linux-kernel - Re: Serious performance regression in Wine applications and Linux 2.6.24.*

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Message-ID: <20080327091711.GD30918@elte.hu>
Date:	Thu, 27 Mar 2008 10:17:14 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Kai <epimetreus@...tmail.fm>
Cc:	Ray Lee <ray-lk@...rabbit.org>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>
Subject: Re: Serious performance regression in Wine applications and Linux
	2.6.24.*


* Kai <epimetreus@...tmail.fm> wrote:

> The issue only shows with Age of Wonders II and AoW Shadow Magic.
> 
> Every version of wine from 0.9.55 to 0.9.58, including several 
> intermediate git builds.
> 
> Xorg version 1.4.0.90, and a couple other versions (the problems has 
> persisted across a couple updates of Xorg)
> 
> Hardware rendering; using the prop. nV driver; updating that also 
> doesn't affect the issue, nor does retaining the same version.

could you run this script while such a slowdown is really prominent:

  http://people.redhat.com/mingo/cfs-scheduler/tools/cfs-debug-info.sh

and send me the output it generates? The output is the most useful if 
you do this on a kernel that has CONFIG_SCHED_DEBUG=y and 
CONFIG_SCHEDSTATS=y enabled.

on the off chance that this issue has been fixed in the soon-to-be 
2.6.25 kernel, you might also want to try x86.git/latest, which is based 
on the latest Linus tree and has all relevant x86 fixes and improvements 
added as well:

  http://people.redhat.com/mingo/x86.git/README

several of the changes can affect performance.

a third (and most comprehensive) way to debug this would be to send me a 
scheduler trace of such a slowdown, you can generate a scheduler trace 
the following way:

  http://people.redhat.com/mingo/sched-devel.git/readme-tracer.txt

but we can probably give a first estimation based on the cfs-debug-info 
output already. Btw., you can combine the scheduler and the x86 git tree 
into a temporary unified tree by doing these two commands:

  git-checkout -b tmp x86/latest
  git-merge sched-devel/latest

(run "make oldconfig" to pick up the new config options.)

	Ingo
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