Public bug reported:
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/null 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.
** Affects: nfs-utils (Ubuntu)
Importance: Undecided
Status: New
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nfs4 issue running with udp
https://bugs.launchpad.net/bugs/601688
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