[lwip-users] Re: [lwip] RTO by Retransmissions ?

[leon . woestenberg]

Hello,

I think Peder Kruse did indeed found a bug.

Can some of the TCP people confirm this?


{ 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };

must be

{0, 1, 2, 3, 4, 5, 6, 6, 6, 6, 6, 6 };

Leon.


----

Wandering through the tcp.c source I started wondering:

const u8_t tcp_backoff[13] =
    { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
tcp_slowtmr(void)
...
...
   pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];

rto being an u16_t, will it not go zero by nrtx == 4 at the latest ?


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