[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 #12 from Rick Macklem <rmacklem@FreeBSD.org> ---
If you are playing with network related stuff,
here's a bit more (no pun intended;-).

Look at any stats generated by both server
and client NIC drivers for errors, etc.

If you have a different NIC lying about, particularily
if it has a different chipset in it, try it.

Look for a tunable in the NIC driver that adjusts
interrupt moderation. Interrupt moderation is good
for streaming traffic, not so good for NFS.  Once
a NFS client sends an RPC message, it waits for a
response. Any delay in the reply, slows it down and
interrupt moderation can delay the interrupt and,
therefore, the RPC reply.

And don't forget simple stuff like cables. They can
get damaged at any time.

Good luck with it, rick

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