[Bug 276299] Write performance to NFS share is ~4x slower than on 13.2

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276299

--- Comment #5 from Rick Macklem <rmacklem@FreeBSD.org> ---
There is very little difference in the NFS
server for 13.2 vs 14.0.
As such, the hit is most likely a network
fabric issue or a ZFS issue.

The only thing I can suggest to try is:
rsize=131072,wsize=131072

It should perform about as well as 1Mbyte, but???
If it does help a lot, there is something in the
network fabric (most likely the NIC/driver) that
cannot handle the burst of TCP segments well.

Did you happen to have "sync=disabled" set on your
13.2 ZFS.  Setting this runs the risk of data loss
when the NFS server crashes/reboots, but will help
w.r.t. write performance.

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