Index: sys/netinet/tcp_output.c
===================================================================
--- sys/netinet/tcp_output.c
+++ sys/netinet/tcp_output.c
@@ -1625,7 +1625,7 @@
 	 * Start/restart persistance timer.
 	 */
 	TCPT_RANGESET(tt, t * tcp_backoff[tp->t_rxtshift],
-		      TCPTV_PERSMIN, TCPTV_PERSMAX);
+		      tcp_persmin, tcp_persmax);
 	tcp_timer_activate(tp, TT_PERSIST, tt);
 	if (tp->t_rxtshift < TCP_MAXRXTSHIFT)
 		tp->t_rxtshift++;
Index: sys/netinet/tcp_subr.c
===================================================================
--- sys/netinet/tcp_subr.c
+++ sys/netinet/tcp_subr.c
@@ -672,6 +672,8 @@
 	tcp_rexmit_min = TCPTV_MIN;
 	if (tcp_rexmit_min < 1)
 		tcp_rexmit_min = 1;
+	tcp_persmin = TCPTV_PERSMIN;
+	tcp_persmax = TCPTV_PERSMAX;
 	tcp_rexmit_slop = TCPTV_CPU_VAR;
 	tcp_finwait2_timeout = TCPTV_FINWAIT2_TIMEOUT;
 	tcp_tcbhashsize = hashsize;
Index: sys/netinet/tcp_timer.h
===================================================================
--- sys/netinet/tcp_timer.h
+++ sys/netinet/tcp_timer.h
@@ -77,7 +77,7 @@
 						   if 0, no idea yet */
 #define	TCPTV_RTOBASE	(  3*hz)		/* assumed RTO if no info */
 
-#define	TCPTV_PERSMIN	(  5*hz)		/* retransmit persistence */
+#define	TCPTV_PERSMIN	(  5*hz)		/* minimum persist interval */
 #define	TCPTV_PERSMAX	( 60*hz)		/* maximum persist interval */
 
 #define	TCPTV_KEEP_INIT	( 75*hz)		/* initial connect keepalive */
@@ -173,6 +173,8 @@
 #define	TP_KEEPCNT(tp)	((tp)->t_keepcnt ? (tp)->t_keepcnt : tcp_keepcnt)
 #define	TP_MAXIDLE(tp)	(TP_KEEPCNT(tp) * TP_KEEPINTVL(tp))
 
+extern int tcp_persmin;			/* minimum persist interval */
+extern int tcp_persmax;			/* maximum persist interval */
 extern int tcp_keepinit;		/* time to establish connection */
 extern int tcp_keepidle;		/* time before keepalive probes begin */
 extern int tcp_keepintvl;		/* time between keepalive probes */
Index: sys/netinet/tcp_timer.c
===================================================================
--- sys/netinet/tcp_timer.c
+++ sys/netinet/tcp_timer.c
@@ -76,6 +76,14 @@
 #include <netinet/tcp_debug.h>
 #endif
 
+int    tcp_persmin;
+SYSCTL_PROC(_net_inet_tcp, OID_AUTO, persmin, CTLTYPE_INT|CTLFLAG_RW,
+    &tcp_persmin, 0, sysctl_msec_to_ticks, "I", "minimum persistence interval");
+
+int    tcp_persmax;
+SYSCTL_PROC(_net_inet_tcp, OID_AUTO, persmax, CTLTYPE_INT|CTLFLAG_RW,
+    &tcp_persmax, 0, sysctl_msec_to_ticks, "I", "maximum persistence interval");
+
 int	tcp_keepinit;
 SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPINIT, keepinit, CTLTYPE_INT|CTLFLAG_RW,
     &tcp_keepinit, 0, sysctl_msec_to_ticks, "I", "time to establish connection");