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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 // | 4 // |
5 // TCP cubic send side congestion algorithm, emulates the behavior of | 5 // TCP cubic send side congestion algorithm, emulates the behavior of |
6 // TCP cubic. | 6 // TCP cubic. |
7 | 7 |
8 #ifndef NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_SENDER_H_ | 8 #ifndef NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_SENDER_H_ |
9 #define NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_SENDER_H_ | 9 #define NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_SENDER_H_ |
10 | 10 |
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37 bool reno, | 37 bool reno, |
38 QuicPacketCount initial_tcp_congestion_window, | 38 QuicPacketCount initial_tcp_congestion_window, |
39 QuicPacketCount max_tcp_congestion_window, | 39 QuicPacketCount max_tcp_congestion_window, |
40 QuicConnectionStats* stats); | 40 QuicConnectionStats* stats); |
41 ~TcpCubicSender() override; | 41 ~TcpCubicSender() override; |
42 | 42 |
43 // Start implementation of SendAlgorithmInterface. | 43 // Start implementation of SendAlgorithmInterface. |
44 void SetFromConfig(const QuicConfig& config, | 44 void SetFromConfig(const QuicConfig& config, |
45 bool is_server, | 45 bool is_server, |
46 bool using_pacing) override; | 46 bool using_pacing) override; |
47 void ResumeConnectionState( | 47 bool ResumeConnectionState( |
48 const CachedNetworkParameters& cached_network_params) override; | 48 const CachedNetworkParameters& cached_network_params) override; |
49 void SetNumEmulatedConnections(int num_connections) override; | 49 void SetNumEmulatedConnections(int num_connections) override; |
50 void OnCongestionEvent(bool rtt_updated, | 50 void OnCongestionEvent(bool rtt_updated, |
51 QuicByteCount bytes_in_flight, | 51 QuicByteCount bytes_in_flight, |
52 const CongestionVector& acked_packets, | 52 const CongestionVector& acked_packets, |
53 const CongestionVector& lost_packets) override; | 53 const CongestionVector& lost_packets) override; |
54 bool OnPacketSent(QuicTime sent_time, | 54 bool OnPacketSent(QuicTime sent_time, |
55 QuicByteCount bytes_in_flight, | 55 QuicByteCount bytes_in_flight, |
56 QuicPacketSequenceNumber sequence_number, | 56 QuicPacketSequenceNumber sequence_number, |
57 QuicByteCount bytes, | 57 QuicByteCount bytes, |
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111 // Track the largest packet that has been acked. | 111 // Track the largest packet that has been acked. |
112 QuicPacketSequenceNumber largest_acked_sequence_number_; | 112 QuicPacketSequenceNumber largest_acked_sequence_number_; |
113 | 113 |
114 // Track the largest sequence number outstanding when a CWND cutback occurs. | 114 // Track the largest sequence number outstanding when a CWND cutback occurs. |
115 QuicPacketSequenceNumber largest_sent_at_last_cutback_; | 115 QuicPacketSequenceNumber largest_sent_at_last_cutback_; |
116 | 116 |
117 // Congestion window in packets. | 117 // Congestion window in packets. |
118 QuicPacketCount congestion_window_; | 118 QuicPacketCount congestion_window_; |
119 | 119 |
120 // Congestion window before the last loss event or RTO. | 120 // Congestion window before the last loss event or RTO. |
121 QuicByteCount previous_congestion_window_; | 121 QuicPacketCount previous_congestion_window_; |
122 | 122 |
123 // Slow start congestion window in packets, aka ssthresh. | 123 // Slow start congestion window in packets, aka ssthresh. |
124 QuicPacketCount slowstart_threshold_; | 124 QuicPacketCount slowstart_threshold_; |
125 | 125 |
126 // Slow start threshold before the last loss event or RTO. | 126 // Slow start threshold before the last loss event or RTO. |
127 QuicPacketCount previous_slowstart_threshold_; | 127 QuicPacketCount previous_slowstart_threshold_; |
128 | 128 |
129 // Whether the last loss event caused us to exit slowstart. | 129 // Whether the last loss event caused us to exit slowstart. |
130 // Used for stats collection of slowstart_packets_lost | 130 // Used for stats collection of slowstart_packets_lost |
131 bool last_cutback_exited_slowstart_; | 131 bool last_cutback_exited_slowstart_; |
132 | 132 |
133 // Maximum number of outstanding packets for tcp. | 133 // Maximum number of outstanding packets for tcp. |
134 QuicPacketCount max_tcp_congestion_window_; | 134 QuicPacketCount max_tcp_congestion_window_; |
135 | 135 |
136 const QuicClock* clock_; | 136 const QuicClock* clock_; |
137 | 137 |
138 DISALLOW_COPY_AND_ASSIGN(TcpCubicSender); | 138 DISALLOW_COPY_AND_ASSIGN(TcpCubicSender); |
139 }; | 139 }; |
140 | 140 |
141 } // namespace net | 141 } // namespace net |
142 | 142 |
143 #endif // NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_SENDER_H_ | 143 #endif // NET_QUIC_CONGESTION_CONTROL_TCP_CUBIC_SENDER_H_ |
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