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Adjust the initial default CWND upon connection establishment to the

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new and increased values specified by RFC5681 Section 3.1.

The even larger initial CWND per RFC3390, if enabled, is not affected.

MFC after:	2 weeks
This commit is contained in:
Andre Oppermann 2012-10-28 17:16:09 +00:00
parent b4380da796
commit 22efabd40c
1 changed files with 9 additions and 2 deletions
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11
sys/netinet/tcp_input.c
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@ -351,8 +351,15 @@ cc_conn_init(struct tcpcb *tp)
if (V_tcp_do_rfc3390)
tp->snd_cwnd = min(4 * tp->t_maxseg,
max(2 * tp->t_maxseg, 4380));
else
tp->snd_cwnd = tp->t_maxseg;
else {
/* Per RFC5681 Section 3.1 */
if (tp->t_maxseg > 2190)
tp->snd_cwnd = 2 * tp->t_maxseg;
else if (tp->t_maxseg > 1095)
tp->snd_cwnd = 3 * tp->t_maxseg;
else
tp->snd_cwnd = 4 * tp->t_maxseg;
}
if (CC_ALGO(tp)->conn_init != NULL)
CC_ALGO(tp)->conn_init(tp->ccv);