From owner-freebsd-current@FreeBSD.ORG Sun Jun 25 09:23:41 2006 Return-Path: X-Original-To: freebsd-current@freebsd.org Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 40CEB16A401 for ; Sun, 25 Jun 2006 09:23:41 +0000 (UTC) (envelope-from ticso@cicely12.cicely.de) Received: from raven.bwct.de (raven.bwct.de [85.159.14.73]) by mx1.FreeBSD.org (Postfix) with ESMTP id 99CBF43D66 for ; Sun, 25 Jun 2006 09:23:38 +0000 (GMT) (envelope-from ticso@cicely12.cicely.de) Received: from cicely5.cicely.de ([10.1.1.7]) by raven.bwct.de (8.13.4/8.13.4) with ESMTP id k5P9NZoA000397; Sun, 25 Jun 2006 11:23:35 +0200 (CEST) (envelope-from ticso@cicely12.cicely.de) Received: from cicely12.cicely.de (cicely12.cicely.de [10.1.1.14]) by cicely5.cicely.de (8.13.4/8.13.4) with ESMTP id k5P9NVfm065956 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sun, 25 Jun 2006 11:23:31 +0200 (CEST) (envelope-from ticso@cicely12.cicely.de) Received: from cicely12.cicely.de (localhost [127.0.0.1]) by cicely12.cicely.de (8.13.4/8.13.3) with ESMTP id k5P9NVjB033530; Sun, 25 Jun 2006 11:23:31 +0200 (CEST) (envelope-from ticso@cicely12.cicely.de) Received: (from ticso@localhost) by cicely12.cicely.de (8.13.4/8.13.3/Submit) id k5P9NUYu033529; Sun, 25 Jun 2006 11:23:30 +0200 (CEST) (envelope-from ticso) Date: Sun, 25 Jun 2006 11:23:30 +0200 From: Bernd Walter To: Philippe CASIDY Message-ID: <20060625092329.GI27372@cicely12.cicely.de> References: <20060620034229.GA48515@dragon.NUXI.org> <449E5C2A.5000601@casidy.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <449E5C2A.5000601@casidy.com> X-Operating-System: FreeBSD cicely12.cicely.de 5.4-STABLE alpha User-Agent: Mutt/1.5.9i X-Spam-Status: No, score=-4.4 required=5.0 autolearn=ham version=3.1.1 X-Spam-Checker-Version: SpamAssassin 3.1.1 (2006-03-10) on cicely12.cicely.de Cc: freebsd-current@freebsd.org Subject: Re: Often experiencing nfs server foo:/bar: not responding X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: ticso@cicely.de List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 25 Jun 2006 09:23:41 -0000 On Sun, Jun 25, 2006 at 09:49:30AM +0000, Philippe CASIDY wrote: > David O'Brien wrote: > >I am getting these errors all the time now (now being -CURRENT newer than > >Dec'05-Jan'06 time frame). Are there some known issues in UDP or NFS > >serving since then? This is on a virtually zero loaded 100Mbit network. > >Both the NFS server and client are FreeBSD-CURRENT systems. > > > >I can trivially trigger this on all my FreeBSD-CURRENT NFS clients, > >simply by exiting Vim. Did something change sometime in 2006 that would > >affect the default NFS mounts? > > > > I experience this problem from now and then too. > The problem was gone when I upgraded my server to from 5.1 to > 5.5-PRELEASE. Before that, I added an entry in the server's crontab to > launch a script that does : > > #!/bin/sh > /sbin/ifconfig re0 mtu 1490 > /bin/sleep 15 > /sbin/ifconfig re0 mtu 1500 > > I had then bad network performances but no more NFS lockdown. This is likely a different story - re chips have broken hardware checksum offloading. All retransmission get the same defect until you force a different pattern with the MTU change. The feature was turned off by default later. -- B.Walter http://www.bwct.de http://www.fizon.de bernd@bwct.de info@bwct.de support@fizon.de