From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965062AbWBGMtX (ORCPT ); Tue, 7 Feb 2006 07:49:23 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965063AbWBGMtX (ORCPT ); Tue, 7 Feb 2006 07:49:23 -0500 Received: from ns1.suse.de ([195.135.220.2]:51170 "EHLO mx1.suse.de") by vger.kernel.org with ESMTP id S965062AbWBGMtX (ORCPT ); Tue, 7 Feb 2006 07:49:23 -0500 From: Andi Kleen To: Ingo Molnar , steiner@sgi.com Subject: Re: [PATCH 1/5] cpuset memory spread basic implementation Date: Tue, 7 Feb 2006 13:43:58 +0100 User-Agent: KMail/1.8.2 Cc: Paul Jackson , clameter@engr.sgi.com, akpm@osdl.org, dgc@sgi.com, Simon.Derr@bull.net, linux-kernel@vger.kernel.org References: <20060204071910.10021.8437.sendpatchset@jackhammer.engr.sgi.com> <200602071314.34879.ak@suse.de> <20060207123001.GA634@elte.hu> In-Reply-To: <20060207123001.GA634@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200602071343.59384.ak@suse.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tuesday 07 February 2006 13:30, Ingo Molnar wrote: > you are a bit biased towards low-latency NUMA setups i guess (read: > Opterons) :-) Well they are the vast majority of NUMA systems Linux runs on. And there are more than just Opterons, e.g. IBM Summit. And even the majority of Altixes are not _that_ big. Of course we need to deal somehow with the big systems, but for the good defaults the smaller systems are more important. Big systems tend to have capable administrators who are willing to tweak them. But that's rarely the case with the small systems. So I think as long as the big system can be somehow made to work with special configuration and ignoring corner cases that's fine. But for the low NUMA systems it should perform as well as possibly out of the box. > Obviously with a low NUMA factor, we dont have to deal > with memory access assymetries all that much. That is why I proposed "nearby policy". It can turn a system with a large NUMA factor into a system with a small NUMA factor. -Andi