Internal QUICHE change

PiperOrigin-RevId: 263225274
Change-Id: Ice0f7386553a73fd42d1a9ca6ee017126b25629b

quic/core/congestion_control/bbr2_sender.cc

diff --git a/quic/core/congestion_control/bbr2_sender.cc b/quic/core/congestion_control/bbr2_sender.cc
index 66aa123..9cd40b9 100644
--- a/quic/core/congestion_control/bbr2_sender.cc
+++ b/quic/core/congestion_control/bbr2_sender.cc
@@ -69,8 +69,9 @@
              rtt_stats->last_update_time(),
              /*cwnd_gain=*/1.0,
              /*pacing_gain=*/kInitialPacingGain),
-      cwnd_(
+      initial_cwnd_(
           cwnd_limits().ApplyLimits(initial_cwnd_in_packets * kDefaultTCPMSS)),
+      cwnd_(initial_cwnd_),
       pacing_rate_(kInitialPacingGain * QuicBandwidth::FromBytesAndTimeDelta(
                                             cwnd_,
                                             rtt_stats->SmoothedOrInitialRtt())),
@@ -240,7 +241,7 @@
   if (startup_.FullBandwidthReached()) {
     target_cwnd += model_.MaxAckHeight();
     cwnd_ = std::min(prior_cwnd + bytes_acked, target_cwnd);
-  } else if (prior_cwnd < target_cwnd || prior_cwnd < 2 * cwnd_limits().Min()) {
+  } else if (prior_cwnd < target_cwnd || prior_cwnd < 2 * initial_cwnd_) {
     cwnd_ = prior_cwnd + bytes_acked;
   }
   const QuicByteCount desired_cwnd = cwnd_;

quic/core/congestion_control/bbr2_sender.h

diff --git a/quic/core/congestion_control/bbr2_sender.h b/quic/core/congestion_control/bbr2_sender.h
index 64f6347..b58dd93 100644
--- a/quic/core/congestion_control/bbr2_sender.h
+++ b/quic/core/congestion_control/bbr2_sender.h
@@ -161,6 +161,8 @@
 
   Bbr2NetworkModel model_;
 
+  const QuicByteCount initial_cwnd_;
+
   // Current cwnd and pacing rate.
   QuicByteCount cwnd_;
   QuicBandwidth pacing_rate_;

quic/core/congestion_control/bbr2_simulator_test.cc

diff --git a/quic/core/congestion_control/bbr2_simulator_test.cc b/quic/core/congestion_control/bbr2_simulator_test.cc
index 736327f..ab4b67b 100644
--- a/quic/core/congestion_control/bbr2_simulator_test.cc
+++ b/quic/core/congestion_control/bbr2_simulator_test.cc
@@ -426,13 +426,13 @@
 
   sender_endpoint_.AddBytesToTransfer(20 * 1024 * 1024);
 
-  simulator_.RunFor(QuicTime::Delta::FromSeconds(10));
+  simulator_.RunFor(QuicTime::Delta::FromSeconds(15));
   EXPECT_TRUE(Bbr2ModeIsOneOf({Bbr2Mode::PROBE_BW, Bbr2Mode::PROBE_RTT}));
   QUIC_LOG(INFO) << "Bandwidth increasing at time " << SimulatedNow();
 
   EXPECT_APPROX_EQ(params.test_link.bandwidth,
                    sender_->ExportDebugState().bandwidth_est, 0.1f);
-  EXPECT_LE(sender_loss_rate_in_packets(), 0.20);
+  EXPECT_LE(sender_loss_rate_in_packets(), 0.30);
 
   // Now increase the bottleneck bandwidth from 100Kbps to 10Mbps.
   params.test_link.bandwidth = QuicBandwidth::FromKBitsPerSecond(10000);