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When retransmitting SYN in TCPS_SYN_SENT state use TCPTV_RTOBASE,

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the default retransmit timeout, as base to calculate the backoff
time until next try instead of the TCP_REXMTVAL() macro which only
works correctly when we already have measured an actual RTT+RTTVAR.

Before it would cause the first retransmit at RTOBASE, the next
four at the same time (!) about 200ms later, and then another one
again RTOBASE later.

MFC after:	2 weeks
This commit is contained in:
Andre Oppermann 2012-10-28 18:56:57 +00:00
parent f1988d463c
commit f4748ef5fb
1 changed files with 1 additions and 1 deletions
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2
sys/netinet/tcp_timer.c
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@ -572,7 +572,7 @@ tcp_timer_rexmt(void * xtp)
tp->t_flags &= ~TF_PREVVALID;
TCPSTAT_INC(tcps_rexmttimeo);
if (tp->t_state == TCPS_SYN_SENT)
rexmt = TCP_REXMTVAL(tp) * tcp_syn_backoff[tp->t_rxtshift];
rexmt = TCPTV_RTOBASE * tcp_syn_backoff[tp->t_rxtshift];
else
rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift];
TCPT_RANGESET(tp->t_rxtcur, rexmt,