From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758906AbYDALlJ (ORCPT ); Tue, 1 Apr 2008 07:41:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757534AbYDALk4 (ORCPT ); Tue, 1 Apr 2008 07:40:56 -0400 Received: from smtp-out03.alice-dsl.net ([88.44.63.5]:5334 "EHLO smtp-out03.alice-dsl.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757478AbYDALkz (ORCPT ); Tue, 1 Apr 2008 07:40:55 -0400 To: Hidetoshi Seto Cc: linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/2] Customize sched domain via cpuset References: <47F21BE3.5030705@jp.fujitsu.com> From: Andi Kleen Date: 01 Apr 2008 13:40:50 +0200 In-Reply-To: <47F21BE3.5030705@jp.fujitsu.com> Message-ID: <87zlsdzttp.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 X-OriginalArrivalTime: 01 Apr 2008 11:34:13.0397 (UTC) FILETIME=[4F69FC50:01C893EC] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hidetoshi Seto writes: > Using cpuset, now we can partition the system into multiple sched domains. > Then, how about providing different characteristics for each domains? Did you actually see much improvement in any relevant workload from tweaking these parameters? If yes what did you change? And how much did it gain? Ideally the kernel should perform well without much tweaking out of the box, simply because most users won't tweak. Adding a lot of such parameters would imply giving up on good defaults which is not a good thing. -Andi