Hyper-V core NIC speeds

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Good afternoon,
On a Dell PE T610 I have Hyper-V core running, with 2 x Broadcom BCM5709C NetXtreme II GigE installed. I have noticed that copying large files 17GB for example, from a network physical server to the Hyper-V host local drive [not vm guest] is very slow in comparison to copying from Physical to Physical servers.

Copying a 17GB file physical to Hyper-V host takes 30 minutes
Copying a 17GB file physical to physical host takes 15 minutes

Can someone tell me exactly what registry nodes I should disable on Hyper-V NICs to improve performance. So far I have gone to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002BE10318} and set the following to 0 on both physical NICs:
*LSOv1IPv4
*LSOv2IPv6
*TCPUDPChecksumOffloadIPv4
*TCPUDPChecksumOffloadIPv6

Should I also disable *TCPConnectionOffloadIPv4 & *TCPConnectionOffloadIPv6?

Many thanks in advance

 

Hi Ken,
Its Server 2008 Core R2, I can confirm physical NIC drivers are the latest and "Chimney" is enabled, the driver update forced this.

Very strange.