[tor-commits] [tor/main] Exit slow start at the gamma threshold

[dgoulet at torproject.org]

commit 3a3f111b23d6d989dcae5858e2ab597a34f7910b
Author: Mike Perry <mikeperry-git at torproject.org>
Date:   Sun Jan 23 18:15:12 2022 +0000

    Exit slow start at the gamma threshold
    
    This improves performance and fairness.
---
 src/core/or/congestion_control_vegas.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/core/or/congestion_control_vegas.c b/src/core/or/congestion_control_vegas.c
index 0ebff17faf..ff825f94cc 100644
--- a/src/core/or/congestion_control_vegas.c
+++ b/src/core/or/congestion_control_vegas.c
@@ -210,8 +210,8 @@ congestion_control_vegas_process_sendme(congestion_control_t *cc,
         cc->cwnd = MAX(cc->cwnd + MAX(CWND_INC_SS(cc), 2*cc->sendme_inc),
                        vegas_bdp_mix(cc));
       } else {
-        /* Congestion signal: Fall back to Vegas equilibrium (BDP) */
-        cc->cwnd = vegas_bdp_mix(cc);
+        /* Congestion signal: Set cwnd to gamma threshhold */
+        cc->cwnd = vegas_bdp_mix(cc) + cc->vegas_params.gamma;
         cc->in_slow_start = 0;
         log_info(LD_CIRC, "CC: TOR_VEGAS exiting slow start");
       }