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SubjectRe: [regression][bisected] ~90,000 wakeups as of 2.6.26-rc3

* Németh Márton <nm127@freemail.hu> wrote:

> Hi,
>
> there is a problem in 2.6.26-rc3 which was not there in case of
> 2.6.25: the CPU wakes up ~90,000 times per sec instead of ~60 per sec.
>
> I also "git bisected" the problem, the result is:
>
> 6e908947b4995bc0e551a8257c586d5c3e428201 is first bad commit
> commit 6e908947b4995bc0e551a8257c586d5c3e428201
> Author: Ingo Molnar <mingo@elte.hu>
> Date: Fri Mar 21 14:32:36 2008 +0100
>
> x86: fix ioapic bug again

thanks for tracking this down. Could you check whether the problem is
also fixed in latest -tip? In particular the tip/x86/apic branch should
properly solve this. You can pick up -tip via:

http://people.redhat.com/mingo/tip.git/README

but those tip/x86/apic fixes are too intrusive for v2.6.26, so i've
queued up your revert into tip/x86/urgent, for v2.6.26 merging. Would be
nice if you could check -tip though, to make sure we dont reintroduce
the same problem again in v2.6.27.

Ingo
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