Have an Virtual Maching that have big network performance problems, the host machine has not. I have tried all advanced network settings, like disable TCP Checksum Offload, that some tell you to test. Have two network adapters on the HOST-MACHINE with the same settings the second one is for the Hyper-V Machine.
The lastest driver on the NIC is installed.
Copy performance 500 KB/S over Gigabit LAN in booth directions. When I disabled the TCP Checksum the performance went down. I have tried all of the settings on booth VM and HOST network.
Any more ideas?