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Date: Mon, 9 Jun 2008 13:41:32 +0200
From: Ingo Molnar <mingo@elte.hu>
To: =?iso-8859-1?Q?N=E9meth_M=E1rton?= <nm127@freemail.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [regression][bisected] ~90,000 wakeups as of 2.6.26-rc3
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* 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