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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef NET_QUIC_CONGESTION_CONTROL_TIME_LOSS_ALGORITHM_H_ | |
6 #define NET_QUIC_CONGESTION_CONTROL_TIME_LOSS_ALGORITHM_H_ | |
7 | |
8 #include <algorithm> | |
9 #include <map> | |
10 | |
11 #include "base/macros.h" | |
12 #include "net/quic/congestion_control/loss_detection_interface.h" | |
13 #include "net/quic/quic_protocol.h" | |
14 #include "net/quic/quic_time.h" | |
15 #include "net/quic/quic_unacked_packet_map.h" | |
16 | |
17 namespace net { | |
18 | |
19 // A loss detection algorithm which avoids spurious losses and retransmissions | |
20 // by waiting 1.25 RTTs after a packet was sent instead of nack count. | |
21 class NET_EXPORT_PRIVATE TimeLossAlgorithm : public LossDetectionInterface { | |
22 public: | |
23 TimeLossAlgorithm(); | |
24 ~TimeLossAlgorithm() override {} | |
25 | |
26 LossDetectionType GetLossDetectionType() const override; | |
27 | |
28 // Declares pending packets less than the largest observed lost when it has | |
29 // been 1.25 RTT since they were sent. Packets larger than the largest | |
30 // observed are retransmitted via TLP. | |
31 PacketNumberSet DetectLostPackets(const QuicUnackedPacketMap& unacked_packets, | |
32 const QuicTime& time, | |
33 QuicPacketNumber largest_observed, | |
34 const RttStats& rtt_stats) override; | |
35 | |
36 // Unsupported. | |
37 void DetectLosses( | |
38 const QuicUnackedPacketMap& unacked_packets, | |
39 const QuicTime& time, | |
40 const RttStats& rtt_stats, | |
41 SendAlgorithmInterface::CongestionVector* packets_lost) override; | |
42 | |
43 // Returns the time the next packet will be lost, or zero if there | |
44 // are no nacked pending packets outstanding. | |
45 // TODO(ianswett): Ideally the RTT variance and the RTT would be used to | |
46 // determine the time a packet is considered lost. | |
47 // TODO(ianswett): Consider using Max(1.25 * srtt, 1.125 * last_rtt). | |
48 QuicTime GetLossTimeout() const override; | |
49 | |
50 private: | |
51 QuicTime loss_detection_timeout_; | |
52 | |
53 DISALLOW_COPY_AND_ASSIGN(TimeLossAlgorithm); | |
54 }; | |
55 | |
56 } // namespace net | |
57 | |
58 #endif // NET_QUIC_CONGESTION_CONTROL_TIME_LOSS_ALGORITHM_H_ | |
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