diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 8721a78..941df45 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -505,6 +505,7 @@ struct ip_vs_conn {
 						 * state transition triggerd
 						 * synchronization
 						 */
+	unsigned long		sync_endtime;	/* jiffies + sent_retries */
 
 	/* Control members */
 	struct ip_vs_conn       *control;       /* Master control connection */
@@ -876,6 +877,8 @@ struct netns_ipvs {
 	int			sysctl_expire_nodest_conn;
 	int			sysctl_expire_quiescent_template;
 	int			sysctl_sync_threshold[2];
+	unsigned int		sysctl_sync_refresh_period;
+	int			sysctl_sync_retries;
 	int			sysctl_nat_icmp_send;
 
 	/* ip_vs_lblc */
@@ -917,10 +920,13 @@ struct netns_ipvs {
 #define DEFAULT_SYNC_THRESHOLD	3
 #define DEFAULT_SYNC_PERIOD	50
 #define DEFAULT_SYNC_VER	1
+#define DEFAULT_SYNC_REFRESH_PERIOD	(0U * HZ)
+#define DEFAULT_SYNC_RETRIES		0
 #define IPVS_SYNC_WAKEUP_RATE	8
 #define IPVS_SYNC_QLEN_MAX	(IPVS_SYNC_WAKEUP_RATE * 4)
 #define IPVS_SYNC_SEND_DELAY	(HZ / 50)
 #define IPVS_SYNC_CHECK_PERIOD	HZ
+#define IPVS_SYNC_FLUSH_TIME	(HZ * 2)
 
 #ifdef CONFIG_SYSCTL
 
@@ -931,7 +937,17 @@ static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
 
 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
 {
-	return ipvs->sysctl_sync_threshold[1];
+	return ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]);
+}
+
+static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
+{
+	return ACCESS_ONCE(ipvs->sysctl_sync_refresh_period);
+}
+
+static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
+{
+	return ipvs->sysctl_sync_retries;
 }
 
 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
@@ -961,6 +977,16 @@ static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
 	return DEFAULT_SYNC_PERIOD;
 }
 
+static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
+{
+	return DEFAULT_SYNC_REFRESH_PERIOD;
+}
+
+static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
+{
+	return DEFAULT_SYNC_RETRIES & 3;
+}
+
 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
 {
 	return DEFAULT_SYNC_VER;
@@ -1248,7 +1274,7 @@ extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
 extern int start_sync_thread(struct net *net, int state, char *mcast_ifn,
 			     __u8 syncid);
 extern int stop_sync_thread(struct net *net, int state);
-extern void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp);
+extern void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts);
 
 
 /*
diff --git a/net/netfilter/ipvs/ip_vs_conn.c b/net/netfilter/ipvs/ip_vs_conn.c
index 9d237d7..46260fb 100644
--- a/net/netfilter/ipvs/ip_vs_conn.c
+++ b/net/netfilter/ipvs/ip_vs_conn.c
@@ -761,7 +761,8 @@ int ip_vs_check_template(struct ip_vs_conn *ct)
 static void ip_vs_conn_expire(unsigned long data)
 {
 	struct ip_vs_conn *cp = (struct ip_vs_conn *)data;
-	struct netns_ipvs *ipvs = net_ipvs(ip_vs_conn_net(cp));
+	struct net *net = ip_vs_conn_net(cp);
+	struct netns_ipvs *ipvs = net_ipvs(net);
 
 	cp->timeout = 60*HZ;
 
@@ -826,6 +827,9 @@ static void ip_vs_conn_expire(unsigned long data)
 		  atomic_read(&cp->refcnt)-1,
 		  atomic_read(&cp->n_control));
 
+	if (ipvs->sync_state & IP_VS_STATE_MASTER)
+		ip_vs_sync_conn(net, cp, sysctl_sync_threshold(ipvs));
+
 	ip_vs_conn_put(cp);
 }
 
@@ -899,6 +903,7 @@ ip_vs_conn_new(const struct ip_vs_conn_param *p,
 	/* Set its state and timeout */
 	cp->state = 0;
 	cp->timeout = 3*HZ;
+	cp->sync_endtime = jiffies & ~3UL;
 
