From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262355AbTL3UrD (ORCPT ); Tue, 30 Dec 2003 15:47:03 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262425AbTL3UrD (ORCPT ); Tue, 30 Dec 2003 15:47:03 -0500 Received: from 80-169-17-66.mesanetworks.net ([66.17.169.80]:10206 "EHLO mail.bounceswoosh.org") by vger.kernel.org with ESMTP id S262355AbTL3UrB (ORCPT ); Tue, 30 Dec 2003 15:47:01 -0500 Date: Tue, 30 Dec 2003 13:48:20 -0700 From: "Eric D. Mudama" To: linux-kernel@vger.kernel.org Subject: Re: Is it safe to ignore UDMA BadCRC errors? Message-ID: <20031230204820.GA7663@bounceswoosh.org> Mail-Followup-To: linux-kernel@vger.kernel.org References: <16368.20794.147453.255239@jik.kamens.brookline.ma.us> <20031229195235.GC26821@bounceswoosh.org> <16369.25514.425834.153361@jik.kamens.brookline.ma.us> <20031230200643.GC6992@bounceswoosh.org> <16369.56307.995425.595117@jik.kamens.brookline.ma.us> <20031230202540.GE6992@bounceswoosh.org> <16369.57428.470813.237725@jik.kamens.brookline.ma.us> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <16369.57428.470813.237725@jik.kamens.brookline.ma.us> User-Agent: Mutt/1.5.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Dec 30 at 15:30, Jonathan Kamens wrote: >Eric D. Mudama writes: > > UDMA modes include a checksum on every transfer, for both reads and > > writes. > >This contradicts what I was told previously by another subscriber to >this list. > >If it is true, then it would appear that the answer to my question "Is >it save to ignore UDMA BadCRC errors?" is "Yes." If all transfers are >checksummed, and if all transfers with bad checksums will be retried >by the kernel, then occasional checksum errors are harmless because >they will be retried. Do you agree? No, I don't. Your system may always detect the errors and function happily (as designed) but to me the $30 for the security of knowing you have 100% functioning hardware is well worth it. --eric -- Eric D. Mudama edmudama@mail.bounceswoosh.org