From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262150AbVAOC1K (ORCPT ); Fri, 14 Jan 2005 21:27:10 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262153AbVAOC1K (ORCPT ); Fri, 14 Jan 2005 21:27:10 -0500 Received: from gockel.physik3.uni-rostock.de ([139.30.44.16]:40378 "EHLO gockel.physik3.uni-rostock.de") by vger.kernel.org with ESMTP id S262150AbVAOC1H (ORCPT ); Fri, 14 Jan 2005 21:27:07 -0500 Date: Sat, 15 Jan 2005 03:26:56 +0100 (CET) From: Tim Schmielau To: "Barry K. Nathan" cc: Andrew Morton , lkml Subject: Re: swapspace layout improvements advocacy In-Reply-To: <20050114225213.GA4841@ip68-4-98-123.oc.oc.cox.net> Message-ID: References: <20050112123524.GA12843@lnx-holt.americas.sgi.com> <20050112105315.2ac21173.akpm@osdl.org> <20050114225213.GA4841@ip68-4-98-123.oc.oc.cox.net> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 14 Jan 2005, Barry K. Nathan wrote: > I haven't tried the patch in question (unless it's in any Fedora > kernels), but I've noticed that the single biggest step to improve > swapping performance in 2.6 is to use the CFQ scheduler, not the AS > scheduler. (That's also why Red Hat/Fedora kernels use CFQ as the > default scheduler.) Yes, I also use CFQ. Didn't dare to try with the anticipatory scheduler. Since Andrew was so sceptical, I tested a bit more, and it's not as easily reproducible as I wrote. There don't seem to be any problems on a freshly booted system. It only happens after using the system for some time. But I think that's only natural as the virtal->physical mapping needs to be disturbed before seeing any problems. Tim