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

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Message-ID: <20080831194609.GC14876@fieldses.org>
Date:	Sun, 31 Aug 2008 15:46:09 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Ian Campbell <ijc@...lion.org.uk>
Cc:	Tom Tucker <tom@...ngridcomputing.com>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	John Ronciak <john.ronciak@...il.com>,
	Grant Coady <gcoady.lk@...il.com>,
	linux-kernel@...r.kernel.org, neilb@...e.de,
	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 Sun, Aug 31, 2008 at 08:44:02PM +0100, Ian Campbell wrote:
> On Sun, 2008-08-31 at 15:30 -0400, J. Bruce Fields wrote:
> > On Sat, Aug 30, 2008 at 04:47:41PM +0100, Ian Campbell wrote:
> > > On Wed, 2008-08-27 at 09:43 -0500, Tom Tucker wrote:
> > > > Sure. I've actually tried to reproduce it here unsuccessfully.
> > > > 
> > > > As a starter, I would suggest turning on transport debugging:
> > > > 
> > > > # echo 256 > /proc/sys/sunrpc/rpc_debug
> > > > [...]
> > > > If Ian is willing to create the log (or already has one), I'm
> > > > certainly willing to look at it.
> > > 
> > > It produced only the following (is that what was expected?):
> > > 
> > > [146866.448112] -pid- proc flgs status -client- -prog- --rqstp- -timeout -rpcwait -action- ---ops--
> > > [146866.448112] 30576 0001 00a0      0 f77a1600 100003 f7903340    15000 xprt_pending fa0ba88e fa0c9df4
> > > [146866.448112] 30577 0004 0080    -11 f77a1600 100003 f7903000        0 xprt_sending fa0ba88e fa0c9df4
> > 
> > It's normal to get something like that when you turn it on, yes (unless
> > someone else spots anything odd about that...) but what's really needed
> > is to turn this on and then reproduce the problem--it's the debugging
> > output that goes to the logs during the problem that'll be interesting.
> 
> That's what I did. The first time I did the echo I just got the header
> line, then I waited for the repro and since there had been no further
> logging I ran the echo again and got the three lines above.
> 
> Sounds like you expected there to be more and ongoing logging?

Yes.  It's the server side we're interested in, by the way--are you
collecting this deubgging on the client?

--b.
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