[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 #13 from Rick Macklem <rmacklem@FreeBSD.org> ---
I just played around on my old dell laptop
(which is running something close to 14.0).

I mounted it locally (so it is using lo0) and
I see a reasonable write rate when I do:
# dd if=/dev/zero of=/mnt/xxxx bs=1M count=1000
(about 200Mbytes/sec)

but if I do:
# dd if=/tmp/somefile of=/mnt/xxxx bs=1M
I see much slower writing (about 30Mbytes/sec).
I'll try UFS and see if I see the slow writing there as well.

I am wondering if ZFS has changed the way it
does compression? (I know so little about ZFS,
I don't even know how to turn compression on/off
on ZFS.)

Btw, you could try using /dev/zero for input.
You could also try doing a local mount on the
NFS server (which gets the network out of the
picture and only uses lo0).

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