with vhost enabled.:
--------------------------

RHEL5.5                                   e1000                    rtl8139
----------------                      ------------------             -----------------                                      

1. nic_promisc                         PASS                          PASS
2. nic_driver_unload                   PASS                          PASS
3. netperf                             FAIL                          FAIL
4. multicast                           PASS                          PASS
5. mac_change                          FAIL                          FAIL
6. jumbo                               FAIL                          PASS
7. file_transfer                       FAIL                          FAIL
8. ethtool                             PASS                          FAIL(expected)
9. ping                                PASS                          PASS

RHEL6.0                                 e1000                  rtl8139
---------------                     ----------------         --------------------
1. nic_promisc                         FAIL                          FAIL              
2. nic_driver_unload                   FAIL                          FAIL
3. netperf                             FAIL                          FAIL
4. multicast                           PASS                          PASS
5. mac_change                          FAIL                          FAIL
6. jumbo                               FAIL                          PASS
7. file_transfer                       FAIL                          PASS
8. ethtool                             FAIL                          FAIL(expected)
9. ping                                PASS                          PASS