From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail191.messagelabs.com (mail191.messagelabs.com [216.82.242.19]) by kanga.kvack.org (Postfix) with ESMTP id 596968D003B for ; Mon, 11 Apr 2011 17:29:38 -0400 (EDT) Received: from d01dlp02.pok.ibm.com (d01dlp02.pok.ibm.com [9.56.224.85]) by e2.ny.us.ibm.com (8.14.4/8.13.1) with ESMTP id p3BLASYY007096 for ; Mon, 11 Apr 2011 17:10:28 -0400 Received: from d01relay02.pok.ibm.com (d01relay02.pok.ibm.com [9.56.227.234]) by d01dlp02.pok.ibm.com (Postfix) with ESMTP id 0941F6E8039 for ; Mon, 11 Apr 2011 17:29:36 -0400 (EDT) Received: from d03av03.boulder.ibm.com (d03av03.boulder.ibm.com [9.17.195.169]) by d01relay02.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p3BLTZYU218688 for ; Mon, 11 Apr 2011 17:29:35 -0400 Received: from d03av03.boulder.ibm.com (loopback [127.0.0.1]) by d03av03.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p3BLTYsd028091 for ; Mon, 11 Apr 2011 15:29:35 -0600 Subject: Re: [PATCH resend^2] mm: increase RECLAIM_DISTANCE to 30 From: Dave Hansen In-Reply-To: <20110411172004.0361.A69D9226@jp.fujitsu.com> References: <20110411172004.0361.A69D9226@jp.fujitsu.com> Content-Type: text/plain; charset="ISO-8859-1" Date: Mon, 11 Apr 2011 14:29:31 -0700 Message-ID: <1302557371.7286.16607.camel@nimitz> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: KOSAKI Motohiro Cc: LKML , linux-mm , Andrew Morton , Christoph Lameter , David Rientjes , KAMEZAWA Hiroyuki , Chris McDermott On Mon, 2011-04-11 at 17:19 +0900, KOSAKI Motohiro wrote: > This patch raise zone_reclaim_mode threshold to 30. 30 don't have > specific meaning. but 20 mean one-hop QPI/Hypertransport and such > relatively cheap 2-4 socket machine are often used for tradiotional > server as above. The intention is, their machine don't use > zone_reclaim_mode. I know specifically of pieces of x86 hardware that set the information in the BIOS to '21' *specifically* so they'll get the zone_reclaim_mode behavior which that implies. They've done performance testing and run very large and scary benchmarks to make sure that they _want_ this turned on. What this means for them is that they'll probably be de-optimized, at least on newer versions of the kernel. If you want to do this for particular systems, maybe _that_'s what we should do. Have a list of specific configurations that need the defaults overridden either because they're buggy, or they have an unusual hardware configuration not really reflected in the distance table. -- Dave -- 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