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, 18 Feb 2002 17:49:38 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 18 Feb 2002 17:49:18 -0500 Received: from parcelfarce.linux.theplanet.co.uk ([195.92.249.252]:30735 "EHLO www.linux.org.uk") by vger.kernel.org with ESMTP id ; Mon, 18 Feb 2002 17:49:08 -0500 Message-ID: <3C71848A.3DA9BC42@zip.com.au> Date: Mon, 18 Feb 2002 14:47:38 -0800 From: Andrew Morton X-Mailer: Mozilla 4.79 [en] (X11; U; Linux 2.4.18-rc1 i686) X-Accept-Language: en MIME-Version: 1.0 To: john CC: linux-kernel@vger.kernel.org Subject: Re: kupdated using all CPU In-Reply-To: <20020218134041.A2586@doom.sfo.covalent.net> <3C717C72.72A994D3@zip.com.au>, <3C717C72.72A994D3@zip.com.au>; from akpm@zip.com.au on Mon, Feb 18, 2002 at 02:13:06PM -0800 <20020218141920.D2586@doom.sfo.covalent.net> 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 john wrote: > > [Mon, Feb 18, 2002 at 02:13:06PM -0800] akpm@zip.com.au wrote: > + john wrote: > + > > + > hi, > + > ive searched all over and found many references to this problem, but > + > never found an actual solution. the problem is that during heavy > + > disk I/O, kupdated will periodically take up ALL the cpu. > + > + I've seen a couple of reports of this, nothing to indicate that it's > + a common problem? > + > + In the other reports, it was related to extremely low disk throughput. > + What does `hdparm -t /dev/hda' say? > > root@doom:~# hdparm -t /dev/hda > > /dev/hda: > Timing buffered disk reads: 64 MB in 25.60 seconds = 2.50 MB/sec ugh. OK, I'll see if I cen reproduce this - there's no reason why disk suckiness should cause high CPU load. But you need to pay some attention to your IDE settings in kernel config, and possibly tuning. -