Optimal iSCSI NIC settings

This can help eliminate TCP retransmits between EQL and the host.Find the 2x iSCSI NICs in the registry, only change this for NICs connecting to iSCSI storage.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces

Create two new DWORDS


TcpAckFrequency = 1
TcpDelAckTicks = 0

Restart the server.

Enable TSO and LRO on the NIC if you have the option, VMXNET3 can do this.

http://support.microsoft.com/kb/328890
http://support.microsoft.com/kb/2020559
http://smallvoid.com/article/winnt-nagle-algorithm.html