From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail190.messagelabs.com (mail190.messagelabs.com [216.82.249.51]) by kanga.kvack.org (Postfix) with ESMTP id 028C66B006A for ; Fri, 8 Oct 2010 12:59:42 -0400 (EDT) Received: from d03relay05.boulder.ibm.com (d03relay05.boulder.ibm.com [9.17.195.107]) by e35.co.us.ibm.com (8.14.4/8.13.1) with ESMTP id o98Gn6WB002931 for ; Fri, 8 Oct 2010 10:49:06 -0600 Received: from d03av02.boulder.ibm.com (d03av02.boulder.ibm.com [9.17.195.168]) by d03relay05.boulder.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id o98GxZE8094350 for ; Fri, 8 Oct 2010 10:59:36 -0600 Received: from d03av02.boulder.ibm.com (loopback [127.0.0.1]) by d03av02.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id o98GxXWd018900 for ; Fri, 8 Oct 2010 10:59:35 -0600 Date: Fri, 8 Oct 2010 22:29:30 +0530 From: Balbir Singh Subject: Re: [resend][PATCH] mm: increase RECLAIM_DISTANCE to 30 Message-ID: <20101008165930.GH5327@balbir.in.ibm.com> Reply-To: balbir@linux.vnet.ibm.com References: <20101008104852.803E.A69D9226@jp.fujitsu.com> <20101008090427.GB5327@balbir.in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org To: Christoph Lameter Cc: KOSAKI Motohiro , Mel Gorman , Rob Mueller , linux-kernel@vger.kernel.org, Bron Gondwana , linux-mm , David Rientjes List-ID: * Christoph Lameter [2010-10-08 10:45:16]: > On Fri, 8 Oct 2010, Balbir Singh wrote: > > > I am not sure if this makes sense, since RECLAIM_DISTANCE is supposed > > to be a hardware parameter. Could you please help clarify what the > > access latency of a node with RECLAIM_DISTANCE 20 to that of a node > > with RECLAIM_DISTANCE 30 is? Has the hardware definition of reclaim > > distance changed? > > 10 is the local distance. So 30 should be 3x the latency that a local > access takes. > Does this patch then imply that we should do zone_reclaim only for 3x nodes and not 2x nodes as we did earlier. > > I suspect the side effect is the zone_reclaim_mode is not set to 1 on > > bootup for the 2-4 socket machines you mention, which results in > > better VM behaviour? > > Right. > -- Three Cheers, Balbir -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org