 	/* Bind its packet transmitter */
 #ifdef CONFIG_IP_VS_IPV6
diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
index b5a5c73..7ce5819 100644
--- a/net/netfilter/ipvs/ip_vs_core.c
+++ b/net/netfilter/ipvs/ip_vs_core.c
@@ -1613,34 +1613,8 @@ ip_vs_in(unsigned int hooknum, struct sk_buff *skb, int af)
 	else
 		pkts = atomic_add_return(1, &cp->in_pkts);
 
-	if ((ipvs->sync_state & IP_VS_STATE_MASTER) &&
-	    cp->protocol == IPPROTO_SCTP) {
-		if ((cp->state == IP_VS_SCTP_S_ESTABLISHED &&
-			(pkts % sysctl_sync_period(ipvs)
-			 == sysctl_sync_threshold(ipvs))) ||
-				(cp->old_state != cp->state &&
-				 ((cp->state == IP_VS_SCTP_S_CLOSED) ||
-				  (cp->state == IP_VS_SCTP_S_SHUT_ACK_CLI) ||
-				  (cp->state == IP_VS_SCTP_S_SHUT_ACK_SER)))) {
-			ip_vs_sync_conn(net, cp);
-			goto out;
-		}
-	}
-
-	/* Keep this block last: TCP and others with pp->num_states <= 1 */
-	else if ((ipvs->sync_state & IP_VS_STATE_MASTER) &&
-	    (((cp->protocol != IPPROTO_TCP ||
-	       cp->state == IP_VS_TCP_S_ESTABLISHED) &&
-	      (pkts % sysctl_sync_period(ipvs)
-	       == sysctl_sync_threshold(ipvs))) ||
-	     ((cp->protocol == IPPROTO_TCP) && (cp->old_state != cp->state) &&
-	      ((cp->state == IP_VS_TCP_S_FIN_WAIT) ||
-	       (cp->state == IP_VS_TCP_S_CLOSE) ||
-	       (cp->state == IP_VS_TCP_S_CLOSE_WAIT) ||
-	       (cp->state == IP_VS_TCP_S_TIME_WAIT)))))
-		ip_vs_sync_conn(net, cp);
-out:
-	cp->old_state = cp->state;
+	if (ipvs->sync_state & IP_VS_STATE_MASTER)
+		ip_vs_sync_conn(net, cp, pkts);
 
 	ip_vs_conn_put(cp);
 	return ret;
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 854e9a6..83bdbbc 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -1599,6 +1599,10 @@ static int ip_vs_zero_all(struct net *net)
 }
 
 #ifdef CONFIG_SYSCTL
+
+static int zero;
+static int three = 3;
+
 static int
 proc_do_defense_mode(ctl_table *table, int write,
 		     void __user *buffer, size_t *lenp, loff_t *ppos)
@@ -1632,7 +1636,8 @@ proc_do_sync_threshold(ctl_table *table, int write,
 	memcpy(val, valp, sizeof(val));
 
 	rc = proc_dointvec(table, write, buffer, lenp, ppos);
-	if (write && (valp[0] < 0 || valp[1] < 0 || valp[0] >= valp[1])) {
+	if (write && (valp[0] < 0 || valp[1] < 0 ||
+	    (valp[0] >= valp[1] && valp[1]))) {
 		/* Restore the correct value */
 		memcpy(valp, val, sizeof(val));
 	}
@@ -1755,6 +1760,20 @@ static struct ctl_table vs_vars[] = {
 		.proc_handler	= proc_do_sync_threshold,
 	},
 	{
+		.procname	= "sync_refresh_period",
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_jiffies,
+	},
+	{
+		.procname	= "sync_retries",
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &zero,
+		.extra2		= &three,
+	},
+	{
 		.procname	= "nat_icmp_send",
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
@@ -3685,6 +3704,10 @@ int __net_init ip_vs_control_net_init_sysctl(struct net *net)
 	ipvs->sysctl_sync_threshold[1] = DEFAULT_SYNC_PERIOD;
 	tbl[idx].data = &ipvs->sysctl_sync_threshold;
 	tbl[idx++].maxlen = sizeof(ipvs->sysctl_sync_threshold);
+	ipvs->sysctl_sync_refresh_period = DEFAULT_SYNC_REFRESH_PERIOD;
+	tbl[idx++].data = &ipvs->sysctl_sync_refresh_period;
+	ipvs->sysctl_sync_retries = clamp_t(int, DEFAULT_SYNC_RETRIES, 0, 3);
+	tbl[idx++].data = &ipvs->sysctl_sync_retries;
 	tbl[idx++].data = &ipvs->sysctl_nat_icmp_send;
 
