diff --git a/src/sf_global.c b/src/sf_global.c
index f31bc3c..d69c770 100644
--- a/src/sf_global.c
+++ b/src/sf_global.c
@@ -47,8 +47,9 @@ SFGlobalVariables g_sf_global_vars = {
 
 SFContext g_sf_context = {{'\0'}, NULL, 0,
     {{true, fc_comm_type_sock}, {false, fc_comm_type_rdma}},
-    1, DEFAULT_WORK_THREADS, {'\0'}, {'\0'}, 0, true, true, NULL,
-    NULL, NULL, NULL, NULL, sf_task_finish_clean_up, NULL
+    1, DEFAULT_WORK_THREADS, {'\0'}, {'\0'}, 0, true, true,
+    {false, 0, 0}, NULL, NULL, NULL, NULL, NULL,
+    sf_task_finish_clean_up, NULL
 };
 
 static inline void set_config_str_value(const char *value,
diff --git a/src/sf_nio.c b/src/sf_nio.c
index 6da8a9d..f9bf211 100644
--- a/src/sf_nio.c
+++ b/src/sf_nio.c
@@ -507,7 +507,8 @@ static inline int check_task(struct fast_task_info *task,
             return -1;
         }
     } else {
-        return EAGAIN;
+        //TODO: for streaming should return EAGAIN
+        return 0;
     }
 }
 
@@ -713,6 +714,114 @@ ssize_t sf_socket_recv_data(struct fast_task_info *task, SFCommAction *action)
     return bytes;
 }
 
+static int calc_iops_and_trigger_polling(struct fast_task_info *task)
+{
+    int time_distance;
+    int result = 0;
+
+    time_distance = g_current_time - task->polling.last_calc_time;
+    if (time_distance > 0) {
+        if ((task->req_count - task->polling.last_req_count) /
+                time_distance >= SF_CTX->smart_polling.switch_on_iops)
+        {
+            task->polling.continuous_count++;
+            if (task->polling.continuous_count >= SF_CTX->
+                    smart_polling.switch_on_count)
+            {
+                task->polling.continuous_count = 0;
+                task->polling.in_queue = true;
+                result = ioevent_detach(&task->thread_data->
+                        ev_puller, task->event.fd);
+                fc_list_add_tail(&task->polling.dlink,
+                        &task->thread_data->polling_queue);
+            }
+        } else {
+            if (task->polling.continuous_count > 0) {
+                task->polling.continuous_count = 0;
+            }
+        }
+
+        logInfo("====== trigger_polling iops: %"PRId64, (task->req_count -
+                    task->polling.last_req_count) / time_distance);
+
+        task->polling.last_calc_time = g_current_time;
+        task->polling.last_req_count = task->req_count;
+    }
+
+    return result;
+}
+
+static int calc_iops_and_remove_polling(struct fast_task_info *task)
+{
+    int time_distance;
+    int result = 0;
+
+    time_distance = g_current_time - task->polling.last_calc_time;
+    if (time_distance > 0) {
+        if ((task->req_count - task->polling.last_req_count) /
+                time_distance < SF_CTX->smart_polling.switch_on_iops)
+        {
+            task->polling.continuous_count++;
+            if (task->polling.continuous_count >= SF_CTX->
+                    smart_polling.switch_on_count)
+            {
+                task->polling.continuous_count = 0;
+                task->polling.in_queue = false;
+                fc_list_del_init(&task->polling.dlink);
+                result = sf_ioevent_add(task, (IOEventCallback)
+                        sf_client_sock_read, task->network_timeout);
+            }
+        } else {
+            if (task->polling.continuous_count > 0) {
+                task->polling.continuous_count = 0;
+            }
+        }
+
+        logInfo("@@@@@ remove_polling iops: %"PRId64, (task->req_count -
+                    task->polling.last_req_count) / time_distance);
+
+        task->polling.last_calc_time = g_current_time;
+        task->polling.last_req_count = task->req_count;
+    }
+
+    return result;
+}
+
+int sf_rdma_busy_polling_callback(struct nio_thread_data *thread_data)
+{
+    struct fast_task_info *task;
+    struct fast_task_info *tmp;
+    int bytes;
+    SFCommAction action;
+
+    fc_list_for_each_entry_safe(task, tmp, &thread_data->
+            polling_queue, polling.dlink)
+    {
+        if ((bytes=task->handler->recv_data(task, &action)) < 0) {
+            ioevent_add_to_deleted_list(task);
+            continue;
+        }
+
+        if (action == sf_comm_action_finish) {
+            fast_timer_modify(&task->thread_data->timer,
+                    &task->event.timer, g_current_time +
+                    task->network_timeout);
+
+            task->req_count++;
+            task->nio_stages.current = SF_NIO_STAGE_SEND;
+            if (SF_CTX->deal_task(task, SF_NIO_STAGE_SEND) < 0) {  //fatal error
+                ioevent_add_to_deleted_list(task);
+            }
+        } else {
+            if (calc_iops_and_remove_polling(task) != 0) {
+                ioevent_add_to_deleted_list(task);
+            }
+        }
+    }
+
+    return 0;
+}
+
 int sf_client_sock_read(int sock, short event, void *arg)
 {
     int result;
@@ -779,6 +888,14 @@ int sf_client_sock_read(int sock, short event, void *arg)
                 ioevent_add_to_deleted_list(task);
                 return -1;
             }
+
+            if (SF_CTX->smart_polling.enabled) {
+                if (calc_iops_and_trigger_polling(task) != 0) {
+                    ioevent_add_to_deleted_list(task);
+                    return -1;
+                }
+            }
+
             break;
         } else if (action == sf_comm_action_break) {
             break;
diff --git a/src/sf_nio.h b/src/sf_nio.h
index 3ce0438..a64a406 100644
--- a/src/sf_nio.h
+++ b/src/sf_nio.h
@@ -125,6 +125,8 @@ int sf_socket_connect_server_done(struct fast_task_info *task);
 ssize_t sf_socket_send_data(struct fast_task_info *task, SFCommAction *action);
 ssize_t sf_socket_recv_data(struct fast_task_info *task, SFCommAction *action);
 
