I've just checked my Solarwinds Top 10 and found that my five ESXi 5 servers are generating up to 500 Million (!) receive discards per day each on the vmnic interfaces (and 0 transmit discards).
I have HP Blades with Flex Fabric connected to Nexus (all 10Gb), although the Blades NICs share their 10Gb between 3 ethernet NICs and 1 HBA.
Can anyone recomend where to begin to figure out why this is happening?