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From: Peng Tao <bergwolf@gmail.com>
Date: Wed, 3 Aug 2011 16:43:32 +0800
Message-ID: <CA+a=Yy6ajY+Te6ij3KTM0sNSf-jjFVubReqWLJ5UnN8cuhdidQ@mail.gmail.com>
Subject: Re: [PATCH v4 00/27] add block layout driver to pnfs client
To: Jim Rees <rees@umich.edu>
Cc: "Myklebust, Trond" <Trond.Myklebust@netapp.com>,
        "Adamson, Andy" <William.Adamson@netapp.com>,
        Christoph Hellwig <hch@infradead.org>, linux-nfs@vger.kernel.org,
        peter honeyman <honey@citi.umich.edu>
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Sender: linux-nfs-owner@vger.kernel.org
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On Wed, Aug 3, 2011 at 10:38 AM, Jim Rees <rees@umich.edu> wrote:
> 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
In frame 8785, client returned NFS4ERR_DELAY in response to
CB_SEQUENCE and the next RPC was 12s later. So it should be the case
that Trond mentioned above.

-- 
Thanks,
Tao