a few optimizations

src/switch_core_sqldb.c

@@ -201,9 +201,11 @@ SWITCH_DECLARE(switch_status_t) _switch_core_db_handle(switch_cache_db_handle_t
 		r = _switch_cache_db_get_db_handle(dbh, SCDB_TYPE_CORE_DB, &options, file, func, line);
 	}
 
+	/* I *think* we can do without this now, if not let me know 
 	if (r == SWITCH_STATUS_SUCCESS && !(*dbh)->io_mutex) {
 		(*dbh)->io_mutex = sql_manager.io_mutex;
 	}
+	*/
 
 	return r;
 }

src/switch_event.c

@@ -291,6 +291,7 @@ static void *SWITCH_THREAD_FUNC switch_event_thread(switch_thread_t *thread, voi
 	switch_queue_t *queue = (switch_queue_t *) obj;
 	uint32_t index = 0;
 	int my_id = 0;
+	int auto_pause = 0;
 
 	switch_mutex_lock(EVENT_QUEUE_MUTEX);
 	THREAD_COUNT++;
@@ -307,6 +308,14 @@ static void *SWITCH_THREAD_FUNC switch_event_thread(switch_thread_t *thread, voi
 		switch_event_t *event = NULL;
 		int loops = 0;
 
+		if (auto_pause) {
+			if (!--auto_pause) {
+				switch_core_session_ctl(SCSC_PAUSE_INBOUND, &auto_pause);
+			} else {
+				switch_cond_next();
+			}
+		}
+
 		if (switch_queue_pop(queue, &pop) != SWITCH_STATUS_SUCCESS) {
 			break;
 		}
@@ -323,8 +332,22 @@ static void *SWITCH_THREAD_FUNC switch_event_thread(switch_thread_t *thread, voi
 
 		while (event) {
 
+
 			if (++loops > 2) {
-				switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CRIT, "Event system overloading\n");
+				uint32_t last_sps = 0, sess_count = switch_core_session_count();
+				if (auto_pause) {
+					switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CRIT, "Event system *still* overloading.\n");
+				} else {
+					switch_core_session_ctl(SCSC_LAST_SPS, &last_sps);
+					last_sps = (uint32_t) (float) (last_sps * 0.75f);
+					sess_count = (uint32_t) (float) (sess_count * 0.75f);
+					switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CRIT, 
+									  "Event system overloading. Taking a 10 second break, Reducing max_sessions to %d %dsps\n", sess_count, last_sps);
+					switch_core_session_limit(sess_count);
+					switch_core_session_ctl(SCSC_SPS, &last_sps);
+					auto_pause = 10;
+					switch_core_session_ctl(SCSC_PAUSE_INBOUND, &auto_pause);
+				}
 				switch_yield(1000000);
 			}