Add minimum sender buffer

prrt/time-protocol.h

@@ -31,9 +31,12 @@ static inline socket_t _open_sender(struct arguments *args)
     assert(!fail);
     int sock;
     struct addrinfo *iter;
+    int send_buffer_size = 2048;
 
     for (iter = head; iter != NULL; iter = iter->ai_next) {
         sock = socket(iter->ai_family, iter->ai_socktype, iter->ai_protocol);
+
+        setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &send_buffer_size, sizeof(send_buffer_size));
         if (0 ==connect(sock, iter->ai_addr, iter->ai_addrlen))
             break;
         close(sock);