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

Sedat Dilek
2010-11-23T18:29:25Z

On Tue, Nov 23, 2010 at 7:27 PM, Peter Zijlstra <peterz@infradead.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