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 81BB3900086 for ; Tue, 12 Apr 2011 20:27:08 -0400 (EDT) Message-ID: <90769A9DD8A14AE8A5A08BAC24B1245F@jem> From: "Rob Mueller" References: <20110411172004.0361.A69D9226@jp.fujitsu.com> Subject: Re: [PATCH resend^2] mm: increase RECLAIM_DISTANCE to 30 Date: Wed, 13 Apr 2011 10:26:50 +1000 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: David Rientjes , KOSAKI Motohiro Cc: LKML , linux-mm , Andrew Morton , Christoph Lameter , KAMEZAWA Hiroyuki >> Recently, Robert Mueller reported zone_reclaim_mode doesn't work >> properly on his new NUMA server (Dual Xeon E5520 + Intel S5520UR MB). >> He is using Cyrus IMAPd and it's built on a very traditional >> single-process model. >> > > Let's add Robert to the cc to see if this is still an issue, it hasn't > been re-reported in over six months. We definitely still set this in /etc/sysctl.conf on every imap server machine: vm.zone_reclaim_mode = 0 I believe it still defaults to 1 otherwise. What I haven't tested is if leaving it at 1 still causes problems. It definitely DID previously cause big problems (I think that was around 2.6.34 or so). http://blog.fastmail.fm/2010/09/15/default-zone_reclaim_mode-1-on-numa-kernel-is-bad-for-fileemailweb-servers/ I'll try changing it to 1 on a machine for 4 hours, see if it makes a noticeable difference and report back. Rob -- 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 internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org