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

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 13 Jan 2024 18:43:47 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276299

--- Comment #3 from dmilith <dmilith@me.com> ---
(In reply to Vladimir Druzenko from comment #2)

From the server:

vfs.nfsd.srvmaxio: 1048576
vfs.nfsd.maxthreads: 64

I've tried with 128 threads before, but that changed nothing. The server is…
close to being idle during the transfer.

From the btop I only see "intr" and "nfsd: server" subprocess… But both use up
to 15% CPU per process. Load is 0.7

Dropped the "sync" option on clients, and added "readahead=16". That caused the
write to speed up from 6MiB/s to 8MiB/s.

Should I consider modifying /boot/loader.conf to add:
"vfs.maxbcachebuf=1048576" there? It's mentioned in the 14.0 release docs.

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