The version of the driver you have is a bit dated. I would try the latest which available from VMware at:
http://www.vmware.com/resources/compatibility/detail.php?deviceCategory=io&productid=12665&deviceCategory=io&partner=46&releases=171&deviceTypes=6&pFeatures=65&vioSolutions=Standard - IO Devices&page=1&display_interval=10&sortColumn=Partner&sortOrder=Asc - IO Devices&page=1&display_interval=10&sortColumn=Partner&sortOrder=Asc
If this still does not work, I am afraid you will need to open a customer case with VMware, they actually own this driver. If in turn VMware needs Intel's assistance, they will contact us.
Best of luck,
Updating to the latest driver worked and allowed me to tune the ring size. I was using the driver that came with an HP custom image. Thanks for your help!