[Bug 277197] NFS is much too slow at 10GbaseT

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277197

--- Comment #3 from Hannes Hauswedell <h2+fbsdports@fsfe.org> ---
I can confirm that rsize and wsize do not influence the performance of the
Linux NFS3 client strongly; choosing values between 128KiB and 1MiB, I always
get  550-600MiB/s.

The Linux client is however strongly influenced by device mtu. I am currently
operating both server and client at an mtu of 9000. If I lower the mtu to 1500,
the Linux client performs *very similar* to the FreeBSD client (at any mtu),
delivering 200-250 MiB/s.

I think, it is strange that the FreeBSD NFS client does not benefit from a mtu
higher than 1500. Could this be a hint at what's going wrong?

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