Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261397AbVAMU05 (ORCPT ); Thu, 13 Jan 2005 15:26:57 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261519AbVAMUXi (ORCPT ); Thu, 13 Jan 2005 15:23:38 -0500 Received: from one.firstfloor.org ([213.235.205.2]:57539 "EHLO one.firstfloor.org") by vger.kernel.org with ESMTP id S261383AbVAMTik (ORCPT ); Thu, 13 Jan 2005 14:38:40 -0500 To: sander@humilis.net Cc: "Sergey S. Kostyliov" , linux-kernel@vger.kernel.org Subject: Re: NUMA or not on dual Opteron References: <200501121824.44327.rathamahata@ehouse.ru> <20050113094537.GB2547@favonius> From: Andi Kleen Date: Thu, 13 Jan 2005 20:38:33 +0100 In-Reply-To: <20050113094537.GB2547@favonius> (sander@humilis.net's message of "Thu, 13 Jan 2005 10:45:37 +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: 1108 Lines: 31 Sander writes: > 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? I don't know who gave you this impression, but it's wrong. Using a NUMA aware kernel is an advantage under many workloads on a 2way Opteron system. > > In other words: why should one want NUMA to be enabled or disabled for > dual Opteron? Because it is faster. -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/