+int sf_rdma_busy_polling_callback(struct nio_thread_data *thread_data);
+
 static inline int sf_nio_forward_request(struct fast_task_info *task,
         const int new_thread_index)
 {
diff --git a/src/sf_service.c b/src/sf_service.c
index da91311..975c2c4 100644
--- a/src/sf_service.c
+++ b/src/sf_service.c
@@ -187,6 +187,14 @@ int sf_service_init_ex2(SFContext *sf_context, const char *name,
     for (thread_data=sf_context->thread_data,thread_ctx=thread_contexts;
             thread_data<data_end; thread_data++,thread_ctx++)
     {
+        FC_INIT_LIST_HEAD(&thread_data->polling_queue);
+        if (sf_context->smart_polling.enabled) {
+            thread_data->busy_polling_callback =
+                sf_rdma_busy_polling_callback;
+        } else {
+            thread_data->busy_polling_callback = NULL;
+        }
+
         thread_data->thread_loop_callback = thread_loop_callback;
         if (alloc_thread_extra_data_callback != NULL) {
             thread_data->arg = alloc_thread_extra_data_callback(
diff --git a/src/sf_service.h b/src/sf_service.h
index 912a864..de3328b 100644
--- a/src/sf_service.h
+++ b/src/sf_service.h
@@ -76,6 +76,15 @@ void sf_service_set_thread_loop_callback_ex(SFContext *sf_context,
 #define sf_service_set_thread_loop_callback(thread_loop_callback) \
     sf_service_set_thread_loop_callback_ex(&g_sf_context, thread_loop_callback)
 
+static inline void sf_service_set_smart_polling_ex(SFContext *sf_context,
+        const FCSmartPollingConfig *smart_polling)
+{
+    sf_context->smart_polling = *smart_polling;
+}
+
+#define sf_service_set_smart_polling(smart_polling) \
+    sf_service_set_smart_polling_ex(&g_sf_context, smart_polling)
+
 int sf_setup_signal_handler();
 
 int sf_startup_schedule(pthread_t *schedule_tid);
diff --git a/src/sf_types.h b/src/sf_types.h
index 303941a..0253b3f 100644
--- a/src/sf_types.h
+++ b/src/sf_types.h
@@ -140,6 +140,7 @@ typedef struct sf_context {
     int header_size;
     bool remove_from_ready_list;
     bool realloc_task_buffer;
+    FCSmartPollingConfig smart_polling;
     sf_deal_task_func deal_task;
     sf_set_body_length_callback set_body_length;
     sf_alloc_recv_buffer_callback alloc_recv_buffer;