linux-kernel - Re: NFS regression? Odd delays and lockups accessing an NFS export.

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Date:	Fri, 22 Aug 2008 19:13:38 +0100
From:	Ian Campbell <ijc@...lion.org.uk>
To:	Trond Myklebust <trond.myklebust@....uio.no>
Cc:	Grant Coady <gcoady.lk@...il.com>, linux-kernel@...r.kernel.org,
	neilb@...e.de, bfields@...ldses.org, linux-nfs@...r.kernel.org,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	PJ Waskiewicz <peter.p.waskiewicz.jr@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	e1000-devel@...ts.sourceforge.net
Subject: Re: NFS regression?  Odd delays and lockups accessing an NFS
	export.

On Fri, 2008-08-22 at 11:08 -0700, Trond Myklebust wrote:
> On Fri, 2008-08-22 at 11:23 +0100, Ian Campbell wrote:
> > On Mon, 2008-08-18 at 15:20 -0400, Trond Myklebust wrote:
> > > Please try to reproduce the hang, then do
> > > 
> > > 	echo 0 >/proc/sys/sunrpc/rpc_debug
> > > 
> > > and send the output from 'dmesg'...
> > 
> > I've also been seeing some NFS related lockups, although I'm not sure if
> > they are the same as the one in this thread or not. Client is 2.6.26
> > (Debian's kernel) and Server is 2.6.25 (also a Debian kernel, but from
> > backports.org).
> > 
> > rpc_debug on the server gives nothing, on the client gives:
> > [144741.637997] -pid- proc flgs status -client- -prog- --rqstp- -timeout -rpcwait -action- ---ops--
> > [144741.637997]  3439 0004 0080    -11 f3f48200 100003 f7770000        0 xprt_sending fa0ae88e fa0bddf4
> > [144741.637997]  3438 0001 00a0      0 f77f2a00 100003 f77700d0    15000 xprt_pending fa0ae88e fa0bddf4
> 
> That's probably also a networking device driver issue candidate: your
> RPC task is queued up waiting to be sent.
> 
> What networking card+device driver are you using here?

# ethtool -i eth0
driver: e1000
version: 7.3.20-k2-NAPI
firmware-version: N/A
bus-info: 0000:01:0a.0

Adding CC's to peeps listed in MAINTAINERS

I have to reboot the system now (or else there will be no TV to watch
during my tea ;-). It will probably repro again quite soon though.

> > There are no processes running with pid 3439 3438 (I don't think it's
> > that sort of pid though).
> 
> The 'pid' is an internal RPC cookie that just serves to identify and
> track specific RPC requests.

Right, thanks.

Ian.

-- 
Ian Campbell

Colors may fade.

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