[OpenIndiana-discuss] Should I see a major slowdown when rsyncing to zfs nfs share

[Harry Putnam]

Server setup: oi build 151_a9
zfs filesystem with nfs and root rw enabled on share.

zfs get sharenfs p0/rrsnap/gv
NAME          PROPERTY  VALUE                                    SOURCE
p0/rrsnap/gv  sharenfs  rw=@192.168.0.0/24,root=@192.168.0.0/24  inherited from p0/rrsnap

-------       -------       ---=---       -------       -------

client setup: Gentoo linux
Linux gv 3.18.0-gentoo #3 SMP Sun Dec 14 13:29:08 EST 2014 i686
The linux client is running as vbox guest on OI b 151_a9 HOST
-------       -------       ---=---       -------       -------

The rsync (in the form of an rsnapshot backup script) is being run on
the Gentoo Linux OS and writing to the zfs share shown above.

I see a major slowdown, maybe even a massive slowdown when writing to
the nfs mounted share when compared to writing to an on client-HOST
disc.

It's running now, and so I can't give the completion time yet but I'm
pretty sure it will be 4-5 times slower, so roughly 450 percent
slower.

Oh, and the amount of data being written is 1.3 GB

I'll have both exact times at some point up ahead. I didn't think to
time the on client-host run.  I wasn't planning on changing to
writting to an nfs share, but I can tell by watching the crawling
output that it is orders of magnitude slower.

I'm pretty sure it would be faster over ssh but haven't tried that
yet.

Is this really abnormal?  Can any of you give some idea what I should
be expecting here?