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Re: [lwip-users] Re transmission behaviour?

From: Fred39
Subject: Re: [lwip-users] Re transmission behaviour?
Date: Mon, 2 Jul 2012 01:52:41 -0700 (PDT)

Good morning and a good start in the week LWIP users :)

Kieran suggestion is true. The other ends delayed ACK timer should time out
and send a ACK so there shouldn't be a retransmission. But this is not
My suggestion is: 
- When i set the master fast like i said before 1ms it also send the ack for
the response very fast so a retransmission is not happening.
- When i set the master slow the ack of the master comes to late, so lwip
makes retransmission.

So when i set the TCP_TMR_INTERVAl very high like "7200000" the
retransmission happens but only a few times in a big interval. I guess in
this case the timer is just used once in that big interval

My Questions are:
Would this crash the system in future if the TCP_TMR_INTERVAl is set so
high? What would happen if i dont use the tcpip_tcp_timer in a longtme
runing system?
I observed if i dont use the timer that i dont get a retransmission anymore
obviously the retransmission function is not called.

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