From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261537AbVDDEiR (ORCPT ); Mon, 4 Apr 2005 00:38:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261983AbVDDEiR (ORCPT ); Mon, 4 Apr 2005 00:38:17 -0400 Received: from omx2-ext.sgi.com ([192.48.171.19]:12194 "EHLO omx2.sgi.com") by vger.kernel.org with ESMTP id S261537AbVDDEiL (ORCPT ); Mon, 4 Apr 2005 00:38:11 -0400 Date: Sun, 3 Apr 2005 21:36:36 -0700 From: Paul Jackson To: Andy Lutomirski Cc: kenneth.w.chen@intel.com, torvalds@osdl.org, nickpiggin@yahoo.com.au, akpm@osdl.org, linux-kernel@vger.kernel.org Subject: Re: [patch] sched: auto-tune migration costs [was: Re: Industry db benchmark result on recent 2.6 kernels] Message-Id: <20050403213636.05cddf52.pj@engr.sgi.com> In-Reply-To: <4250C19F.9070801@myrealbox.com> References: <200504020100.j3210fg04870@unix-os.sc.intel.com> <20050402145351.GA11601@elte.hu> <20050402215332.79ff56cc.pj@engr.sgi.com> <20050403070415.GA18893@elte.hu> <20050403043420.212290a8.pj@engr.sgi.com> <4250C19F.9070801@myrealbox.com> Organization: SGI X-Mailer: Sylpheed version 1.0.0 (GTK+ 1.2.10; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Andy wrote: > Not that I really know what I'm talking about here, but this sounds > highly parallelizable. I doubt it. If we are testing the cost of a migration between CPUs alpha and beta, and at the same time testing betweeen CPUs gamma and delta, then often there will be some hardware that is shared by both the path, and the path. This would affect the test results. -- I won't rest till it's the best ... Programmer, Linux Scalability Paul Jackson 1.650.933.1373, 1.925.600.0401