I've seen issues pop up with intel quad ports here and there on the forums so I thought it would be good to note down what worked here.
Though I have not experienced this myself hopefully it can assist someone.
Example problems from one specific thread:
One solution was to replace the nic card. That’s pricey.
Another from: aqualityplacem
"
Solved, the default interuppt rate for this driver is set as adaptive. After talking to VMware (took 3 weeks to get to someone who knew their stuff) I have had much better results setting this at a fixed rate
esxcfg-module -s InterruptThrottleRate=8000,8000,8000,8000 igb
esxcfg-module -g igb showes what setting you have
this will require a reboot.
The higher rate may use more CPU, but when running a sequential IO test the CPU hit 750mhz
you have 8000 in four times becuase you have four ports on the card.
I have tried other values, 4000 was about 10% slower, I didnt record the CPU hit. Going to stick with 8000
write speed as gone from 35MB/sec to 105MB/sec"
Pasted from <http://communities.vmware.com/message/2136642#2136642>
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