Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754822AbXKVXJs (ORCPT ); Thu, 22 Nov 2007 18:09:48 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753218AbXKVXJk (ORCPT ); Thu, 22 Nov 2007 18:09:40 -0500 Received: from relay1.sgi.com ([192.48.171.29]:59924 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753243AbXKVXJk (ORCPT ); Thu, 22 Nov 2007 18:09:40 -0500 Date: Fri, 23 Nov 2007 10:09:22 +1100 From: David Chinner To: David Chinner Cc: Matt Mackall , Andi Kleen , xfs-oss , lkml Subject: Re: [PATCH 2/9]: Reduce Log I/O latency Message-ID: <20071122230922.GZ114266761@sgi.com> References: <20071122003339.GH114266761__34694.2978365861$1195691722$gmane$org@sgi.com> <20071122011214.GR114266761@sgi.com> <20071122025726.GG17536@waste.org> <20071122034106.GV114266761@sgi.com> <20071122072549.GQ19691@waste.org> <20071122103159.GW114266761@sgi.com> <20071122181029.GR19691@waste.org> <20071122222909.GY114266761@sgi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20071122222909.GY114266761@sgi.com> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1019 Lines: 28 On Fri, Nov 23, 2007 at 09:29:09AM +1100, David Chinner wrote: > On Thu, Nov 22, 2007 at 12:10:29PM -0600, Matt Mackall wrote: > > If I've got XFS on filesystems A and B on the same spindle (or volume > > group?) and my real RT I/O takes place only on B, then I want log > > flushing to happen in RT on B. But -never on A-. If I can do this with > > a tunable, I'm perfectly happy. > > No, not another mount option. I'm just going to drop this one for > now... Actually, I might change it to use the highest non-rt priority, which would solve the latency issues in the normal cases and still leave the RT rope dangling for those that want to use it. Is that an acceptible compromise, Matt? Cheers, Dave. -- Dave Chinner Principal Engineer SGI Australian Software Group - 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/