linux-kernel - Re: 2.6.24-git4+ regression

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Message-Id: <1202124997.32654.78.camel@lappy>
Date:	Mon, 04 Feb 2008 12:36:36 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Lukas Hejtmanek <xhejtman@....muni.cz>
Cc:	Ingo Molnar <mingo@...e.hu>, mingo@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.24-git4+ regression


On Mon, 2008-02-04 at 12:17 +0100, Lukas Hejtmanek wrote:
> Ingo,
> 
> any progress here? I've tried to revert this patch:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=67e9fb2a39a1d454218d50383094940982be138f
> 
> as it was marked as suspicious patch in this case
> (http://www.uwsg.indiana.edu/hypermail/linux/kernel/0801.3/1665.html)
> 
> but in such a case, kernel 2.6.24-git13 does oops at startup in sched_slice.
> 
> I think this is really *big* regression in 2.6.24 kernel.

I can't reproduce this with a pure cpu load. I started 10 
  while :; do :; done &
instances and aside from slowing down, nothing bad happened.

May I suggest you try latency top to see if there is something in your
build scenario that generates horrible latencies (some IO path or
whatnot).

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