 
diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c
index eafc1d2..4aa9290 100644
--- a/net/netfilter/ipvs/ip_vs_sync.c
+++ b/net/netfilter/ipvs/ip_vs_sync.c
@@ -451,11 +451,94 @@ ip_vs_sync_buff_create_v0(struct netns_ipvs *ipvs)
 	return sb;
 }
 
+/* Check if conn should be synced.
+ * pkts: conn packets, use sysctl_sync_threshold to avoid packet check
+ * - (1) sync_refresh_period: reduce sync rate. Additionally, retry
+ *	sync_retries times with period of sync_refresh_period/8
+ * - (2) if both sync_refresh_period and sync_period are 0 send sync only
+ *	for state changes or only once when pkts matches sync_threshold
+ * - (3) templates: rate can be reduced only with sync_refresh_period or
+ *	with (2)
+ */
+static int ip_vs_sync_conn_needed(struct netns_ipvs *ipvs,
+				  struct ip_vs_conn *cp, int pkts)
+{
+	unsigned long orig = ACCESS_ONCE(cp->sync_endtime);
+	unsigned long now = jiffies;
+	unsigned long n = (now + cp->timeout) & ~3UL;
+	unsigned int sync_refresh_period;
+	int sync_period;
+	int force;
+
+	/* Check if we sync in current state */
+	if (unlikely(cp->flags & IP_VS_CONN_F_TEMPLATE))
+		force = 0;
+	else if (likely(cp->protocol == IPPROTO_TCP)) {
+		if (!((1 << cp->state) &
+		      ((1 << IP_VS_TCP_S_ESTABLISHED) |
+		       (1 << IP_VS_TCP_S_FIN_WAIT) |
+		       (1 << IP_VS_TCP_S_CLOSE) |
+		       (1 << IP_VS_TCP_S_CLOSE_WAIT) |
+		       (1 << IP_VS_TCP_S_TIME_WAIT))))
+			return 0;
+		force = cp->state != cp->old_state;
+		if (force && cp->state != IP_VS_TCP_S_ESTABLISHED)
+			goto set;
+	} else if (unlikely(cp->protocol == IPPROTO_SCTP)) {
+		if (!((1 << cp->state) &
+		      ((1 << IP_VS_SCTP_S_ESTABLISHED) |
+		       (1 << IP_VS_SCTP_S_CLOSED) |
+		       (1 << IP_VS_SCTP_S_SHUT_ACK_CLI) |
+		       (1 << IP_VS_SCTP_S_SHUT_ACK_SER))))
+			return 0;
+		force = cp->state != cp->old_state;
+		if (force && cp->state != IP_VS_SCTP_S_ESTABLISHED)
+			goto set;
+	} else {
+		/* UDP or another protocol with single state */
+		force = 0;
+	}
+
+	sync_refresh_period = sysctl_sync_refresh_period(ipvs);
+	if (sync_refresh_period > 0) {
+		long diff = n - orig;
+		long min_diff = max(cp->timeout >> 1, 10UL * HZ);
+
+		/* Avoid sync if difference is below sync_refresh_period
+		 * and below the half timeout.
+		 */
+		if (abs(diff) < min_t(long, sync_refresh_period, min_diff)) {
+			int retries = orig & 3;
+
+			if (retries >= sysctl_sync_retries(ipvs))
+				return 0;
+			if (time_before(now, orig - cp->timeout +
+					(sync_refresh_period >> 3)))
+				return 0;
+			n |= retries + 1;
+		}
+	}
+	sync_period = sysctl_sync_period(ipvs);
+	if (sync_period > 0) {
+		if (!(cp->flags & IP_VS_CONN_F_TEMPLATE) &&
+		    pkts % sync_period != sysctl_sync_threshold(ipvs))
+			return 0;
+	} else if (sync_refresh_period <= 0 &&
+		   pkts != sysctl_sync_threshold(ipvs))
+		return 0;
+
+set:
+	cp->old_state = cp->state;
+	n = cmpxchg(&cp->sync_endtime, orig, n);
+	return n == orig || force;
+}
+
 /*
  *      Version 0 , could be switched in by sys_ctl.
  *      Add an ip_vs_conn information into the current sync_buff.
  */
-void ip_vs_sync_conn_v0(struct net *net, struct ip_vs_conn *cp)
+static void ip_vs_sync_conn_v0(struct net *net, struct ip_vs_conn *cp,
+			       int pkts)
 {
 	struct netns_ipvs *ipvs = net_ipvs(net);
 	struct ip_vs_sync_mesg_v0 *m;
@@ -468,6 +551,9 @@ void ip_vs_sync_conn_v0(struct net *net, struct ip_vs_conn *cp)
 	if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
 		return;
 
