svn commit: r242261 - head/sys/netinet

[Andre Oppermann]

Author: andre
Date: Sun Oct 28 19:02:07 2012
New Revision: 242261
URL: http://svn.freebsd.org/changeset/base/242261

Log:
  For retransmits of SYN|ACK from the syncache use the slightly more
  aggressive special tcp_syn_backoff[] retransmit schedule instead of
  the normal tcp_backoff[] schedule for established connections.
  
  MFC after:	2 weeks

Modified:
  head/sys/netinet/tcp_syncache.c
  head/sys/netinet/tcp_timer.h

Modified: head/sys/netinet/tcp_syncache.c
==============================================================================
--- head/sys/netinet/tcp_syncache.c	Sun Oct 28 18:56:57 2012	(r242260)
+++ head/sys/netinet/tcp_syncache.c	Sun Oct 28 19:02:07 2012	(r242261)
@@ -391,7 +391,7 @@ static void
 syncache_timeout(struct syncache *sc, struct syncache_head *sch, int docallout)
 {
 	sc->sc_rxttime = ticks +
-		TCPTV_RTOBASE * (tcp_backoff[sc->sc_rxmits]);
+		TCPTV_RTOBASE * (tcp_syn_backoff[sc->sc_rxmits]);
 	sc->sc_rxmits++;
 	if (TSTMP_LT(sc->sc_rxttime, sch->sch_nextc)) {
 		sch->sch_nextc = sc->sc_rxttime;

Modified: head/sys/netinet/tcp_timer.h
==============================================================================
--- head/sys/netinet/tcp_timer.h	Sun Oct 28 18:56:57 2012	(r242260)
+++ head/sys/netinet/tcp_timer.h	Sun Oct 28 19:02:07 2012	(r242261)
@@ -170,6 +170,7 @@ extern int tcp_rexmit_slop;
 extern int tcp_msl;
 extern int tcp_ttl;			/* time to live for TCP segs */
 extern int tcp_backoff[];
+extern int tcp_syn_backoff[];
 
 extern int tcp_finwait2_timeout;
 extern int tcp_fast_finwait2_recycle;