From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail203.messagelabs.com (mail203.messagelabs.com [216.82.254.243]) by kanga.kvack.org (Postfix) with ESMTP id E00DB6B0071 for ; Tue, 23 Nov 2010 05:04:21 -0500 (EST) Date: Tue, 23 Nov 2010 10:04:03 +0000 From: Mel Gorman Subject: Re: Free memory never fully used, swapping Message-ID: <20101123100402.GH19571@csn.ul.ie> References: <20101115195246.GB17387@hostway.ca> <20101122154419.ee0e09d2.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: <20101122154419.ee0e09d2.akpm@linux-foundation.org> Sender: owner-linux-mm@kvack.org To: Andrew Morton Cc: Simon Kirby , linux-kernel , linux-mm@kvack.org List-ID: On Mon, Nov 22, 2010 at 03:44:19PM -0800, Andrew Morton wrote: > On Mon, 15 Nov 2010 11:52:46 -0800 > Simon Kirby wrote: > > > I noticed that CONFIG_NUMA seems to enable some more complicated > > reclaiming bits and figured it might help since most stock kernels seem > > to ship with it now. This seems to have helped, but it may just be > > wishful thinking. We still see this happening, though maybe to a lesser > > degree. (The following observations are with CONFIG_NUMA enabled.) > > Hi, As this is a NUMA machine, what is the value of /proc/sys/vm/zone_reclaim_mode ? When enabled, this reclaims memory local to the node in preference to using remote nodes. For certain workloads this performs better but for users that expect all of memory to be used, it has surprising results. If set to 1, try testing with it set to 0 and see if it makes a difference. Thanks -- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab -- 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/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: email@kvack.org