commit f2c4e3ef544be0de9745fd5ee69f0f24c366a406
author fayang <fayang@google.com> Wed Oct 30 07:46:51 2019 -0700
committer Copybara-Service <copybara-worker@google.com> Wed Oct 30 07:47:26 2019 -0700
tree 8f010974f0f674bab929cf7e94baf346caf8be34
parent c14a589f0adaf5baa5e2d955eb52f1af95fc2151

gfe-relnote: In QUIC, re-calculate pacing rate when cwnd gets bootstrapped. Protected by gfe2_reloadable_flag_quic_bbr_fix_pacing_rate.

PiperOrigin-RevId: 277502654
Change-Id: I2c76d7a6ddb7e6097ed294d08b51678e455fa2b1

quic/core/congestion_control/bbr_sender.cc

diff --git a/quic/core/congestion_control/bbr_sender.cc b/quic/core/congestion_control/bbr_sender.cc
index b0fd50d..1ba6b42 100644
--- a/quic/core/congestion_control/bbr_sender.cc
+++ b/quic/core/congestion_control/bbr_sender.cc
@@ -372,6 +372,13 @@
       set_high_cwnd_gain(kDerivedHighCWNDGain);
     }
     congestion_window_ = new_cwnd;
+    if (GetQuicReloadableFlag(quic_bbr_fix_pacing_rate)) {
+      QUIC_RELOADABLE_FLAG_COUNT(quic_bbr_fix_pacing_rate);
+      // Pace at the rate of new_cwnd / RTT.
+      QuicBandwidth new_pacing_rate =
+          QuicBandwidth::FromBytesAndTimeDelta(congestion_window_, GetMinRtt());
+      pacing_rate_ = std::max(pacing_rate_, new_pacing_rate);
+    }
   }
 }