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Date: Thu, 13 Feb 2003 21:30:48 +0000
From: Dave Jones <davej@codemonkey.org.uk>
To: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: 2.5.60 NFS FSX
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	Trond Myklebust <trond.myklebust@fys.uio.no>,
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On Thu, Feb 13, 2003 at 10:12:58PM +0100, Trond Myklebust wrote:

 > > There seems to be some garbage at the end of the capture.  I'm
 > > not sure why, but it seems tcpdump does that sometimes.
 > Does it do that on 2.4.x? I've certainly never seen that happen on a
 > stable kernel.

I'll try in a few minutes. It doesn't always do it in 2.5, just like
once every dozen or so captures.  NIC is a 3com 3c905C-TX/TX-M [Tornado]
in the client, and an Intel 82801BA/BAM/CA/CAM in the server, both
boxes connected through a cheapo 100MB switch. Nothing special.

 > In fact ethereal reports 
 > 
 >  Message: pcap: File has 1045168887-byte packet, bigger than maximum of 65535
 > No wonder we see bizarre crashes...

That did seem odd yes.  I put it down to a tcpdump bug.
But if you think thats whats triggering it...

 > There are several other odd features in this tcpdump. Random UDP
 > packets from the server to the client with a junk payload (usually
 > consisting of a load of zeros) appear to be pretty frequent.

Wacky. Interested netdev parties can find the ~2MB tcpdump output at
http://www.codemonkey.org.uk/cruft/tcp-trond.bz2
(please don't hammer that server with requests for this unless you
 really do want/need it - the mind boggles at how many hits the nfs
 fsx dumps got in the past -- I'm sure we don't have *that* many
 interested NFS developers 8-).

 > Is this against a 2.5.x server? If so, could you try against a 2.4.x
 > or a non-linux server?

This is a 2.4.21pre3 server.  No non-linux servers to try against
right now..

		Dave

-- 
| Dave Jones.        http://www.codemonkey.org.uk
| SuSE Labs
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