TCP/IP Tunning

Open Network adapters “advanced” properties tab in NIC driver properties. Disable all NIC “Offload” settings that are found

On the Windows server, click Start > Run and enter regedit.
To be on the safe side, make a backup of the current registry (File > Export).
TCP Tuning done as below :-
– HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
– Value Name: TcpTimedWaitDelay
– Data Type: REG_DWORD
– Value: 30

– Value Name: TcpMaxDataRetransmissions
– Data Type: REG_DWORD
– Value: 10

– Value Name: TcpMaxConnectRetransmissions
– Data Type: REG_DWORD
– Value: 3

– Value Name: KeepAliveTime
– Value Type: REG_DWORD-time in milliseconds Valid Range: 1-0xFFFFFFFF
– Value: 900000
All above are decimal values

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Make sure that Link speed and Duplex is set to ” Auto Negotiation” [It should be set the same way on the switch to which it is connected]

Disable netdma
netsh int tcp set global netdma=disable
netsh int tcp set global rss=disabled
Disable chimney
netsh int tcp set global chimney=disable

NOTE : A reboot of the server is required to effect the registry above changes