S5520HCT and Win 2008 R2 Hyper-V

[idata]

Hi all,

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

Readd Hyper-V

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?

[Daniel_O_Intel]

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.

[idata]

Hi Dan_O,

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

[idata]

Hi 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?

[JasonT_Intel]

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.

[JasonT_Intel]

Intel just released a notification that a potential BIOS update may fix this issue. Will keep you posted once we get the official BIOS package.