tor

commit 4444f5f4ed968f08d26735a2531f03a6c4369226
parent 08c3ee8eca4bf60f3218daeb65acf97da554e80f
Author: Mike Perry <mikeperry-git@torproject.org>
Date:   Sun, 31 Jul 2022 15:09:35 +0000

Use EWMA instead of bare rtt for min rtt.

This allows us to average out minimums due to lulls in activity a bit more.

Diffstat:
M
src/core/or/congestion_control_common.c
 | 
6
++++--

1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/src/core/or/congestion_control_common.c b/src/core/or/congestion_control_common.c
@@ -857,8 +857,10 @@ congestion_control_update_circuit_rtt(congestion_control_t *cc,
     cc->max_rtt_usec = rtt;
   }
 
-  if (cc->min_rtt_usec == 0 || rtt < cc->min_rtt_usec) {
-    cc->min_rtt_usec = rtt;
+  if (cc->min_rtt_usec == 0 || cc->ewma_rtt_usec < cc->min_rtt_usec) {
+    // Using the EWMA for min instead of current RTT helps average out
+    // effects from other conns
+    cc->min_rtt_usec = cc->ewma_rtt_usec;
   }
 
   return rtt;