On Thu, 2006-10-05 at 22:57 +0200, Andi Kleen wrote:
> > ah, that's still the VAIO, right? Do you get a 'slow' LOC count on
> > /proc/interrupts even on a stock kernel? If yes then that's a
> > fundamentally sick local APIC timer interrupt. Stock kernel should show
> > sickness too, if for example you boot an SMP kernel on it - can you
> > confirm that? (the UP-IOAPIC only relies for profiling on the lapic
> > timer, so there the only sickness you should see on the stock kernel is
> > a non-working readprofile)
>
> When I was hacking on my old noidletick patch I ran into this
> problem on several machines too.
>
> But usually the problem wasn't that it was too slow, but that
> it completely stopped in C2 or deeper. I don't think there
> is a way to work around that except for not using C2 or deeper
> (not an option) or using a different timer source.
>
> If that is true then hitting space lots of time will make it
> go faster.
If that's the case we can even autodetect it and stay with PIT and
ignore lapic all the way.
tglx
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