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Date: Mon, 24 Sep 2012 20:01:49 -0400
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From: Ryan Stone <rysto32@gmail.com>
To: "Rudy (bulk)" <crapsh@monkeybrains.net>
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Cc: freebsd-net <freebsd-net@freebsd.org>
Subject: Re: ping: sendto: No buffer space available
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Can you get the output of netstat -I emX -d?  You don't need to run
that when the problem is happening -- you just need to run it on the
machine after it exhibits the issue without any reboots in the
interim.

I suspect that you are seeing the em TX queue fill up.  If so you
should see output drops reported by the em interface.