diff options
| author | jlemon <jlemon@FreeBSD.org> | 2001-02-26 21:33:55 +0000 |
|---|---|---|
| committer | jlemon <jlemon@FreeBSD.org> | 2001-02-26 21:33:55 +0000 |
| commit | 825b685ed9a5971ca52d4f4524a383e84b332e73 (patch) | |
| tree | 45b478a07834cf8419a77466fa0474f1ee3ca3a1 /sys/netinet/tcp_timer.c | |
| parent | 8260da124e28847c02e67eab46bceb9d967f5c75 (diff) | |
| download | FreeBSD-src-825b685ed9a5971ca52d4f4524a383e84b332e73.zip FreeBSD-src-825b685ed9a5971ca52d4f4524a383e84b332e73.tar.gz | |
Use more aggressive retransmit timeouts for the initial SYN packet.
As we currently drop the connection after 4 retransmits + 2 ICMP errors,
this allows initial connection attempts to be dropped much faster.
Diffstat (limited to 'sys/netinet/tcp_timer.c')
| -rw-r--r-- | sys/netinet/tcp_timer.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/sys/netinet/tcp_timer.c b/sys/netinet/tcp_timer.c index 18686aa..0947295 100644 --- a/sys/netinet/tcp_timer.c +++ b/sys/netinet/tcp_timer.c @@ -153,6 +153,9 @@ tcp_canceltimers(tp) callout_stop(tp->tt_rexmt); } +int tcp_syn_backoff[TCP_MAXRXTSHIFT + 1] = + { 1, 1, 1, 1, 1, 2, 4, 8, 16, 32, 64, 64, 64 }; + int tcp_backoff[TCP_MAXRXTSHIFT + 1] = { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 }; @@ -393,7 +396,10 @@ tcp_timer_rexmt(xtp) tp->t_badrxtwin = ticks + (tp->t_srtt >> (TCP_RTT_SHIFT + 1)); } tcpstat.tcps_rexmttimeo++; - rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift]; + if (tp->t_state == TCPS_SYN_SENT) + rexmt = TCP_REXMTVAL(tp) * tcp_syn_backoff[tp->t_rxtshift]; + else + rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift]; TCPT_RANGESET(tp->t_rxtcur, rexmt, tp->t_rttmin, TCPTV_REXMTMAX); /* |
