From owner-freebsd-current@FreeBSD.ORG Tue Mar 25 19:59:40 2003 Return-Path: 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 3ED0337B401 for ; Tue, 25 Mar 2003 19:59:40 -0800 (PST) Received: from dan.emsphone.com (dan.emsphone.com [199.67.51.101]) by mx1.FreeBSD.org (Postfix) with ESMTP id 8F09043FA3 for ; Tue, 25 Mar 2003 19:59:39 -0800 (PST) (envelope-from dan@dan.emsphone.com) Received: (from dan@localhost) by dan.emsphone.com (8.12.7/8.12.7) id h2Q3xceL014581; Tue, 25 Mar 2003 21:59:38 -0600 (CST) (envelope-from dan) Date: Tue, 25 Mar 2003 21:59:38 -0600 From: Dan Nelson To: Terry Lambert Message-ID: <20030326035938.GF1713@dan.emsphone.com> References: <200303260034.aa92057@salmon.maths.tcd.ie> <3E81160B.E5406C60@mindspring.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3E81160B.E5406C60@mindspring.com> X-OS: FreeBSD 5.0-CURRENT X-message-flag: Outlook Error User-Agent: Mutt/1.5.4i X-Spam-Status: No, hits=-29.3 required=5.0 tests=AWL,EMAIL_ATTRIBUTION,IN_REP_TO,QUOTED_EMAIL_TEXT, REFERENCES,REPLY_WITH_QUOTES,USER_AGENT_MUTT autolearn=ham version=2.50 X-Spam-Level: X-Spam-Checker-Version: SpamAssassin 2.50 (1.173-2003-02-20-exp) cc: Ian Dowse cc: current@freebsd.org Subject: Re: [Re: NFS -current X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Mar 2003 03:59:41 -0000 X-List-Received-Date: Wed, 26 Mar 2003 03:59:41 -0000 In the last episode (Mar 25), Terry Lambert said: > Ian Dowse wrote: > > I'm not sure what you mean by a "lost" mount. Do all further > > accesses to the filesystem hang? > > > > It is normal enough to get the above 'not responding' errors > > occasionally on a busy fileserver, but only if they are almost > > immediately followed by 'is alive again' messages. > > Particularly when using UDP with a "rsize" or "wsize" larger than the > MTU, which Linux people do all the time. > > As you are using UDP... > > "If you hear hoofbeats, look for horses first, not zebras". UDP works just fine on a switched network. On my NFS servers I use an 8k rsize/wsize and UDP mounts on everything and have relatively few dropped fragments. Server 1 (NFS homedir server): 21:22 up 23 days, 8:02, 36 users, load averages: 0.00 0.01 0.00 ip: 1783574152 total packets received 520544166 fragments received 82873817 packets reassembled ok 15246 fragments dropped after timeout Server 2: 21:31 up 223 days, 13:17, 35 users, load averages: 0.19, 0.12, 0.09 ip: 2089844841 total packets received (rolled over 4 times) 3965873984 fragments received 668066863 packets reassembled ok 25596 fragments dropped after timeout (hmm whatever happened to the 64-bit network counters idea) -- Dan Nelson dnelson@allantgroup.com