define srtt to be assumed before connect; update comment

SCCS-vsn: sys/netinet/tcp_timer.h 6.5

diff --git a/usr/src/sys/netinet/tcp_timer.h b/usr/src/sys/netinet/tcp_timer.h
index baa5d30..bf4a3a6 100644 (file)
--- a/usr/src/sys/netinet/tcp_timer.h
+++ b/usr/src/sys/netinet/tcp_timer.h
@@ -3,7 +3,7 @@
  * All rights reserved.  The Berkeley software License Agreement
  * specifies the terms and conditions for redistribution.
  *
  * All rights reserved.  The Berkeley software License Agreement
  * specifies the terms and conditions for redistribution.
  *

- *     @(#)tcp_timer.h 6.4 (Berkeley) %G%
+ *     @(#)tcp_timer.h 6.5 (Berkeley) %G%

  */
 
 /*
  */
 
 /*


@@ -58,6 +58,8 @@
 #define        TCPTV_MSL       ( 15*PR_SLOWHZ)         /* max seg lifetime */
 #define        TCPTV_SRTTBASE  0                       /* base roundtrip time;
                                                   if 0, no idea yet */
 #define        TCPTV_MSL       ( 15*PR_SLOWHZ)         /* max seg lifetime */
 #define        TCPTV_SRTTBASE  0                       /* base roundtrip time;
                                                   if 0, no idea yet */

+#define        TCPTV_SRTTDFLT  (  5*PR_SLOWHZ)         /* assumed RTT if no info */
+

 #define        TCPTV_KEEP      ( 45*PR_SLOWHZ)         /* keep alive - 45 secs */
 #define        TCPTV_PERSMIN   (  5*PR_SLOWHZ)         /* retransmit persistance */
 
 #define        TCPTV_KEEP      ( 45*PR_SLOWHZ)         /* keep alive - 45 secs */
 #define        TCPTV_PERSMIN   (  5*PR_SLOWHZ)         /* retransmit persistance */
 


@@ -83,7 +85,7 @@ char *tcptimers[] =
  * each time a new value of tp->t_rtt is available.  The initial
  * retransmit timeout is then based on
  *    tp->t_timer[TCPT_REXMT] = tcp_beta * tp->t_srtt;
  * each time a new value of tp->t_rtt is available.  The initial
  * retransmit timeout is then based on
  *    tp->t_timer[TCPT_REXMT] = tcp_beta * tp->t_srtt;

- * limited, however to be at least TCPTV_REXMTLO and at most TCPTV_REXMTHI.
+ * limited, however to be at least TCPTV_MIN and at most TCPTV_MAX.

  */
 float  tcp_alpha, tcp_beta;
 
  */
 float  tcp_alpha, tcp_beta;