From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264944AbTK3RGZ (ORCPT ); Sun, 30 Nov 2003 12:06:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264947AbTK3RGZ (ORCPT ); Sun, 30 Nov 2003 12:06:25 -0500 Received: from parcelfarce.linux.theplanet.co.uk ([195.92.249.252]:5554 "EHLO www.linux.org.uk") by vger.kernel.org with ESMTP id S264944AbTK3RGX (ORCPT ); Sun, 30 Nov 2003 12:06:23 -0500 Message-ID: <3FCA2380.1050902@pobox.com> Date: Sun, 30 Nov 2003 12:06:08 -0500 From: Jeff Garzik User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030703 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Bartlomiej Zolnierkiewicz CC: Jens Axboe , "Prakash K. Cheemplavam" , marcush@onlinehome.de, linux-kernel@vger.kernel.org, eric_mudama@Maxtor.com Subject: Re: Silicon Image 3112A SATA trouble References: <3FC36057.40108@gmx.de> <3FCA1DD3.70004@pobox.com> <20031130165146.GY10679@suse.de> <200311301758.53885.bzolnier@elka.pw.edu.pl> In-Reply-To: <200311301758.53885.bzolnier@elka.pw.edu.pl> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Bartlomiej Zolnierkiewicz wrote: > On Sunday 30 of November 2003 17:51, Jens Axboe wrote: >>>Tangent: My non-pessimistic fix will involve submitting a single sector >>>DMA r/w taskfile manually, then proceeding with the remaining sectors in >>>another r/w taskfile. This doubles the interrupts on the affected >>>chipset/drive combos, but still allows large requests. I'm not terribly >> >>Or split the request 50/50. > > > We can't - hardware will lock up. Well, the constraint we must satisfy is sector_count % 15 != 1 (i.e. "== 1" causes the lockup) Beyond that, any request ratio should be ok AFAIK... Jeff