From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262525AbTELTcO (ORCPT ); Mon, 12 May 2003 15:32:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262531AbTELTcO (ORCPT ); Mon, 12 May 2003 15:32:14 -0400 Received: from ns.virtualhost.dk ([195.184.98.160]:25255 "EHLO virtualhost.dk") by vger.kernel.org with ESMTP id S262525AbTELTbu (ORCPT ); Mon, 12 May 2003 15:31:50 -0400 Date: Mon, 12 May 2003 21:44:26 +0200 From: Jens Axboe To: Jeff Garzik Cc: "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 Message-ID: <20030512194426.GH17033@suse.de> References: <785F348679A4D5119A0C009027DE33C102E0D31D@mcoexc04.mlm.maxtor.com> <20030512193509.GB10089@gtf.org> <20030512194245.GG17033@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20030512194245.GG17033@suse.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, May 12 2003, Jens Axboe wrote: > > Coming from an OS perspective, I think we really want to be able to > > queue up a bunch of scatterlists, like the new AHCI spec does. > > I have to agree with Eric that the largest win is potentially not > getting hit by the rotational latency all the time. I don't think you'll > get much extra from actually having more than one active from the dma > POV. Actually, thinking a bit about it, if you could have more than one active command then the release interrupt gets more interesting. I've been brain damaged from working on the current stuff. It's one thing what the spec tells you, it's another what really works in reality :/ -- Jens Axboe