Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265494AbTGCWwX (ORCPT ); Thu, 3 Jul 2003 18:52:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265489AbTGCWwG (ORCPT ); Thu, 3 Jul 2003 18:52:06 -0400 Received: from gutemberg-1-81-57-26-150.fbx.proxad.net ([81.57.26.150]:38091 "EHLO charlus.dyndns.org") by vger.kernel.org with ESMTP id S265485AbTGCWvq (ORCPT ); Thu, 3 Jul 2003 18:51:46 -0400 Message-ID: <3F04B6DA.2040300@ruault.com> Date: Fri, 04 Jul 2003 01:06:02 +0200 From: Charles-Edouard Ruault User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030624 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Mark Hahn CC: Francois Romieu , linux-kernel@vger.kernel.org Subject: Re: kernel 2.4.21 , large disk write => system crawls References: In-Reply-To: X-Enigmail-Version: 0.76.1.0 X-Enigmail-Supports: pgp-inline, pgp-mime 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 Content-Length: 1390 Lines: 54 Mark Hahn wrote: >>>>when i do a large disk write operation ( copy a big file for example ), >>>>the whole system becomes very busy ( system goes into 99% cpu >>>> >>>> > >it's not write-specific. you can see below that you're somehow >managing to trigger roughly two interrupts per *either* bi or bo. >for a normal IDE setup, you should see one interrupt per 16-64K >under average use. it's almost like your sys somehow thinks >that it can only transfer 1 sector per interrupt! > > hmmm interesting i had not noticed that ! > > >>everytime i experience a slowdown, there's a 'big' number in the io (bo) >>column. >> >> > >no, it's basically in=2*(bi+bo), as if your system somehow believes >it can only do a single sector per interrupt (PIO and -m1 perhaps?) >it should be more like 32K per interrupt. > > > >>Jun 27 22:52:31 charlus kernel: Found and enabled local APIC! >> >> > >have you tried without that? > >. > > > nope. I'll do that for sure. I've already had problems with APIC on other systems ... Thanks for the hint. I'll keep you posted if it works. -- Charles-Edouard Ruault PGP Key ID E10C24DC - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/