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 o8BJc6lE221127 for ; Sat, 11 Sep 2010 14:38:06 -0500 Received: from greer.hardwarefreak.com (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 2BF144E50CD for ; Sat, 11 Sep 2010 12:38:52 -0700 (PDT) Received: from greer.hardwarefreak.com (mo-65-41-216-221.sta.embarqhsd.net [65.41.216.221]) by cuda.sgi.com with ESMTP id kzlGXj0HFmzY7nQX for ; Sat, 11 Sep 2010 12:38:52 -0700 (PDT) Received: from [192.168.100.53] (gffx.hardwarefreak.com [192.168.100.53]) by greer.hardwarefreak.com (Postfix) with ESMTP id 0A1956C361 for ; Sat, 11 Sep 2010 14:38:48 -0500 (CDT) Message-ID: <4C8BDAC8.8010203@hardwarefreak.com> Date: Sat, 11 Sep 2010 14:38:48 -0500 From: Stan Hoeppner MIME-Version: 1.0 Subject: Re: XFS defragmentation issue References: <4C8A4395.5070702@kickstone.com> <4C8B27E4.2050102@kickstone.com> <20100911082330.GG705@dastard> In-Reply-To: <20100911082330.GG705@dastard> 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: xfs@oss.sgi.com Dave Chinner put forth on 9/11/2010 3:23 AM: > On Sat, Sep 11, 2010 at 07:55:32AM +0100, John Lister wrote: >> Stan Hoeppner wrote on 9/10/2010 14:00 >>>> On 10/09/2010 15:41, John Lister wrote: >>> Try unmounting and remounting the filesystem, and see if the various >>> tools all report the same thing afterwards. This solved the exact same >>> problem for me very recently, though I'm on kernel 2.6.34.1 and xfsprogs >>> 2.9.8. >> >> Cheers, that got rid of most of it, there is still a slight >> discrepency (50 extra fragments) which I can live with. > > xfs_db used buffered IO on the block device, which is not coherent > with the filesystem. If you are using it on an active filesystem, > then running "echo 1 > /proc/sys/vm/drop_caches" before you run > xfs_db should make it read from disk at least once.... That's good to know Dave. Thanks. I created a short-name script a while back with "echo 3 > /proc/sys/vm/drop_caches" merely so I could "clear the baffles" now and then. Looks like it now has multiple uses (if I can just remember to use it in this context). Out of curiosity, who here schedules automatic xfs_fsr runs, and with what frequency? Currently I just run it manually now and then when performance starts to seem sluggish. Thanks. -- Stan _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs