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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P=E5 ty , 25/05/2004 klokka 09:18, skreiv Chris Worley:
> 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.
That sounds like a piss-poor switch to me. AFAIK all routers are
supposed to automatically fragment datagrams when forwarding between
networks that have a different MTU. Automatic MTU discovery is not part
of the IP protocol (although methods for doing so under certain
circumstances do exist).
In any case, dealing with MTUs is entirely the networking layer's job.
NFS just deals with sockets. I suggest that you check that the
ip_no_pmtu_disc sysctl is set correctly, and then check with the Linux
networking mailing list ([email protected]) if there are further
problems.
Cheers,
Trond
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