For #307, enable REUSEPORT to increase UDP buffer

trunk/conf/full.conf

@@ -430,6 +430,11 @@ rtc_server {
     # @remark Should always turn it on, or Chrome will fail.
     # default: on
     encrypt         on;
+    # We listen multiple times at the same port, by REUSEPORT, to increase the UDP queue.
+    # Note that you can set to 1 and increase the system UDP buffer size by net.core.rmem_max
+    # or just increase this to get larger UDP recv and send buffer.
+    # default: 4
+    reuseport       4;
 }
 
 vhost rtc.vhost.srs.com {

trunk/src/app/srs_app_config.cpp

@@ -3614,7 +3614,7 @@ srs_error_t SrsConfig::check_normal_config()
         for (int i = 0; conf && i < (int)conf->directives.size(); i++) {
             string n = conf->at(i)->name;
             if (n != "enabled" && n != "listen" && n != "dir" && n != "candidate" && n != "ecdsa"
-                && n != "sendmmsg" && n != "encrypt") {
+                && n != "sendmmsg" && n != "encrypt" && n != "reuseport") {
                 return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal rtc_server.%s", n.c_str());
             }
         }
@@ -4745,6 +4745,33 @@ int SrsConfig::get_rtc_server_sendmmsg()
 #endif
 }
 
+int SrsConfig::get_rtc_server_reuseport()
+{
+#if defined(SO_REUSEPORT)
+    static int DEFAULT = 4;
+#else
+    static int DEFAULT = 1;
+#endif
+
+    SrsConfDirective* conf = root->get("rtc_server");
+    if (!conf) {
+        return DEFAULT;
+    }
+
+    conf = conf->get("reuseport");
+    if (!conf || conf->arg0().empty()) {
+        return DEFAULT;
+    }
+
+    int reuseport = ::atoi(conf->arg0().c_str());
+#if !defined(SO_REUSEPORT)
+    srs_warn("REUSEPORT not supported, reset %d to %d", reuseport, DEFAULT);
+    reuseport = DEFAULT
+#endif
+
+    return reuseport;
+}
+
 SrsConfDirective* SrsConfig::get_rtc(string vhost)
 {
     SrsConfDirective* conf = get_vhost(vhost);

trunk/src/app/srs_app_config.hpp

@@ -527,6 +527,7 @@ public:
     virtual bool get_rtc_server_ecdsa();
     virtual int get_rtc_server_sendmmsg();
     virtual bool get_rtc_server_encrypt();
+    virtual int get_rtc_server_reuseport();
 
     SrsConfDirective* get_rtc(std::string vhost);
     bool get_rtc_enabled(std::string vhost);

trunk/src/app/srs_app_listener.cpp

@@ -391,6 +391,7 @@ srs_error_t SrsUdpMuxListener::listen()
 void SrsUdpMuxListener::set_socket_buffer()
 {
     int default_sndbuf = 0;
+    // TODO: FIXME: Config it.
     int expect_sndbuf = 1024*1024*10; // 10M
     int actual_sndbuf = expect_sndbuf;
     int r0_sndbuf = 0;
@@ -407,6 +408,7 @@ void SrsUdpMuxListener::set_socket_buffer()
     }
 
     int default_rcvbuf = 0;
+    // TODO: FIXME: Config it.
     int expect_rcvbuf = 1024*1024*10; // 10M
     int actual_rcvbuf = expect_rcvbuf;
     int r0_rcvbuf = 0;

trunk/src/app/srs_app_rtc_conn.cpp

@@ -1332,7 +1332,6 @@ srs_error_t SrsRtcSession::on_rtcp(SrsUdpMuxSocket* skt)
 
 SrsRtcServer::SrsRtcServer()
 {
-    listener = NULL;
     timer = new SrsHourGlass(this, 1 * SRS_UTIME_SECONDS);
 
     mmstfd = NULL;
@@ -1349,7 +1348,12 @@ SrsRtcServer::~SrsRtcServer()
 {
     _srs_config->unsubscribe(this);
 
+    vector<SrsUdpMuxListener*>::iterator it;
+    for (it = listeners.begin(); it != listeners.end(); ++it) {
+        SrsUdpMuxListener* listener = *it;
         srs_freep(listener);
+    }
+
     srs_freep(timer);
 
     srs_freep(trd);
@@ -1400,15 +1404,20 @@ srs_error_t SrsRtcServer::listen_udp()
     }
 
     string ip = srs_any_address_for_listener();
+    srs_assert(listeners.empty());
 
-    srs_freep(listener);
+    int nn_listeners = _srs_config->get_rtc_server_reuseport();
-    listener = new SrsUdpMuxListener(this, ip, port);
+    for (int i = 0; i < nn_listeners; i++) {
+        SrsUdpMuxListener* listener = new SrsUdpMuxListener(this, ip, port);
 
         if ((err = listener->listen()) != srs_success) {
+            srs_freep(listener);
             return srs_error_wrap(err, "listen %s:%d", ip.c_str(), port);
         }
 
         srs_trace("rtc listen at udp://%s:%d, fd=%d", ip.c_str(), port, listener->fd());
+        listeners.push_back(listener);
+    }
 
     return err;
 }

trunk/src/app/srs_app_rtc_conn.hpp

@@ -233,7 +233,7 @@ class SrsRtcServer : virtual public ISrsUdpMuxHandler, virtual public ISrsHourGl
     virtual public ISrsCoroutineHandler, virtual public ISrsReloadHandler
 {
 private:
-    SrsUdpMuxListener* listener;
+    std::vector<SrsUdpMuxListener*> listeners;
     SrsHourGlass* timer;
 private:
     SrsCoroutine* trd;