Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261538AbVAMKCr (ORCPT ); Thu, 13 Jan 2005 05:02:47 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261546AbVAMKCr (ORCPT ); Thu, 13 Jan 2005 05:02:47 -0500 Received: from imag.imag.fr ([129.88.30.1]:5801 "EHLO imag.imag.fr") by vger.kernel.org with ESMTP id S261538AbVAMKCp (ORCPT ); Thu, 13 Jan 2005 05:02:45 -0500 Message-ID: <41E6472B.5020701@imag.fr> Date: Thu, 13 Jan 2005 11:02:19 +0100 From: Raphael Jacquot User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20050109 Fedora/1.7.5-3 X-Accept-Language: en-us, en MIME-Version: 1.0 To: sander@humilis.net CC: Kernel Mailing List , "Sergey S. Kostyliov" Subject: Re: NUMA or not on dual Opteron References: <200501121824.44327.rathamahata@ehouse.ru> <20050113094537.GB2547@favonius> In-Reply-To: <20050113094537.GB2547@favonius> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-1.4 (imag.imag.fr [129.88.30.1]); Thu, 13 Jan 2005 11:02:24 +0100 (CET) X-IMAG-MailScanner: Found to be clean X-IMAG-MailScanner-Information: Please contact the ISP for more information Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1198 Lines: 32 Sander wrote: > Linus Torvalds wrote (ao): > >>On Wed, 12 Jan 2005, Sergey S. Kostyliov wrote: >> >>>2.6.10-rc1 hangs at boot stage for my dual opteron machine >> >>Oops, yes. There's some recent NUMA breakage - either disable >>CONFIG_NUMA, or apply the patches that Andi Kleen just posted on the >>mailing list (the second option much preferred, just to verify that >>yes, that does fix it). > > > I was under the impression that NUMA is useful on > 2-way systems only. > Is this true, and if not, under what circumstances is NUMA useful on > 2-way Opteron systems? > > In other words: why should one want NUMA to be enabled or disabled for > dual Opteron? > > Thanks in advance. > Numa needs to be enabled on bi-opteron systems because each processor controls part of the memory. unlike the intel memory architecture, where processors share the same bus to access memory. Numa in opteron systems is thus required to allow sharing of memory . - 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/