From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262603AbTLBSIb (ORCPT ); Tue, 2 Dec 2003 13:08:31 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262746AbTLBSIF (ORCPT ); Tue, 2 Dec 2003 13:08:05 -0500 Received: from havoc.gtf.org ([63.247.75.124]:38291 "EHLO havoc.gtf.org") by vger.kernel.org with ESMTP id S262603AbTLBSE7 (ORCPT ); Tue, 2 Dec 2003 13:04:59 -0500 Date: Tue, 2 Dec 2003 13:04:58 -0500 From: Jeff Garzik To: Greg Stark , Erik Steffl , linux-kernel@vger.kernel.org Subject: Re: libata in 2.4.24? Message-ID: <20031202180458.GC1990@gtf.org> References: <3FCB8312.3050703@rackable.com> <87fzg4ckej.fsf@stark.dyndns.tv> <3FCBB15F.7050505@rackable.com> <3FCBB9F1.2080300@bigfoot.com> <87n0abbx2k.fsf@stark.dyndns.tv> <20031202055336.GO1566@mis-mike-wstn.matchmail.com> <20031202055852.GP1566@mis-mike-wstn.matchmail.com> <87zneb9o5q.fsf@stark.dyndns.tv> <20031202174048.GQ1566@mis-mike-wstn.matchmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20031202174048.GQ1566@mis-mike-wstn.matchmail.com> User-Agent: Mutt/1.3.28i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Dec 02, 2003 at 09:40:48AM -0800, Mike Fedyk wrote: > There are PATA drives that do TCQ too, but you have to look for that feature > specifically. IDE TCQ is in 2.6, but is still experemental. I think Jens > Axboe was the one working on it IIRC. He would have more details. Let us distinguish three types of TCQ: 1) PATA drive-side TCQ (now called "legacy TCQ") 2) Controller-side TCQ 3) SATA drive/controller-side TCQ ("first party DMA") libata will never support #1, which is what 2.6 supports in experimental option. libata will support #2 very soon, and will support #3 when hardware is available. > > Do the new SATA drives and controllers provide a solution to this? > > It's not SATA specific, and I'm not sure if any ide controller can support > TCQ or if only a specific list are compatible. The TCQ you are thinking of has been deprecated by the people who make IDE drives ;-) Jeff