Kbase P1290: What Is the TCP-NODELAY option in 4GL Sockets
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
16/10/2008 |
|
Status: Verified
GOAL:
What Is the TCP-NODELAY option in 4GL Sockets
FACT(s) (Environment):
Progress 9.x
OpenEdge 10.x
FIX:
The TCP-NODELAY is actually an option in the TCP/IP stack, therefore what follows is a description based on the documentation for various operating systems, and may not apply to your specific TCP/IP implementation. Each time a workstation sends a network packet to another one, the receiving workstation must send an ACK (acknowledgement packet) back to the sender. This is the basic idea that makes TCP/IP a reliable protocol. Usually, this acknowledgement packet is delayed for a small amount of time in the hope to combine the acknowledgement of several TCP/IP packets in one single reply (this mechanism is named 'delayed ACK'). Similarly, the sending workstation will try and collapse a few small TCP messages to a given receiver in one single network packet (this mechanism is named 'Nagle algorithm'). TCP-NODELAY disables both the delayed ACK and the Nagle algorithm on sockets.