Vmware network adapters

http://kb.vmware.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&docTypeID=DT_KB_1_1&externalId=1001805

to load the e1000 Gigabit driver kernel module in gentoo / linux

modprobe e1000

iperf statistics

vmware adapter type	throughput
Flexible	75 Mb/sec
E1000	255 Mb/sec