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
After some more testing I found that I still had two drivers for Hyper-V disbale.
After reenabling the drivers the problem still happen enevwith the bios setting turned on.
Any other ideas?
Can you try Enabling the option of Maximize Memory below 4GB under BIOS, you can find this under Advanced-> PCI Configuration -> Maximize Memory below 4GB (default is Disabled). See if it helps.