glemail.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Don Zickus <dzickus@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86, perf, nmi: Disable perf if counters are not accessable

On Tue, Nov 23, 2010 at 7:27 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Tue, 2010-11-23 at 19:21 +0100, Sedat Dilek wrote:
>> Due to BIOS l(ocal)apic is not possible:
>>
>> # dmesg | grep -i apic
>> [    0.000000] Using APIC driver default
>> [    0.000000] Local APIC disabled by BIOS -- you can enable it with "lapic"
>> [    0.000000] APIC: disable apic facility
>> [    0.000000] APIC: switched to apic NOOP
>> [    0.008891] no APIC, boot with the "lapic" boot parameter to force-enable it.
>> [    0.036141] Local APIC not detected. Using dummy APIC emulation.
>
> Have you tried booting with "lapic" as the second last msg suggests you
> do?
>

Yes, I did try before there was [1], booting with "lapic" had no effect.

- Sedat -

[1] bugfix/x86/Skip-looking-for-ioapic-overrides-when-ioapics-are-not-present.patch
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