From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264365AbUEYAaZ (ORCPT ); Mon, 24 May 2004 20:30:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264367AbUEYAaZ (ORCPT ); Mon, 24 May 2004 20:30:25 -0400 Received: from lvs00-fl-n13.valueweb.net ([216.219.253.195]:59332 "EHLO ams013.ftl.affinity.com") by vger.kernel.org with ESMTP id S264365AbUEYAaY (ORCPT ); Mon, 24 May 2004 20:30:24 -0400 Message-ID: <40B292DD.5060500@coyotegulch.com> Date: Mon, 24 May 2004 20:27:09 -0400 From: Scott Robert Ladd User-Agent: Mozilla Thunderbird 0.6 (X11/20040522) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Andrew Theurer CC: Andi Kleen , "Bryan O'Sullivan" , brettspamacct@fastclick.com, "Martin J. Bligh" , linux-kernel@vger.kernel.org Subject: Re: How can I optimize a process on a NUMA architecture(x86-64 specifically)? References: <1Y6yr-eM-11@gated-at.bofh.it> <1085272089.25212.6.camel@obsidian.pathscale.com> <20040523142806.GA33866@colin2.muc.de> <200405241700.57249.habanero@us.ibm.com> In-Reply-To: <200405241700.57249.habanero@us.ibm.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Andrew Theurer wrote: > FYI Brett, some Opteron systems have a BIOS option to interleave memory. If > you are going to make use of NUMA, I think you want to not interleave. I can confirm this. On my Tyan Thunder K8W 2885 (dual Opteron), I had to disable interleaving (under the Northbridge setup) before Linux recognized it as a NUMA system. -- Scott Robert Ladd Coyote Gulch Productions (http://www.coyotegulch.com) Software Invention for High-Performance Computing