[Bug 601688] Re: nfs4 issue running with udp

[Timo Aaltonen]

Running v4 on top of UDP is unsupported, see for instance
https://bugzilla.redhat.com/show_bug.cgi?id=606260

** Bug watch added: Red Hat Bugzilla #606260
   https://bugzilla.redhat.com/show_bug.cgi?id=606260

** Changed in: nfs-utils (Ubuntu)
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/601688

Title:
  nfs4 issue running with udp

Status in “nfs-utils” package in Ubuntu:
  Won't Fix

Bug description:
  i'm not exactly sure if this is really a nfs related problem or a kernel issue.
  i'm running a nfs4 server with udp. mount settings are rw,soft,proto=udp,port=2049. no rsize and wsize set (32010 is the default??).
  my network is a default ethernet with MTU 1500. now when i do 
  > dd if=/dev/zero of=/home/.. 
  where /home is on the remote nfs server, i get "dd: writing to '/home/..': Socket operation on non-socket" as error message after some seconds and about 70mb transferred.
  reducing the rsize and wsize to far smaller sizes (e.g. 8192) solves the problem. so is it a nfs-related issue or a kernel-bug in the ip fragmentation code or similar? the error is very well reproducible.

  system is ubuntu 10.04 server, current patchlevel.

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