From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265504AbUBAXKL (ORCPT ); Sun, 1 Feb 2004 18:10:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265505AbUBAXKL (ORCPT ); Sun, 1 Feb 2004 18:10:11 -0500 Received: from fw.osdl.org ([65.172.181.6]:45211 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id S265504AbUBAXKG (ORCPT ); Sun, 1 Feb 2004 18:10:06 -0500 Date: Sun, 1 Feb 2004 15:11:11 -0800 From: Andrew Morton To: Philip Martin Cc: linux-kernel@vger.kernel.org Subject: Re: 2.6.1 slower than 2.4, smp/scsi/sw-raid/reiserfs Message-Id: <20040201151111.4a6b64c3.akpm@osdl.org> In-Reply-To: <87oesieb75.fsf@codematters.co.uk> References: <87oesieb75.fsf@codematters.co.uk> X-Mailer: Sylpheed version 0.9.4 (GTK+ 1.2.10; i686-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 X-Mailing-List: linux-kernel@vger.kernel.org Philip Martin wrote: > > The machine is a dual P3 450MHz, 512MB, aic7xxx, 2 disk RAID-0 and > ReiserFS. It's a few years old and has always run Linux, most > recently 2.4.24. I decided to try 2.6.1 and the performance is > disappointing. 2.6 has a few performance problems under heavy pageout at present. Nick Piggin has some patches which largely fix it up. > My test is a software build of about 200 source files (written in C) > that I usually build using "nice make -j4". Tried -j3? > Timing the build on > 2.4.24 I typically get something like > > 242.27user 81.06system 2:44.18elapsed 196%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (1742270major+1942279minor)pagefaults 0swaps > > and on 2.6.1 I get > > 244.08user 116.33system 3:27.40elapsed 173%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (0major+3763670minor)pagefaults 0swaps hm, the major fault accounting is wrong.