Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750961AbWBGRHF (ORCPT ); Tue, 7 Feb 2006 12:07:05 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932123AbWBGRHF (ORCPT ); Tue, 7 Feb 2006 12:07:05 -0500 Received: from omx1-ext.sgi.com ([192.48.179.11]:19590 "EHLO omx1.americas.sgi.com") by vger.kernel.org with ESMTP id S1750961AbWBGRHD (ORCPT ); Tue, 7 Feb 2006 12:07:03 -0500 Date: Tue, 7 Feb 2006 09:06:47 -0800 (PST) From: Christoph Lameter To: Ingo Molnar cc: Andi Kleen , Paul Jackson , akpm@osdl.org, dgc@sgi.com, steiner@sgi.com, Simon.Derr@bull.net, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/5] cpuset memory spread basic implementation In-Reply-To: <20060207123001.GA634@elte.hu> Message-ID: References: <20060204071910.10021.8437.sendpatchset@jackhammer.engr.sgi.com> <200602071031.40346.ak@suse.de> <20060207115307.GA25110@elte.hu> <200602071314.34879.ak@suse.de> <20060207123001.GA634@elte.hu> 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: 909 Lines: 23 On Tue, 7 Feb 2006, Ingo Molnar wrote: > * Andi Kleen wrote: > > > I still don't really think it will make much difference if the file > > cache is local or global. Compare to disk IO it is still infinitely > > faster, so a relatively small slowdown from going off node is not that > > big an issue. > > well, maybe the SGI folks can give us some numbers? The latency may grow (average) by a factor of 4 (same thoughput though on our boxes). On some architectures it is significantly more and also the bandwidth is reduced. This is a significant factor. Applications that do not manage locality correctly loose at least 30-40% performance. - 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/