relnote: Limit the number of burst tokens in QUIC's pacing sender to the

net/quic/congestion_control/pacing_sender.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // A send algorithm that adds pacing on top of an another send algorithm.
 // It uses the underlying sender's pacing rate to schedule packets.
 // It also takes into consideration the expected granularity of the underlying
 // alarm to ensure that alarms are not set too aggressively, and err towards
 // sending packets too early instead of too late.
 
@@ skipping 52 matching lines @@
   bool InSlowStart() const override;
   bool InRecovery() const override;
   QuicByteCount GetSlowStartThreshold() const override;
   CongestionControlType GetCongestionControlType() const override;
   // End implementation of SendAlgorithmInterface.
 
  private:
   scoped_ptr<SendAlgorithmInterface> sender_;  // Underlying sender.
   // The estimated system alarm granularity.
   const QuicTime::Delta alarm_granularity_;
-  // Configured size of the burst coming out of quiescence.
+  // Configured maximum size of the burst coming out of quiescence.  The burst
+  // is never larger than the current CWND in packets.
   const uint32 initial_packet_burst_;
   // Number of unpaced packets to be sent before packets are delayed.
   uint32 burst_tokens_;
   // Send time of the last packet considered delayed.
   QuicTime last_delayed_packet_sent_time_;
   QuicTime ideal_next_packet_send_time_;  // When can the next packet be sent.
   mutable bool was_last_send_delayed_;  // True when the last send was delayed.
 
   DISALLOW_COPY_AND_ASSIGN(PacingSender);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_