+	if (!ip_vs_sync_conn_needed(ipvs, cp, pkts))
+		return;
+
 	spin_lock(&ipvs->sync_buff_lock);
 	if (!ipvs->sync_buff) {
 		ipvs->sync_buff =
@@ -513,8 +599,14 @@ void ip_vs_sync_conn_v0(struct net *net, struct ip_vs_conn *cp)
 	spin_unlock(&ipvs->sync_buff_lock);
 
 	/* synchronize its controller if it has */
-	if (cp->control)
-		ip_vs_sync_conn(net, cp->control);
+	cp = cp->control;
+	if (cp) {
+		if (cp->flags & IP_VS_CONN_F_TEMPLATE)
+			pkts = atomic_add_return(1, &cp->in_pkts);
+		else
+			pkts = sysctl_sync_threshold(ipvs);
+		ip_vs_sync_conn(net, cp->control, pkts);
+	}
 }
 
 /*
@@ -522,7 +614,7 @@ void ip_vs_sync_conn_v0(struct net *net, struct ip_vs_conn *cp)
  *      Called by ip_vs_in.
  *      Sending Version 1 messages
  */
-void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp)
+void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts)
 {
 	struct netns_ipvs *ipvs = net_ipvs(net);
 	struct ip_vs_sync_mesg *m;
@@ -532,13 +624,16 @@ void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp)
 
 	/* Handle old version of the protocol */
 	if (sysctl_sync_ver(ipvs) == 0) {
-		ip_vs_sync_conn_v0(net, cp);
+		ip_vs_sync_conn_v0(net, cp, pkts);
 		return;
 	}
 	/* Do not sync ONE PACKET */
 	if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
 		goto control;
 sloop:
+	if (!ip_vs_sync_conn_needed(ipvs, cp, pkts))
+		goto control;
+
 	/* Sanity checks */
 	pe_name_len = 0;
 	if (cp->pe_data_len) {
@@ -653,16 +748,10 @@ control:
 	cp = cp->control;
 	if (!cp)
 		return;
-	/*
-	 * Reduce sync rate for templates
-	 * i.e only increment in_pkts for Templates.
-	 */
-	if (cp->flags & IP_VS_CONN_F_TEMPLATE) {
-		int pkts = atomic_add_return(1, &cp->in_pkts);
-
-		if (pkts % sysctl_sync_period(ipvs) != 1)
-			return;
-	}
+	if (cp->flags & IP_VS_CONN_F_TEMPLATE)
+		pkts = atomic_add_return(1, &cp->in_pkts);
+	else
+		pkts = sysctl_sync_threshold(ipvs);
 	goto sloop;
 }
 
@@ -1494,7 +1583,7 @@ next_sync_buff(struct netns_ipvs *ipvs)
 	if (sb)
 		return sb;
 	/* Do not delay entries in buffer for more than 2 seconds */
-	return get_curr_sync_buff(ipvs, 2 * HZ);
+	return get_curr_sync_buff(ipvs, IPVS_SYNC_FLUSH_TIME);
 }
 
 static int sync_thread_master(void *data)