From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762676AbYCFISk (ORCPT ); Thu, 6 Mar 2008 03:18:40 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752450AbYCFIS1 (ORCPT ); Thu, 6 Mar 2008 03:18:27 -0500 Received: from brick.kernel.dk ([87.55.233.238]:18012 "EHLO kernel.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752325AbYCFIS0 (ORCPT ); Thu, 6 Mar 2008 03:18:26 -0500 Date: Thu, 6 Mar 2008 09:18:23 +0100 From: Jens Axboe To: Linux Kernel Mailing List Cc: jeff@garzik.org Subject: Re: ahci: work around ATI SB600 h/w quirk Message-ID: <20080306081822.GO6704@kernel.dk> References: <200803060259.m262x3tp008780@hera.kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200803060259.m262x3tp008780@hera.kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Mar 06 2008, Linux Kernel Mailing List wrote: > Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=a878539ef994787c447a98c2e3ba0fe3dad984ec > Commit: a878539ef994787c447a98c2e3ba0fe3dad984ec > Parent: 6ddd68615ae9b21096545d7d6ab0f04113ae8b42 > Author: Jeff Garzik > AuthorDate: Thu Feb 28 15:43:48 2008 -0500 > Committer: Jeff Garzik > CommitDate: Wed Mar 5 07:53:06 2008 -0500 > > ahci: work around ATI SB600 h/w quirk > > This addresses the recent ATI SB600 errata, where the hardware does > not like 256-length PRD entries during FPDMA (aka NCQ). > > It hurts performance on SB600, but it is more important to get a > correct patch eliminating the data corruption/lockups, and then later > on tune for performance. > > We simply limit each command to a maximum of 255 sectors, on SB600. Why not limit it to 255 segments, if that's the real issue? -- Jens Axboe