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

From: Peder Kruse
Subject: [lwip-users] [lwip] RTO by Retransmissions ?
Date: Thu, 09 Jan 2003 00:39:11 -0000 
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Wandering through the tcp.c source I started wondering:

const u8_t tcp_backoff[13] =3D
    { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };

tcp_slowtmr(void)
...
...
   pcb->rto =3D ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];

rto being an u16_t, will it not go zero by nrtx =3D=3D 4 at the latest ?

Peder


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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.2800.1106" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Wandering through the tcp.c source =
I&nbsp;started=20
wondering:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>const u8_t tcp_backoff[13] =
=3D<BR>&nbsp;&nbsp;&nbsp;=20
{ 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };<BR></FONT></DIV>
<DIV><FONT face=3DArial size=3D2>tcp_slowtmr(void)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>...</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>...</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp;&nbsp; pcb-&gt;rto =3D =
((pcb-&gt;sa &gt;&gt; 3)=20
+ pcb-&gt;sv) &lt;&lt; tcp_backoff[pcb-&gt;nrtx];</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>rto being an u16_t, will it not go zero =
by nrtx =3D=3D=20
4 at the latest ?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Peder</DIV>
<DIV><BR></DIV></FONT></BODY></HTML>

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