From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id q63NBTLo139941 for ; Tue, 3 Jul 2012 18:11:30 -0500 Received: from ipmail05.adl6.internode.on.net (ipmail05.adl6.internode.on.net [150.101.137.143]) by cuda.sgi.com with ESMTP id GxF6B04gUT4PaoP0 for ; Tue, 03 Jul 2012 16:11:27 -0700 (PDT) Date: Wed, 4 Jul 2012 09:11:22 +1000 From: Dave Chinner Subject: Re: Backporting the concurrent direct IO write fix to 3.4 Message-ID: <20120703231122.GB19223@dastard> References: <4FF2F41F.5000504@gmail.com> <20120703160949.GD855@infradead.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20120703160949.GD855@infradead.org> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: Christoph Hellwig Cc: xfs@oss.sgi.com, Kerin Millar On Tue, Jul 03, 2012 at 12:09:49PM -0400, Christoph Hellwig wrote: > On Tue, Jul 03, 2012 at 02:31:11PM +0100, Kerin Millar wrote: > > Hi, > > > > I recently became aware of commit 507630b2 (use shared ilock mode for > > direct IO writes by default). I understand that this fixes a regression > > which can have a notable impact upon MySQL performance. This is of > > considerable interest to myself because my MySQL servers have to contend > > with a really tough workload. > > > > The patch applies cleanly to 3.4 stable but is it actually safe to use > > it there? Or does it depend on other changes to XFS, such that I'd be > > better off holding out for 3.5? Any advice would be greatly appreciated. > > You want the whole series starting at b4d05e3019692fc5a8c573fbce60de2d48c5b7a1 > without the earlier patches there are potential problems when using > quotas. > > On the one hand I'd love to see these patches go into 3.4-stable as it's > going to be a long term release, Is it? So we will have long term support kernels for 3.0.x, 3.2.x and now 3.4.x? 3.0.x is the long term stable kernel I'm targetting for backports and there's no way I can really handle more than that... > on the other hand they are fairly > invasive. If you can give a headsup after passing xfstests and heavy > mysql testing including benchmarks it might make sense to consider them. I've got to port them back to 3.0, so I'm not sure it makes sense to port them to 3.4. Cheers, Dave. -- Dave Chinner david@fromorbit.com _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs