commit efefc6b4b219e2897e48def83352b4df52bc03a0
author Florin Coras <fcoras@cisco.com> Wed Nov 07 12:49:19 2018 -0800
committer Damjan Marion <dmarion@me.com> Thu Nov 08 11:20:29 2018 +0000
tree 50e7a57901e34365c1c4f5dc8868c705b192d864
parent 221d6f131d644b2d14f741c4b3031f53b8a8ff03

tcp: pacer and mrtt estimation improvements

- update pacer once per burst
- better estimate initial rtt
- compute smoothed average for higher precision rtt estimate

Change-Id: I06d41a98784cdf861bedfbee2e7d0afc0d0154ef
Signed-off-by: Florin Coras <fcoras@cisco.com>

src/vnet/tcp/tcp_output.c

diff --git a/src/vnet/tcp/tcp_output.c b/src/vnet/tcp/tcp_output.c
index 089f85a..192e820 100644
--- a/src/vnet/tcp/tcp_output.c
+++ b/src/vnet/tcp/tcp_output.c
@@ -1000,7 +1000,7 @@
   tcp_make_syn (tc, b);
 
   /* Measure RTT with this */
-  tc->rtt_ts = tcp_time_now ();
+  tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0);
   tc->rtt_seq = tc->snd_nxt;
   tc->rto_boff = 0;