Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263206AbTEMG3Q (ORCPT ); Tue, 13 May 2003 02:29:16 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263208AbTEMG3P (ORCPT ); Tue, 13 May 2003 02:29:15 -0400 Received: from ns.virtualhost.dk ([195.184.98.160]:19921 "EHLO virtualhost.dk") by vger.kernel.org with ESMTP id S263206AbTEMG3K (ORCPT ); Tue, 13 May 2003 02:29:10 -0400 Date: Tue, 13 May 2003 08:41:42 +0200 From: Jens Axboe To: Christer Weinigel 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 Message-ID: <20030513064142.GM17033@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: Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 833 Lines: 23 On Tue, May 13 2003, Christer Weinigel wrote: > 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. And for journalled file systems, for instance. But yes generally you are right. -- Jens Axboe - 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/