Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932079AbVLHWvS (ORCPT ); Thu, 8 Dec 2005 17:51:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932694AbVLHWvS (ORCPT ); Thu, 8 Dec 2005 17:51:18 -0500 Received: from mx2.suse.de ([195.135.220.15]:34278 "EHLO mx2.suse.de") by vger.kernel.org with ESMTP id S932079AbVLHWvP (ORCPT ); Thu, 8 Dec 2005 17:51:15 -0500 Date: Thu, 8 Dec 2005 23:51:02 +0100 From: Andi Kleen To: Christoph Lameter Cc: Andi Kleen , akpm@osdl.org, Christoph Hellwig , linux-ia64@vger.kernel.org, steiner@sgi.com, linux-kernel@vger.kernel.org, Wu Fengguang , discuss@x86-64.org Subject: Re: [PATCH 1/3] Zone reclaim V3: main patch Message-ID: <20051208225102.GW11190@wotan.suse.de> References: <20051208203707.30456.57439.sendpatchset@schroedinger.engr.sgi.com> <20051208210850.GS11190@wotan.suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 927 Lines: 23 > For Altix 20 means that the other node is remote but in the same > enclosure / motherboard. Latency is very low in these cases. I think in > these small configurations it is better to go off node rather than using > the reclaim logic. On Opterons the NUMA factors are usually < 2, more towards 1, but people definitely note a difference between node and off node. So I don't think that's a good heuristic. I would use > LOCAL_DISTANCE or perhaps if you really want a new constant with value 12-15. > RECLAIM_DISTANCE can be set per arch if the default is not okay. Well if anything it would be per system - perhaps need to make it a boot option or somesuch later. -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/