From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266208AbUFPHZ5 (ORCPT ); Wed, 16 Jun 2004 03:25:57 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261984AbUFPHZ4 (ORCPT ); Wed, 16 Jun 2004 03:25:56 -0400 Received: from smtp-send.myrealbox.com ([192.108.102.143]:49959 "EHLO smtp-send.myrealbox.com") by vger.kernel.org with ESMTP id S266207AbUFPHZi (ORCPT ); Wed, 16 Jun 2004 03:25:38 -0400 Subject: Re: PROBLEM: Heavy iowait on 2.6 kernels From: Guy Van Sanden To: Clint Byrum Cc: linux-kernel@vger.kernel.org In-Reply-To: <1087366549.1190.6.camel@lancelot> References: <1086942905.10540.69.camel@cronos.home.vsb> <1087366549.1190.6.camel@lancelot> Content-Type: text/plain Message-Id: <1087369893.11205.36.camel@cronos.home.vsb> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 Date: Wed, 16 Jun 2004 09:25:31 +0200 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org My machine is heavily used for all kinds of file serving (mainly nfs), but also samba. Next to that, it is my home-server, so it runs apache2 (tuned to server only few clients), imap (cyrus), postfix, bugzilla (mysql) and distcc (used only a few times a week). It replaces a FreeBSD system (PII-333) running the same except distcc. Under The disk system is just a regular IDE disk (udma5) (60GB) and one external drive over USB2 (160 GB). The external drive is rather slow (20-30 MB/sec), so I disabled it during the tests. The weird thing is that I see this problem too when only running bonnie. A friend of mine tried that too under 2.6.6, his iowait went up to 0.15%, mine to 99%. On Wed, 2004-06-16 at 08:15, Clint Byrum wrote: > On Fri, 2004-06-11 at 01:35, Guy Van Sanden wrote: > > I recently discovered why my new Gentoo server slows to a crawl on a > > intermediate load on the 2.6 kernel series. The reason seems to be an > > unusual amount of iowait. > > This appears similar to the problem both myself and Phy Prahbab reported > about 2.6 and hitting the disks too often. > > I'm wondering, what kind of workload does your machine see, and what > sort of disk system is in it? > > > - > 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/ -- ______________________________________________________________________ Guy Van Sanden http://unixmafia.port5.com Registered Linux user #249404 - September 1997 ______________________________________________________________________