From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: xen host going down: transmit queue 0 timed out
Date: Thu, 4 Feb 2016 12:48:31 -0500
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> The problem usually occurs over night while the machine is idle.
> 
> The problem exclusively occurs on the machine running xen.  None of
> the others are showing any issues whatsoever.

Try limiting the C states. Use the xenpm.