tcp: measure us rtt with syn-ack

Change-Id: I20820145377060e12aeeb23b433206c79fd88332
Signed-off-by: Florin Coras <fcoras@cisco.com>

diff --git a/src/vnet/tcp/tcp_output.c b/src/vnet/tcp/tcp_output.c
index 0cf7fa9..74fc15f 100644 (file)
--- a/src/vnet/tcp/tcp_output.c
+++ b/src/vnet/tcp/tcp_output.c
@@ -1021,6 +1021,7 @@ tcp_send_synack (tcp_connection_t * tc)
   if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi)))
     return;
 
+  tc->rtt_ts = tcp_time_now_us (tc->c_thread_index);
   b = vlib_get_buffer (vm, bi);
   tcp_make_synack (tc, b);
   tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4);