From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751370AbWCaOfE (ORCPT ); Fri, 31 Mar 2006 09:35:04 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750754AbWCaOfD (ORCPT ); Fri, 31 Mar 2006 09:35:03 -0500 Received: from unthought.net ([212.97.129.88]:1804 "EHLO unthought.net") by vger.kernel.org with ESMTP id S1751370AbWCaOfB (ORCPT ); Fri, 31 Mar 2006 09:35:01 -0500 Date: Fri, 31 Mar 2006 16:35:00 +0200 From: Jakob Oestergaard To: Trond Myklebust Cc: linux-kernel@vger.kernel.org Subject: Re: NFS client (10x) performance regression 2.6.14.7 -> 2.6.15 Message-ID: <20060331143500.GK9811@unthought.net> Mail-Followup-To: Jakob Oestergaard , Trond Myklebust , linux-kernel@vger.kernel.org References: <20060331094850.GF9811@unthought.net> <1143807770.8096.4.camel@lade.trondhjem.org> <20060331124518.GH9811@unthought.net> <1143810392.8096.11.camel@lade.trondhjem.org> <20060331132131.GI9811@unthought.net> <1143812658.8096.18.camel@lade.trondhjem.org> <20060331140816.GJ9811@unthought.net> <1143814889.8096.22.camel@lade.trondhjem.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1143814889.8096.22.camel@lade.trondhjem.org> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Mar 31, 2006 at 09:21:29AM -0500, Trond Myklebust wrote: ... > > Hmm... Nothing obvious. Ok. I'm wondering... Can anyone else reproduce this problem? Just to explain quickly: Running nfsbench (on the NFS client) once with LEADING_EMPTY_SPACE set to 0 and then once with the option set to 1. If there's a big change in wall-clock execution time, this indicates that the problem exists. I'd be really interested in knowing whether I'm the only one who sees this problem. > Try catting /proc/self/mountstats and see if the entry for your NFS > mount shows anything interesting. mountstats doesn't exist on 2.6.15.7 so I can't really compare... I wonder if any of the following is 'interesting' :) device sparrow:/exported/joe mounted on /u/joe with fstype nfs statvers=1.0 opts: rw,vers=3,rsize=32768,wsize=32768,acregmin=3,acregmax=60,acdirmin=30, acdirmax=60,hard,intr,proto=udp,timeo=7,retrans=3 age: 274 caps: caps=0x1,wtmult=4096,dtsize=4096,bsize=0,namelen=255 sec: flavor=1 events: 175 77 3 3 14 15 108 4 0 7 0 4 0 1 2 0 0 14 0 1 4 0 0 0 0 bytes: 194733 11746 0 0 37748 15340 13 0 RPC iostats version: 1.0 p/v: 100003/3 (nfs) xprt: udp 1023 0 74 74 0 74 0 per-op statistics ... then follows the nfsstat numbers as far as I can see ... Does the above tell you anything? -- / jakob