I have a server HP Proliant DL180 G6, with 2 gigabit ethernet interface.
I installed ESX 4.1.0, and installed 2 virtual machine, one Windows Server 2008 R2 and one Cento 6.
The problem is network transfer hate, in both vm. My switch is Cisco Catalyst 2690, with all ports configured like autoconfiguration. I Esx i configured like autoconfiguration, and force 100Mbps, but anyway transfer rate continue slow, average 102Kps  .

I was installed just WS2K2R2, and network works fine.

Ps: sorry, my english is bad 

Network transfer rate is too much slow