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Re: tcp_tick
> For what is the variable, "tcp_tick" used in NS?
As I understand it, tcp_tick is used to model the granularity that may be
present in a system clock. So, if the system clock can only provide
measurements accurate to 0.1 seconds, tcp_tick should be set to 0.1 - this
is the default.
The measurements made by the TCP agent are all measured in terms of the
tcp_tick. In particular, the RTT is measured in terms of the tcp_tick - so
say the RTT value obtained from the agent is 6, and the tcp_tick has a
value of 0.1, then the agent is estimating the RTT to be 0.6=600ms.
If you change the value of the tcp_tick, you are enabling the tcp agent to
make more accurate measurements of the RTT.
Sean.
-----
Sean Murphy, Email: [email protected]
Teltec Ireland, Phone: +353-1-7045080
DCU, Dublin 9, Fax: +353-1-7045092
Ireland.