diff --git a/pkg/proxy/iptables/proxier.go b/pkg/proxy/iptables/proxier.go
index f0ab86fa203..f8ee5b30ab5 100644
--- a/pkg/proxy/iptables/proxier.go
+++ b/pkg/proxy/iptables/proxier.go
@@ -436,7 +436,7 @@ func CleanupLeftovers(ipt utiliptables.Interface) (encounteredError bool) {
 func (proxier *Proxier) Sync() {
 	proxier.mu.Lock()
 	defer proxier.mu.Unlock()
-	proxier.syncProxyRules()
+	proxier.syncProxyRules(syncReasonForce)
 }
 
 // SyncLoop runs periodic work.  This is expected to run as a goroutine or as the main loop of the app.  It does not return.
@@ -554,7 +554,7 @@ func (proxier *Proxier) OnServiceUpdate(allServices []*api.Service) {
 
 	if len(newServiceMap) != len(proxier.serviceMap) || !reflect.DeepEqual(newServiceMap, proxier.serviceMap) {
 		proxier.serviceMap = newServiceMap
-		proxier.syncProxyRules()
+		proxier.syncProxyRules(syncReasonServices)
 	} else {
 		glog.V(4).Infof("Skipping proxy iptables rule sync on service update because nothing changed")
 	}
@@ -575,7 +575,7 @@ func (proxier *Proxier) OnEndpointsUpdate(allEndpoints []*api.Endpoints) {
 	newMap, staleConnections := buildNewEndpointsMap(proxier.allEndpoints, proxier.endpointsMap, proxier.hostname, proxier.healthChecker)
 	if len(newMap) != len(proxier.endpointsMap) || !reflect.DeepEqual(newMap, proxier.endpointsMap) {
 		proxier.endpointsMap = newMap
-		proxier.syncProxyRules()
+		proxier.syncProxyRules(syncReasonEndpoints)
 	} else {
 		glog.V(4).Infof("Skipping proxy iptables rule sync on endpoint update because nothing changed")
 	}
@@ -757,16 +757,22 @@ func (proxier *Proxier) deleteEndpointConnections(connectionMap map[endpointServ
 	}
 }
 
+type syncReason string
+
+const syncReasonServices syncReason = "ServicesUpdate"
+const syncReasonEndpoints syncReason = "EndpointsUpdate"
+const syncReasonForce syncReason = "Force"
+
 // This is where all of the iptables-save/restore calls happen.
 // The only other iptables rules are those that are setup in iptablesInit()
 // assumes proxier.mu is held
-func (proxier *Proxier) syncProxyRules() {
+func (proxier *Proxier) syncProxyRules(reason syncReason) {
 	if proxier.throttle != nil {
 		proxier.throttle.Accept()
 	}
 	start := time.Now()
 	defer func() {
-		glog.V(4).Infof("syncProxyRules took %v", time.Since(start))
+		glog.V(4).Infof("syncProxyRules(%s) took %v", reason, time.Since(start))
 	}()
 	// don't sync rules till we've received services and endpoints
 	if proxier.allEndpoints == nil || proxier.allServices == nil {
diff --git a/pkg/proxy/iptables/proxier_test.go b/pkg/proxy/iptables/proxier_test.go
index e3136d79005..016c7dba445 100644
--- a/pkg/proxy/iptables/proxier_test.go
+++ b/pkg/proxy/iptables/proxier_test.go
@@ -546,7 +546,7 @@ func TestClusterIPReject(t *testing.T) {
 
 	svc := proxy.ServicePortName{NamespacedName: types.NamespacedName{Namespace: "ns1", Name: svcName}, Port: "p80"}
 	fp.serviceMap[svc] = newFakeServiceInfo(svc, svcIP, 80, api.ProtocolTCP, false)
-	fp.syncProxyRules()
+	fp.syncProxyRules(syncReasonForce)
 
 	svcChain := string(servicePortChainName(svc, strings.ToLower(string(api.ProtocolTCP))))
 	svcRules := ipt.GetRules(svcChain)
@@ -638,7 +638,7 @@ func TestLoadBalancer(t *testing.T) {
 		}),
 	}
 
-	fp.syncProxyRules()
+	fp.syncProxyRules(syncReasonForce)
 
 	proto := strings.ToLower(string(api.ProtocolTCP))
 	fwChain := string(serviceFirewallChainName(svc, proto))
@@ -683,7 +683,7 @@ func TestNodePort(t *testing.T) {
 		}),
 	}
 
-	fp.syncProxyRules()
+	fp.syncProxyRules(syncReasonForce)
 
 	proto := strings.ToLower(string(api.ProtocolTCP))
 	svcChain := string(servicePortChainName(svc, strings.ToLower(proto)))
@@ -705,7 +705,7 @@ func TestNodePortReject(t *testing.T) {
 	svcInfo.nodePort = 3001
 	fp.serviceMap[svc] = svcInfo
 
-	fp.syncProxyRules()
+	fp.syncProxyRules(syncReasonForce)
 
 	kubeSvcRules := ipt.GetRules(string(kubeServicesChain))
 	if !hasJump(kubeSvcRules, iptablestest.Reject, svcIP.String(), 3001) {