Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261402AbVAMTqv (ORCPT ); Thu, 13 Jan 2005 14:46:51 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261464AbVAMToG (ORCPT ); Thu, 13 Jan 2005 14:44:06 -0500 Received: from one.firstfloor.org ([213.235.205.2]:58563 "EHLO one.firstfloor.org") by vger.kernel.org with ESMTP id S261402AbVAMTkr (ORCPT ); Thu, 13 Jan 2005 14:40:47 -0500 To: Raphael Jacquot Cc: Kernel Mailing List , "Sergey S. Kostyliov" Subject: Re: NUMA or not on dual Opteron References: <200501121824.44327.rathamahata@ehouse.ru> <20050113094537.GB2547@favonius> <41E6472B.5020701@imag.fr> From: Andi Kleen Date: Thu, 13 Jan 2005 20:40:46 +0100 In-Reply-To: <41E6472B.5020701@imag.fr> (Raphael Jacquot's message of "Thu, 13 Jan 2005 11:02:19 +0100") Message-ID: User-Agent: Gnus/5.110002 (No Gnus v0.2) Emacs/21.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 844 Lines: 20 Raphael Jacquot writes: > > 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 . [just for the record to avoid wrong information in the archives] No, that's wrong. Opteron is CC (cache coherent)/NUMA, like most modern NUMA systems. CC/NUMA tends to be fully transparent, this means the system can be run like a SMP. Just it's faster to be NUMA aware. -Andi - 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/