Set _incomingPacketConcurrency to 1

src/Service.cpp

@@ -272,7 +272,11 @@ public:
 		_ports[1] = 0;
 		_ports[2] = 0;
 
-		_incomingPacketConcurrency = std::max((unsigned long)1,std::min((unsigned long)16,(unsigned long)std::thread::hardware_concurrency()));
+		/* Packet input concurrency is disabled intentially since it
+		would force the user-space network stack to constantly re-order
+		frames, resulting in lower RX performance */
+		_incomingPacketConcurrency = 1;
+		// std::max((unsigned long)1,std::min((unsigned long)16,(unsigned long)std::thread::hardware_concurrency()));
 		char *envPool = std::getenv("INCOMING_PACKET_CONCURRENCY");
 		if (envPool != NULL) {
 			int tmp = atoi(envPool);