From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262813AbTELWUf (ORCPT ); Mon, 12 May 2003 18:20:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262820AbTELWUe (ORCPT ); Mon, 12 May 2003 18:20:34 -0400 Received: from zeus.kernel.org ([204.152.189.113]:27288 "EHLO zeus.kernel.org") by vger.kernel.org with ESMTP id S262813AbTELWUd (ORCPT ); Mon, 12 May 2003 18:20:33 -0400 To: Jens Axboe Cc: Jeff Garzik , "Mudama, Eric" , Oleg Drokin , Bartlomiej Zolnierkiewicz , Alan Cox , Oliver Neukum , lkhelp@rekl.yi.org, linux-kernel@vger.kernel.org Subject: Re: 2.5.69, IDE TCQ can't be enabled References: <785F348679A4D5119A0C009027DE33C102E0D31D@mcoexc04.mlm.maxtor.com> <20030512193509.GB10089@gtf.org> <20030512194245.GG17033@suse.de> From: Christer Weinigel Organization: Weinigel Ingenjorsbyra AB Date: 13 May 2003 00:36:48 +0200 In-Reply-To: <20030512194245.GG17033@suse.de> Message-ID: User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Jens Axboe writes: > I don't think the multiple pending _and_ active is that big a deal, and > besides _everybody_ uses write back caching on IDE which makes TCQ for > writes very uninteresting. Isn't it recommended to turn off write back caching when doing software raid? It will be hard to guarantee the consistency of the raid set otherwise. So I think that TCQ can be very interesting for some loads. /Christer -- "Just how much can I get away with and still go to heaven?" Freelance consultant specializing in device driver programming for Linux Christer Weinigel http://www.weinigel.se