From owner-freebsd-amd64@FreeBSD.ORG Sun Mar 28 02:14:34 2004 Return-Path: Delivered-To: freebsd-amd64@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8366516A4CE for ; Sun, 28 Mar 2004 02:14:34 -0800 (PST) Received: from dogfood.jrv.org (rrcs-sw-24-73-246-106.biz.rr.com [24.73.246.106]) by mx1.FreeBSD.org (Postfix) with ESMTP id 20B6943D41 for ; Sun, 28 Mar 2004 02:14:34 -0800 (PST) (envelope-from james@jrv.org) Received: from jrv.org (zippy.jrv.org [192.168.3.156]) (authenticated bits=0) by dogfood.jrv.org (8.12.11/8.12.10) with ESMTP id i2SAEX6q019951 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sun, 28 Mar 2004 04:14:33 -0600 (CST) (envelope-from james@jrv.org) Message-ID: <4066A588.4090705@jrv.org> Date: Sun, 28 Mar 2004 04:14:32 -0600 From: "James R. Van Artsalen" User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.6) Gecko/20040113 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Markus Schanovsky References: <6.0.0.22.2.20040328102132.028191f8@mail.schanovsky.at> In-Reply-To: <6.0.0.22.2.20040328102132.028191f8@mail.schanovsky.at> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit cc: freebsd-amd64@freebsd.org Subject: Re: WARNING: WRITE_DMA UDMA IRCR error X-BeenThere: freebsd-amd64@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Porting FreeBSD to the AMD64 platform List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 28 Mar 2004 10:14:34 -0000 Markus Schanovsky wrote: > Mar 26 09:02:25 free kernel: ad4: WARNING - WRITE_DMA UDMA ICRC error > (retrying request) LBA=118 > 169055 > > Now I solved the problem with sysctl hw.ata.ata_dma = 0 in my > /boot/loader.conf - there are no write errors further. > But what's the disadvantage of turning ata_dma off? > Speed? I have never seen that error. What disk controller are you using? Do you get that error with any other disk controller? Try different sATA cables? Boot into single-user mode and do a manual "fsck /usr" and make sure the disk is really OK after make buildworld. Turning off DMA will slow down disk transfers and increase CPU. Worse, it probably doesn't really fix the problem but rather hides it.