From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265745AbUBCDDS (ORCPT ); Mon, 2 Feb 2004 22:03:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265764AbUBCDDS (ORCPT ); Mon, 2 Feb 2004 22:03:18 -0500 Received: from mail-06.iinet.net.au ([203.59.3.38]:738 "HELO mail.iinet.net.au") by vger.kernel.org with SMTP id S265745AbUBCDDR (ORCPT ); Mon, 2 Feb 2004 22:03:17 -0500 Message-ID: <401F0F5F.10306@cyberone.com.au> Date: Tue, 03 Feb 2004 14:02:55 +1100 From: Nick Piggin User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040122 Debian/1.6-1 X-Accept-Language: en MIME-Version: 1.0 To: Philip Martin CC: Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: 2.6.1 slower than 2.4, smp/scsi/sw-raid/reiserfs References: <87oesieb75.fsf@codematters.co.uk> <20040201151111.4a6b64c3.akpm@osdl.org> <401D9154.9060903@cyberone.com.au> <87llnm482q.fsf@codematters.co.uk> <401DDCD7.3010902@cyberone.com.au> <401E1131.6030608@cyberone.com.au> <87d68xcoqi.fsf@codematters.co.uk> <401EDEF2.6090802@cyberone.com.au> <20040202154959.283cf60b.akpm@osdl.org> <87isipvuvz.fsf@codematters.co.uk> In-Reply-To: <87isipvuvz.fsf@codematters.co.uk> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Philip Martin wrote: >Andrew Morton writes: > > >>Nick Piggin wrote: >> >>>Andrew, any other ideas? >>> >>There seems to be a lot more writeout happening. >> > >As far as I can see (and hear!) that's true. > > >>You could try setting /proc/sys/vm/dirty_ratio to 60 and >>/proc/sys/vm/dirty_background_ratio to 40. >> > >Not much different: > >2.6.1 (without elevator=deadline) > >dirty_ratio:60 dirty_background_ratio:40 > >245.58user 121.82system 3:31.79elapsed 173%CPU (0avgtext+0avgdata 0maxresident)k >0inputs+0outputs (0major+3771340minor)pagefaults 0swaps > >dirty_ratio:40 dirty_background_ratio:10 (the defaults) > >245.75user 121.33system 3:35.13elapsed 170%CPU (0avgtext+0avgdata 0maxresident)k >0inputs+0outputs (0major+3770826minor)pagefaults 0swaps > > > OK now thats strange - you're definitely compiling the same kernel with the same .config and compiler? 2.6 looks like its doing twice the amount of writeout that 2.4 is. Can you try the memory pressure program I sent you earlier?