Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757427Ab1EXUHU (ORCPT ); Tue, 24 May 2011 16:07:20 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:38669 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753094Ab1EXUHS (ORCPT ); Tue, 24 May 2011 16:07:18 -0400 Date: Tue, 24 May 2011 13:07:00 -0700 From: Andrew Morton To: Dave Hansen Cc: KOSAKI Motohiro , LKML , linux-mm , Christoph Lameter , David Rientjes , KAMEZAWA Hiroyuki , Chris McDermott Subject: Re: [PATCH resend^2] mm: increase RECLAIM_DISTANCE to 30 Message-Id: <20110524130700.079b09e8.akpm@linux-foundation.org> In-Reply-To: <1302575241.7286.17853.camel@nimitz> References: <20110411172004.0361.A69D9226@jp.fujitsu.com> <1302557371.7286.16607.camel@nimitz> <20110412100129.43F1.A69D9226@jp.fujitsu.com> <1302575241.7286.17853.camel@nimitz> X-Mailer: Sylpheed 3.0.2 (GTK+ 2.20.1; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2155 Lines: 48 On Mon, 11 Apr 2011 19:27:21 -0700 Dave Hansen wrote: > On Tue, 2011-04-12 at 10:01 +0900, KOSAKI Motohiro wrote: > > > 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. > > > > Which hardware? > > I'd have to go digging for the model numbers. I just remember having > discussions with folks about it a couple of years ago. My memory isn't > what it used to be. :) > > > The reason why now we decided to change default is the original bug reporter was using > > mere commodity whitebox hardware and very common workload. > > If it is enough commotidy, we have to concern it. but if it is special, we don't care it. > > Hardware vendor should fix a firmware. > > Yeah, it's certainly a "simple" fix. The distance tables can certainly > be adjusted easily, and worked around pretty trivially with boot > options. If we decide to change the generic case, let's also make sure > that we put something else in place simultaneously that is nice for the > folks that don't want it changed. Maybe something DMI-based that digs > for model numbers? > > I'll go try and dig for some more specifics on the hardware so we at > least have something to test on. > How's that digging coming along? I'm pretty wobbly about this patch. Perhaps we should set RECLAIM_DISTANCE to pi/2 or something, to force people to correctly set the dang thing in initscripts. -- 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/