From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 24 Sep 2001 11:05:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 24 Sep 2001 11:05:01 -0400 Received: from pD957B3C7.dip.t-dialin.net ([217.87.179.199]:1030 "EHLO enigma.deepspace.net") by vger.kernel.org with ESMTP id ; Mon, 24 Sep 2001 11:04:50 -0400 Message-Id: <200109241505.RAA12224@enigma.deepspace.net> Content-Type: text/plain; charset=US-ASCII From: Wolly To: Chris Mason , linux-kernel@vger.kernel.org Subject: Re: Huge disk performance degradation STILL IN 2.4.10 Date: Mon, 24 Sep 2001 17:05:13 +0200 X-Mailer: KMail [version 1.2.1] In-Reply-To: <200109211723.TAA00638@enigma.deepspace.net> <200109232319.BAA02449@enigma.deepspace.net> <2100580000.1001289300@tiny> In-Reply-To: <2100580000.1001289300@tiny> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Monday 24 September 2001 01:55, Chris Mason wrote: > On Monday, September 24, 2001 01:19:18 AM +0200 Wolly > wrote: > > Hi kernel hackers, > > > > As soon as 2.4.10 was out, I got the patch and tested it again. > > The problem is still there and did not get better at all. > > Could you please mount the FS with -o notail and try again? I think your > test is hitting a worst case in the 2.4.x reiserfs tail code. > Okay, I plugged some old hd into my computer and formatted one half with ext2, the other half with reiserfs. It seems to be definitely a reiserfs issue because I cannot trigger the performance loss (permament hd head positioning) with ext2. However, passing -o notail when mounting does not help. (-o notail is accepted and `bash# mount' displays `/dev/hdxy on /mnt type reiserfs (rw,notail)') Could you reproduce this? Did you even try? And why does this not show up on kernels <=2.4.6 and shows up with linux>=2.4.9 (2.4.7, 2.4.8: unknown)? -Wolly