From owner-freebsd-current@FreeBSD.ORG Mon Sep 20 18:30:38 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 72E9C16A4CE for ; Mon, 20 Sep 2004 18:30:38 +0000 (GMT) Received: from mail.parodius.com (mail.parodius.com [64.62.145.229]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5399D43D3F for ; Mon, 20 Sep 2004 18:30:38 +0000 (GMT) (envelope-from jdc@pentarou.parodius.com) Received: from pentarou.parodius.com (jdc@localhost [127.0.0.1]) by mail.parodius.com (8.13.1/8.13.1) with ESMTP id i8KIUb15061957 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Mon, 20 Sep 2004 11:30:37 -0700 (PDT) (envelope-from jdc@pentarou.parodius.com) Received: (from jdc@localhost) by pentarou.parodius.com (8.13.1/8.13.1/Submit) id i8KIUbqC061956 for current@freebsd.org; Mon, 20 Sep 2004 11:30:37 -0700 (PDT) (envelope-from jdc) Date: Mon, 20 Sep 2004 11:30:37 -0700 From: Jeremy Chadwick To: current@freebsd.org Message-ID: <20040920183037.GA61741@parodius.com> Mail-Followup-To: current@freebsd.org References: <20040920100038.GA30307@clan.nothing-going-on.org> <20040920160019.GA3403@VARK.MIT.EDU> <20040920161628.GG30307@clan.nothing-going-on.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040920161628.GG30307@clan.nothing-going-on.org> User-Agent: Mutt/1.5.6i Subject: Re: Brief freezes with -current as of early last week X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 20 Sep 2004 18:30:38 -0000 PREEMPTION isn't a kernel option -- it's something you tweak in /usr/include/machine/param.h (or /usr/src/include/...), unless this procedure has changed recently... -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. | On Mon, Sep 20, 2004 at 05:16:30PM +0100, Nik Clayton wrote: > On Mon, Sep 20, 2004 at 12:00:19PM -0400, David Schultz wrote: > > This sounds like an I/O hang. I've been having similar problems > > related to WRITE_DMA and READ_DMA timeouts from the ata driver in > > the last week or so, as discussed last week on this list. Are you > > seeing these messages from the kernel? > > Like these? > > ad0: TIMEOUT - READ_DMA retrying (2 retries left) LBA=47240127 > ad0: WARNING - READ_DMA no interrupt but good status > ad1: TIMEOUT - READ_DMA retrying (2 retries left) LBA=165370263 > ad1: WARNING - READ_DMA no interrupt but good status > > ad0 is a 2 year old 40GB disk, ad1 is 1 week old 120GB disk. > > > Julian suggested disabling > > preemption, which I haven't tried yet, but other people report > > limited success. > > I'm not running a kernel with 'options PREEMPTION' compiled in... > > N > -- > FreeBSD: The Power to Serve http://www.freebsd.org/ (__) > FreeBSD Documentation Project http://www.freebsd.org/docproj/ \\\'',) > \/ \ ^ > --- 15B8 3FFC DDB4 34B0 AA5F 94B7 93A8 0764 2C37 E375 --- .\._/_)