To: "Kai" <epimetreus@fastmail.fm>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Serious performance regression in Wine applications and Linux 2.6.24.*
References: <1206310206.17373.1243881033@webmail.messagingengine.com>
From: Andi Kleen <andi@firstfloor.org>
Date: 24 Mar 2008 04:55:36 +0100
In-Reply-To: <1206310206.17373.1243881033@webmail.messagingengine.com>
Message-ID: <87tziw7p3b.fsf@basil.nowhere.org>
User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 951
Lines: 18

"Kai" <epimetreus@fastmail.fm> writes:

> Originally, it was just about everything -- Wine itself, and most any
> app I tried to run with it.
> 
> In my most recent tests, however, it only seems to affect Age of Wonders
> II and Age of Wonders Shadow Magic, which use very similar engines.

A simple test if the scheduler is likely to blame would be to compare
context switch rates between the different kernel versions who show
differing performance. You can do that with running "vmstat 1" in
parallel and checking the "cs" column.

Another powerful but quite slow method if you can easily reproduce it
would be a full git bisect. That would identify exactly which change
introduced your problem.

-Andi
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/