Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932429AbXHCPNs (ORCPT ); Fri, 3 Aug 2007 11:13:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932173AbXHCPNk (ORCPT ); Fri, 3 Aug 2007 11:13:40 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:50654 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932153AbXHCPNk (ORCPT ); Fri, 3 Aug 2007 11:13:40 -0400 Date: Fri, 3 Aug 2007 17:13:33 +0200 From: Ingo Molnar To: "T. J. Brumfield" Cc: linux-kernel@vger.kernel.org Subject: Re: about modularization Message-ID: <20070803151333.GB13619@elte.hu> References: <20070803131900.GA26203@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.14 (2007-02-12) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: 1.0 X-ELTE-SpamLevel: s X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=1.0 required=5.9 tests=BAYES_50 autolearn=no SpamAssassin version=3.0.3 1.0 BAYES_50 BODY: Bayesian spam probability is 40 to 60% [score: 0.5000] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1373 Lines: 30 * T. J. Brumfield wrote: > CFS is apparently better in its simplicity, however others are > reporting that SD still provides benefits for 3D gaming. [...] even for 3D gaming the opposite of what you say seems to be the case: http://people.redhat.com/mingo/misc/cfs-sd-ut2004-perf.jpg http://people.redhat.com/mingo/misc/cfs-vs-sd-wine-quake.jpg ( more such measurements were done and reported, i stopped doing graphs after the first two. ) but in any case, the main "target" of CFS was not even SD (although it is certainly desirable to handle any load at least as well as SD) but the _mainline_ scheduler. SD was the primary selection of a relatively small subset of existing Linux users, and SD had known (and intentional) tradeoffs over the mainline scheduler in certain areas. CFS tried to do zero tradeoffs over the existing scheduler, to not introduce regressions to the many users who found the existing scheduler just good enough. That's been a success so far, at the moment there's no open CFS "interactivity regression" relative to the 2.6.22 mainline scheduler. Ingo - 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/