Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 7 Mar 2001 08:55:23 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 7 Mar 2001 08:55:13 -0500 Received: from zeus.kernel.org ([209.10.41.242]:47581 "EHLO zeus.kernel.org") by vger.kernel.org with ESMTP id ; Wed, 7 Mar 2001 08:54:56 -0500 Date: Wed, 7 Mar 2001 13:51:35 +0000 From: "Stephen C. Tweedie" To: Jens Axboe Cc: David Balazic , torvalds@transmeta.com, "linux-kernel@vger.kernel.org" , Stephen Tweedie Subject: Re: scsi vs ide performance on fsync's Message-ID: <20010307135135.B3715@redhat.com> In-Reply-To: <3AA53DC0.C6E2F308@uni-mb.si> <20010306213720.U2803@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <20010306213720.U2803@suse.de>; from axboe@suse.de on Tue, Mar 06, 2001 at 09:37:20PM +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi, On Tue, Mar 06, 2001 at 09:37:20PM +0100, Jens Axboe wrote: > > SCSI has ordered tag, which fit the model Alan described quite nicely. > I've been meaning to implement this for some time, it would be handy > for journalled fs to use such a barrier. Since ATA doesn't do queueing > (at least not in current Linux), a synchronize cache is probably the > only way to go there. Note that you also have to preserve the position of the barrier in the elevator queue, and you need to prevent LVM and soft raid from violating the barrier if different commands end up being sent to different disks. --Stephen - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/