From: Mike Perry <mikeperry-git@torproject.org>
Date: Sun, 23 Jan 2022 18:15:12 +0000 (+0000)
Subject: Exit slow start at the gamma threshold
X-Git-Tag: tor-0.4.7.4-alpha~15
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3a3f111b23d6d989dcae5858e2ab597a34f7910b;p=thirdparty%2Ftor.git

Exit slow start at the gamma threshold

This improves performance and fairness.
---

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");
       }