This is a very interested thread. I just played little bit with dd on my desktop machine running OpenBSD 5.9 amd64 NFS-client. NFS server runs on DragonFly BSD 4.4.2. No optimization of any kind has been done. My home network is 1 Gigabit. I will play over the weekend with various block sizes and try to use iozone to get something more interesting.
UDP mount write: 17.014003 MB/s read: 22.397014 MB/s TCP mount: write: 9.338817 MB/s read: 20.47062 MB/s Best, Predrag P.S. Yes under the NFS DF is using HAMMER so I am able to get history, snapshot, and all that nifty stuff.
