diff --git a/neutron/agent/l3/agent.py b/neutron/agent/l3/agent.py
index 0091679a3bf..415a36140fe 100644
--- a/neutron/agent/l3/agent.py
+++ b/neutron/agent/l3/agent.py
@@ -268,7 +268,8 @@ class L3NATAgent(ha.AgentMixin,
             self.metadata_driver)
 
         # L3 agent router processing green pool
-        self._pool = eventlet.GreenPool(size=ROUTER_PROCESS_GREENLET_MIN)
+        self._pool_size = ROUTER_PROCESS_GREENLET_MIN
+        self._pool = eventlet.GreenPool(size=self._pool_size)
         self._queue = queue.ResourceProcessingQueue()
         super(L3NATAgent, self).__init__(host=self.conf.host)
 
@@ -420,12 +421,15 @@ class L3NATAgent(ha.AgentMixin,
 
     @lockutils.synchronized('resize_greenpool')
     def _resize_process_pool(self):
-        self._pool_size = max([ROUTER_PROCESS_GREENLET_MIN,
-                               min([ROUTER_PROCESS_GREENLET_MAX,
-                                    len(self.router_info)])])
+        pool_size = max([ROUTER_PROCESS_GREENLET_MIN,
+                         min([ROUTER_PROCESS_GREENLET_MAX,
+                              len(self.router_info)])])
+        if pool_size == self._pool_size:
+            return
         LOG.info("Resizing router processing queue green pool size to: %d",
-                 self._pool_size)
-        self._pool.resize(self._pool_size)
+                 pool_size)
+        self._pool.resize(pool_size)
+        self._pool_size = pool_size
 
     def _router_added(self, router_id, router):
         ri = self._create_router(router_id, router)