We had the problem noted in this VMware Knowledge Base article: http://kb.vmware.com/kb/2014323
Per the article, we had to disable MSI-X on our QLogic 8142 CNA cards when we were on ESXi 5.0. We are in the process of upgrading to ESXi 5.1. Has this problem been resolved in ESXi 5.1 so that I can re-enable the setting?
NOTE: I have updated the firware on our QLogic Cards to the latest version.
Thanks!