We have 3 servers with this board in an intel SC5600LX chassie. When we add the roll Hyper-V the network performance drops by an order of 10.
What we have done;
Install Windows 2008 R2 run all updates
test speed and get ~100M
Add Hyper-V roll and reboot
Test speed and get ~5M
Remove Hyper-V and reboot
Test speed and get ~100M
Turn off all offload settings in NIC Card settings
Turn off in Netsh
Play with buffers
Use both Microsoft provided NIC drivers and latest Intel drivers
Added 4 port Intel I340-T4
Allways same result.
Any ideas please?
Press F2 during POST->BIOS setup pageà Advanced-> Processor Configuration -> set Intel(R) VT for Directed I/O Enable; set Coherency Support Enable; set ATS Support Enable; set Pass-through DMA Support Enable.
Thanks, that seems to have done the trick.Microsoft support had disabl;e the driver called passthruparser - so these setting effect this driver.
Press F2 during POST->BIOS setup pageà Advanced-> Processor Configuration ->
set Intel(R) VT for Directed I/O Enable - This was enabled
set Coherency Support Enable - This was not
set ATS Support Enable - this was not
set Pass-through DMA Support Enable - this was not
We will test this against the other two systems we have and advise.
Thanks again Dan_O