Author: andre
Date: Sun Oct 28 18:56:57 2012
New Revision: 242260
URL: http://svn.freebsd.org/changeset/base/242260
Log:
When retransmitting SYN in TCPS_SYN_SENT state use TCPTV_RTOBASE,
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
Modified:
head/sys/netinet/tcp_timer.c
Modified: head/sys/netinet/tcp_timer.c
==============================================================================
--- head/sys/netinet/tcp_timer.c Sun Oct 28 18:53:28 2012
(r242259)
+++ head/sys/netinet/tcp_timer.c Sun Oct 28 18:56:57 2012
(r242260)
@@ -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,
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