Hi,
I've read the following article which says the enhanced vmxnet network adapter should be used for TSO:
http://pubs.vmware.com/vsphere-esxi-4-1-installable/wwhelp/wwhimpl/js/html/wwhelp.htm#href=server_config/c_enabling_tso.html#1_10_9_11_6_1
Once that's done I believe you need to enable TSO in the operating system (for example Windows) by enabling it in the NIC advanced settings and then enabling TCP Chimney Offload:
http://support.microsoft.com/kb/951037
My question is, should I use the enhanced vmxnet adapter or the E1000 adapter (which also supports TSO)? My physical NICs are Intel Gigabit 82576 (igb) adapters and Broadcom Gigabit BCM5709 (bnx2).
Cheers