Date: Tue, 2 Aug 2011 22:38:05 -0400
From: Jim Rees <rees@umich.edu>
To: "Myklebust, Trond" <Trond.Myklebust@netapp.com>
Cc: Peng Tao <bergwolf@gmail.com>,
        "Adamson, Andy" <William.Adamson@netapp.com>,
        Christoph Hellwig <hch@infradead.org>, linux-nfs@vger.kernel.org,
        peter honeyman <honey@citi.umich.edu>
Subject: Re: [PATCH v4 00/27] add block layout driver to pnfs client
Message-ID: <20110803023805.GA4863@merit.edu>
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Myklebust, Trond wrote:

  Can you try to turn on the callback debugging ('echo 256 >
  /proc/sys/sunrpc/nfs_debug')? A wireshark trace of what is going on
  during the hang itself might also help.

It doesn't fail with callback debugging turned on.  I suspect the output to
my slow serial console disrupts the timing.

The trace is in
http://www.citi.umich.edu/projects/nfsv4/pnfs/block/download/089.pcap