From mboxrd@z Thu Jan  1 00:00:00 1970
From: Vincent JARDIN <vincent.jardin-pdR9zngts4EAvxtiuMwx3w@public.gmane.org>
Subject: Is VFIO driver's performance better than IGB_UIO?
Date: Fri, 08 Aug 2014 11:23:33 +0200
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> My cpu is "Intel(R) Xeon(R) CPU           E5620  @ 2.40GHz"

It is a Westmere if I am correct. So,use UIO.