NFS over UDP performance problem on RHEL6

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Dear RedHat users

I'm using NFSV3 over UDP for the home directories on a large RHEL6 client server.
-> Version 3 because my NFS server is only v3, fedora based and a little bit old.
-> UDP because it is an HA solution and, with TCP, NFS freeze when moving to the rescue server.
All this will change in the next months but I need time to setup a new HA solution.

With the home directory NFS mounted, working on the server is very slow: typing commands in a terminal show slowly each characters... But the server is runing fast when we launch applications on it (20 cores and 512Gb RAM) so the server is not overloaded.
Connected as root with homedir on the local disc the problem does not occur.
Mounting with tcp protocol does not show the problem but I cannot use this in the HA context. But this show that is is not a network bandwith problem (10Gb ethernet)

All other clients are CentOS6 or OpenSuse based and do not show this behavior, so it is not a NFS server overload problem too.

I will apprecriate any advice about RHEL nfs tuning for UDP protocol or howto investigate this strange problem.

Patrick

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