From: Chris Worley <cworley@lnxi.com>
Subject: NFS not negotiating MTU correctly?
Date: 25 May 2004 07:18:46 -0600
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I don't know why this is an NFS specific problem (I'd think this would
be part of IP)...

I run 9K MTU's on all my NFS servers and most of my clients.  Great
performance (the servers are also channel bonded... but that's
irrelevant).

Clients that can't do 9K MTU's work with the 9K MTU systems for all
sorts of network tasks, except NFS.

To get NFS to work, I either have to use NFS over TCP, or set my w/rsize
below 1500 bytes.  Both cause performance problems.

In grilling my switch vendor, they assure me that it's the client &
servers job to negotiate properly fragmented packets based on the lessor
MTU.

Chris



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