From: Grant Coady Subject: Re: NFS regression? Odd delays and lockups accessing an NFS export. Date: Wed, 20 Aug 2008 11:10:14 +1000 Message-ID: <75rma4544lqk5otlk58jjcn4kf5kb27fm7@4ax.com> References: <1219087258.7192.19.camel@localhost> Reply-To: Grant Coady Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Grant Coady , linux-kernel@vger.kernel.org, neilb@suse.de, bfields@fieldses.org, linux-nfs@vger.kernel.org To: Trond Myklebust Return-path: Received: from relay03.mail-hub.dodo.com.au ([123.2.6.238]:47505 "EHLO relay03.mail-hub.dodo.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754795AbYHTBKm (ORCPT ); Tue, 19 Aug 2008 21:10:42 -0400 In-Reply-To: <1219087258.7192.19.camel@localhost> Sender: linux-nfs-owner@vger.kernel.org List-ID: Hi Trond, On Mon, 18 Aug 2008 15:20:58 -0400, Trond Myklebust wrote: >On Mon, 2008-08-18 at 12:02 +1000, Grant Coady wrote: >> Hi there, >> >> I've been using NFS here for years, lately there's something odd going on >> since about a month or so. Previously reported last month: >> http://www.gossamer-threads.com/lists/linux/kernel/951419?page=last >> >> Now with 2.6.27-rc3 on one of the client boxes I get a complete stall >> at odd times when accessing the server's exported directory, cannot >> see a pattern to it. Eventually recovers after a Ctrl-C. Nothing in >> the server or client log files. Not easy to reproduce either. >> >> The server runs 2.6.26.2 at the moment. >> >> Server config, etc: http://bugsplatter.id.au/kernel/boxen/deltree/ >> Client config, etc: http://bugsplatter.id.au/kernel/boxen/pooh/ > >Please try to reproduce the hang, then do > > echo 0 >/proc/sys/sunrpc/rpc_debug > >and send the output from 'dmesg'... dmesg and logs from client machine showed nothing, dmesg from server: -pid- proc flgs status -client- -prog- --rqstp- -timeout -rpcwait -action- ---ops-- (nothing, nada, zilch after what looks like the header line) Situation, first use of 'df' after reboot, client machine hung for many seconds before the /home/common export showed up, this is not repeatable. Mounting another export and doing 'df' again had no delays. Client is running 2.6.27-rc3-git5 (x86_64) at the moment, configs, etc at: http://bugsplatter.id.au/kernel/boxen/pooh64/ Server as above. Am I supposed to have some debugging turned on in the .configs? Grant.