-
- /* Calculate RTT.
- The RTT is the time between the MTU probe burst was sent and the first
- reply is received.
- */
-
- struct timeval now, diff;
- gettimeofday(&now, NULL);
- timersub(&now, &n->probe_time, &diff);
-
- struct timeval probe_timestamp = now;
- if (DATA(packet)[0] == 2 && packet->len >= 11) {
- uint32_t sec; memcpy(&sec, DATA(packet) + 3, 4);
- uint32_t usec; memcpy(&usec, DATA(packet) + 7, 4);
- probe_timestamp.tv_sec = ntohl(sec);
- probe_timestamp.tv_usec = ntohl(usec);
- }
-
- n->probe_counter++;
-
- if(n->probe_counter == 1) {
- n->rtt = diff.tv_sec + diff.tv_usec * 1e-6;
- n->probe_time = probe_timestamp;
- logger(DEBUG_TRAFFIC, LOG_DEBUG, "%s (%s) RTT %.2f ms, rx packet loss %.2f %%", n->name, n->hostname, n->rtt * 1e3, n->packetloss * 1e2);
- }