linux-kernel - nfs NULL procedure packets

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Message-ID: <4eea36270812031011x5f014b04q352af666cacb2f93@mail.gmail.com>
Date:	Wed, 3 Dec 2008 10:11:26 -0800
From:	"Russell Miller" <duskglow@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: nfs NULL procedure packets

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.

--Russell
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