After reading some posts and blogs on vSphere5 and E1000E performance my curiosity was triggered to see if actually all these claims make sense and how vSphere actually behaves when testing. Test setup The setup I used is similar as described inhttp:
1. Login to vCenter via vSphere client. go to the vm 2. create a 1G new disk(SCSI 1:2) for the VM temperary 3. change scsi controller1 to paravirtual from Logical LSI SAS 4. Boot VM, and upgrade VMtools 5. Shutdown the VM 6. remove the new disk(SCSI