From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752080AbZIHWAt (ORCPT ); Tue, 8 Sep 2009 18:00:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751542AbZIHWAs (ORCPT ); Tue, 8 Sep 2009 18:00:48 -0400 Received: from mail-in-14.arcor-online.net ([151.189.21.54]:49838 "EHLO mail-in-14.arcor-online.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751089AbZIHWAr (ORCPT ); Tue, 8 Sep 2009 18:00:47 -0400 X-DKIM: Sendmail DKIM Filter v2.8.2 mail-in-16.arcor-online.net AEF9B25729D Message-ID: <4AA6D40F.6040600@arcor.de> Date: Wed, 09 Sep 2009 01:00:47 +0300 From: Nikos Chantziaras Organization: Lucas Barks User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.1) Gecko/20090826 Thunderbird/3.0b3 MIME-Version: 1.0 To: Juergen Beisert CC: linux-kernel@vger.kernel.org, Arjan van de Ven Subject: Re: BFS vs. mainline scheduler benchmarks and measurements References: <20090906205952.GA6516@elte.hu> <20090908013800.296a5fb5@infradead.org> <4AA62E4E.4040700@arcor.de> <200909081332.46129.jbe@pengutronix.de> In-Reply-To: <200909081332.46129.jbe@pengutronix.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/08/2009 02:32 PM, Juergen Beisert wrote: > On Dienstag, 8. September 2009, Nikos Chantziaras wrote: >> On 09/08/2009 11:38 AM, Arjan van de Ven wrote: >>> On Tue, 08 Sep 2009 10:19:06 +0300 >>> >>> Nikos Chantziaras wrote: >>>> latencytop has this to say: >>>> >>>> http://foss.math.aegean.gr/~realnc/pics/latop1.png >>>> >>>> Though I don't really understand what this tool is trying to tell me, >>>> I hope someone does. >>> >>> despite the untranslated content, it is clear that you have scheduler >>> delays (either due to scheduler bugs or cpu contention) of upto 68 >>> msecs... Second in line is your binary AMD graphics driver that is >>> chewing up 14% of your total latency... >> >> I've now used a correctly installed and up-to-date version of latencytop >> and repeated the test. Also, I got rid of AMD's binary blob and used >> kernel DRM drivers for my graphics card to throw fglrx out of the >> equation (which btw didn't help; the exact same problems occur). >> >> Here the result: >> >> http://foss.math.aegean.gr/~realnc/pics/latop2.png >> >> Again: this is on an Intel Core 2 Duo CPU. > > Just an idea: Maybe some system management code hits you? I'm not sure what is meant with "system management code."