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Comment where the Restart Window is computed, and in the non-CWM case,

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make sure it never _increases_ cwnd.
This commit is contained in:
thorpej 1998-07-17 22:52:01 +00:00
parent 1c4ff0a086
commit 830879a809
1 changed files with 12 additions and 3 deletions
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15
sys/netinet/tcp_output.c
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@ -1,4 +1,4 @@
/* $NetBSD: tcp_output.c,v 1.40 1998/07/07 00:04:59 sommerfe Exp $ */
/* $NetBSD: tcp_output.c,v 1.41 1998/07/17 22:52:01 thorpej Exp $ */
/*-
* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
@ -183,6 +183,15 @@ tcp_output(tp)
idle = (tp->snd_max == tp->snd_una);
/*
* Restart Window computation. From draft-floyd-incr-init-win-03:
*
* Optionally, a TCP MAY set the restart window to the
* minimum of the value used for the initial window and
* the current value of cwnd (in other words, using a
* larger value for the restart window should never increase
* the size of cwnd).
*/
if (tcp_cwm) {
/*
* Hughes/Touch/Heidemann Congestion Window Monitoring.
@ -202,8 +211,8 @@ tcp_output(tp)
* expected to clock out any data we send --
* slow start to get ack "clock" running again.
*/
tp->snd_cwnd = TCP_INITIAL_WINDOW(tcp_init_win,
txsegsize);
tp->snd_cwnd = min(tp->snd_cwnd,
TCP_INITIAL_WINDOW(tcp_init_win, txsegsize));
}
}