JSI Tip 0730. Improve TCP performance

Starting with SP2, Windows NT can implement the Van Jacobson TCP fast retransmit and recovery algorithm to quickly retransmit missing segments upon the receipt of n ACKS, without waiting for the retransmission timer to expire.

To implement the Van Jacobson algorithm, edit:

HKEY_LOCAL_MACHINE/SYSTEM/currentcontrolset/services/tcpip/parameters

Add Value name TcpMaxDupAcks, a type REG_DWORD, and set the value to the n (number) of ACKs. The range is 1-3 and the default is 2.