From owner-freebsd-fs@FreeBSD.ORG Wed Jan 12 10:23:25 2011 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 088D0106564A for ; Wed, 12 Jan 2011 10:23:25 +0000 (UTC) (envelope-from rs@bytecamp.net) Received: from mail.bytecamp.net (mail.bytecamp.net [212.204.60.9]) by mx1.freebsd.org (Postfix) with ESMTP id 365B38FC1E for ; Wed, 12 Jan 2011 10:23:23 +0000 (UTC) Received: (qmail 78468 invoked by uid 89); 12 Jan 2011 10:56:43 +0100 Received: from stella.bytecamp.net (HELO ?212.204.60.37?) (rs%bytecamp.net@212.204.60.37) by mail.bytecamp.net with CAMELLIA256-SHA encrypted SMTP; 12 Jan 2011 10:56:43 +0100 Message-ID: <4D2D7ADB.3090902@bytecamp.net> Date: Wed, 12 Jan 2011 10:56:43 +0100 From: Robert Schulze Organization: bytecamp GmbH User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.13) Gecko/20101208 Thunderbird/3.1.7 MIME-Version: 1.0 To: freebsd-fs@freebsd.org Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Subject: nfs and dropped udp datagrams X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 Jan 2011 10:23:25 -0000 I wonder how big kern.ipc.maxsockbuf shall be tuned on a busy NFS-Server. In the last time, I often see clients loosing connection to their mounted directories. Furthermore, I see increasing counts for upd datagrams "dropped due to full socket buffers" in netstat -s -p udp. The mbuf situation does not seem to be the reason for the lost connections, vmstat -z shows 0 failures in the mbuf section. Are there any other tunables which could prevent loss of connection to the server? What is a reasonable value for maxsockbuf? With kind regards, Robert Schulze