Re: nfs NULL procedure packets

From: J. Bruce Fields
Date: Thu Dec 04 2008 - 13:45:38 EST

On Wed, Dec 03, 2008 at 10:11:26AM -0800, Russell Miller wrote:
> Hi again, I was hoping someone here could answer another question. I
> apologize if these are easy questions...
> So a couple of days ago I was troubleshooting yet another NFS problem
> (not the non-one I described a few days ago). I sent a 1G file over
> to a server, did a TCP capture, and analyzed the results.
> I noticed a lot of NULL procedure packets. A *lot* of them. In some
> cases, one every 10 microseconds, and there were about 400,000 of them
> I captured.
> This seems like a lot of network traffic for very little reason.
> Is this normal behavior, or something I should investigate further?
> It seems to me like pinging the NFS server once every 10 microseconds
> is a major waste of bandwidth.

It's either a bug, or you're misreading the traces--how are you
identifying these as NULL procedures? Also, are they NULL NFS calls, or
some other rpc protocol? And are you using krb5?

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