From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263429AbUEPKCR (ORCPT ); Sun, 16 May 2004 06:02:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263457AbUEPKCR (ORCPT ); Sun, 16 May 2004 06:02:17 -0400 Received: from fw.osdl.org ([65.172.181.6]:29372 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id S263448AbUEPKCP (ORCPT ); Sun, 16 May 2004 06:02:15 -0400 Date: Sun, 16 May 2004 03:01:36 -0700 From: Andrew Morton To: Steven Cole Cc: torvalds@osdl.org, adi@bitmover.com, scole@lanl.gov, support@bitmover.com, linux-kernel@vger.kernel.org Subject: Re: 1352 NUL bytes at the end of a page? (was Re: Assertion `s && s->tree' failed: The saga continues.) Message-Id: <20040516030136.2081898a.akpm@osdl.org> In-Reply-To: <200405152231.15099.elenstev@mesatop.com> References: <200405132232.01484.elenstev@mesatop.com> <200405152231.15099.elenstev@mesatop.com> X-Mailer: Sylpheed version 0.9.7 (GTK+ 1.2.10; i386-redhat-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 Steven Cole wrote: > > The script only reported one > iteration finished, while I got it to do 36 iterations over several hours earlier > today (with a 2.6.3-4mdk vendor kernel), so I'm going to add some timing > tests to the script to see if things are really slowing down with current kernels, > or if it's just my worried imaginings. I did a bit of testing on a 256MB laptop with a fairly slow disk, ext3. Three iterations of the test took: 2.6.6: 1055.53s user 327.14s system 32% cpu 1:10:06.71 total 2.4.27-pre2: 1042.03s user 307.21s system 32% cpu 1:09:46.00 total 2.6.3: 1053.23s user 326.16s system 27% cpu 1:22:07.24 total So there's nothing particularly wild there. It's possible I guess that the 2.6 VM is very sucky but something else made up for it - possibly the anticipatory scheduler but more likely the Orlov allocator. You're using reiserfs, yes? Are you sure the IDE disks are in DMA mode?