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From: "Daniel Corbe" <corbe@corbe.net>
To: <freebsd-questions@freebsd.org>
Subject: em0: watchdog timeout -- resetting
Date: Thu, 12 Dec 2013 13:44:22 -0500
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Hi list,

I’ve been having an issue with a server for a few weeks now.  Whenever I put 
it under any sort of network load (as low as 8Mbit/sec) I get the above 
error on the console and the server completely loses network connectivity. 
The only way to bring it back into service is to completely restart the box. 
ifconfig ... down and ifconfig ... up doesn't work and neither does issuing 
an /etc/rc.d/netif restart.

I've been poking around with google trying to help myself to no avail.   The 
usual suggestions of ((disable MSI), (watchdog -t 0), (replace the NIC with 
something made for a server)) did not work and I'm honestly at a loss of 
where to even begin from here.  I'd appreciate any suggestions.