From owner-freebsd-fs@FreeBSD.ORG  Mon Sep 14 13:28:56 2009
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Date: Mon, 14 Sep 2009 16:28:51 +0300
From: Andriy Gapon <avg@icyb.net.ua>
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To: John Baldwin <jhb@freebsd.org>
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Cc: freebsd-fs@freebsd.org, qing.li@bluecoat.com, freebsd-current@freebsd.org
Subject: Re: NFS client defaults to a mix of UDP and TCP
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on 14/09/2009 15:58 John Baldwin said the following:
> 
> Yes.  I know of folks would love to have NFS use only TCP, including the 
> initial RPC portmapper requests.  IMO an NFS mount should use TCP for 
> everything and a UDP mount should use UDP for everything by default.
> 

And another fact - it seems that NFS umount unconditionally uses UDP for "something":

/*
 * Report to mountd-server which nfsname
 * has been unmounted.
 */
if (ai != NULL && !(fflag & MNT_FORCE) && do_rpc) {
        clp = clnt_create(hostp, MOUNTPROG, MOUNTVERS, "udp");
...

-- 
Andriy Gapon