NFS v4 Performance degradation

[Barry Brimer]

<snip>
> I've scoured every reference to nfs4 performance degradation I could find
> but nothing seems to call out what we are experiencing. A few retrans exist
> in nfsstat but nothing that stands out. Generally, everything "look" OK but
> clearly is not.

Have you tried testing with NFSOmeter? It may be able to help. I've not 
used it but it seems like it might be helpful.

<https://fedoraproject.org/wiki/Features/NFSometer>

Barry