gfe-relnote: (n/a) Add some log for QUIC bbr2 code. Logging only.

PiperOrigin-RevId: 279745573
Change-Id: Ic06947715a4ca42c04384e7c0ab5e951c7a8db95

quic/core/congestion_control/bbr2_probe_rtt.cc

diff --git a/quic/core/congestion_control/bbr2_probe_rtt.cc b/quic/core/congestion_control/bbr2_probe_rtt.cc
index fe4506b..f9c7709 100644
--- a/quic/core/congestion_control/bbr2_probe_rtt.cc
+++ b/quic/core/congestion_control/bbr2_probe_rtt.cc
@@ -26,6 +26,12 @@
         congestion_event.bytes_in_flight <=
             sender_->GetMinimumCongestionWindow()) {
       exit_time_ = congestion_event.event_time + Params().probe_rtt_duration;
+      QUIC_DVLOG(2) << sender_ << " PROBE_RTT exit time set to " << exit_time_
+                    << ". bytes_inflight:" << congestion_event.bytes_in_flight
+                    << ", inflight_target:" << InflightTarget()
+                    << ", min_congestion_window:"
+                    << sender_->GetMinimumCongestionWindow() << "  @ "
+                    << congestion_event.event_time;
     }
     return Bbr2Mode::PROBE_RTT;
   }

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 b2b4d9b..85136bb 100644
--- a/quic/core/congestion_control/bbr2_simulator_test.cc
+++ b/quic/core/congestion_control/bbr2_simulator_test.cc
@@ -135,9 +135,13 @@
   ~Bbr2DefaultTopologyTest() {
     const auto* test_info =
         ::testing::UnitTest::GetInstance()->current_test_info();
+    const Bbr2Sender::DebugState& debug_state = sender_->ExportDebugState();
     QUIC_LOG(INFO) << "Bbr2DefaultTopologyTest." << test_info->name()
                    << " completed at simulated time: "
-                   << SimulatedNow().ToDebuggingValue() / 1e6 << " sec.";
+                   << SimulatedNow().ToDebuggingValue() / 1e6
+                   << " sec. packet loss:"
+                   << sender_loss_rate_in_packets() * 100
+                   << "%, bw_hi:" << debug_state.bandwidth_hi;
   }
 
   Bbr2Sender* SetupBbr2Sender(simulator::QuicEndpoint* endpoint) {
@@ -771,7 +775,17 @@
         ::testing::UnitTest::GetInstance()->current_test_info();
     QUIC_LOG(INFO) << "Bbr2MultiSenderTest." << test_info->name()
                    << " completed at simulated time: "
-                   << SimulatedNow().ToDebuggingValue() / 1e6 << " sec.";
+                   << SimulatedNow().ToDebuggingValue() / 1e6
+                   << " sec. Per sender stats:";
+    for (size_t i = 0; i < sender_endpoints_.size(); ++i) {
+      QUIC_LOG(INFO) << "sender[" << i << "]: "
+                     << sender_connection(i)
+                            ->sent_packet_manager()
+                            .GetSendAlgorithm()
+                            ->GetCongestionControlType()
+                     << ", packet_loss:"
+                     << 100.0 * sender_loss_rate_in_packets(i) << "%";
+    }
   }
 
   Bbr2Sender* SetupBbr2Sender(simulator::QuicEndpoint* endpoint) {
@@ -838,6 +852,19 @@
 
   QuicTime SimulatedNow() const { return simulator_.GetClock()->Now(); }
 
+  QuicConnection* sender_connection(size_t which) {
+    return sender_endpoints_[which]->connection();
+  }
+
+  const QuicConnectionStats& sender_connection_stats(size_t which) {
+    return sender_connection(which)->GetStats();
+  }
+
+  float sender_loss_rate_in_packets(size_t which) {
+    return static_cast<float>(sender_connection_stats(which).packets_lost) /
+           sender_connection_stats(which).packets_sent;
+  }
+
   simulator::Simulator simulator_;
   std::vector<std::unique_ptr<simulator::QuicEndpoint>> sender_endpoints_;
   std::vector<std::unique_ptr<simulator::QuicEndpoint>> receiver_endpoints_;