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Re: [lwip-users] Re transmission behaviour?


From: Kieran Mansley
Subject: Re: [lwip-users] Re transmission behaviour?
Date: Mon, 02 Jul 2012 15:41:17 +0100

On Mon, 2012-07-02 at 15:23 +0200, Simon Goldschmidt wrote:
> "Pomeroy, Marty" <address@hidden> wrote:
> > > The TCP_TMR_INTERVAL is the time the stack should wait for an ACK from
> > my master, right? 
> > 
> > Yes, before it re-transmits.
> 
> Is that so? I would have thought that slow-retransmission depends on
> the connection's RTO (which is normally an order of magnitude slower
> than 250ms!) while fast-retransmission does not depend on timer
> intervals but is triggered by receiving 2 dup-ACKs.

Simon's right.  The estimation of the RTO though may be (i) measured in
slow timer ticks; and (ii) potentially much less than 1 slow timer tick.
In these cases the stack will wait for exactly TCP_TMR_INTERVAL.  In
cases where the RTO is measured to be more than that it will wait
longer.

Kieran




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