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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/basictypes.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 SequenceNumberSet DetectLostPackets( | |
| 32 const QuicUnackedPacketMap& unacked_packets, | |
| 33 const QuicTime& time, | |
| 34 QuicPacketSequenceNumber largest_observed, | |
| 35 const RttStats& rtt_stats) override; | |
| 36 | |
| 37 // Returns the time the next packet will be lost, or zero if there | |
| 38 // are no nacked pending packets outstanding. | |
| 39 // TODO(ianswett): Ideally the RTT variance and the RTT would be used to | |
| 40 // determine the time a packet is considered lost. | |
| 41 // TODO(ianswett): Consider using Max(1.25 * srtt, 1.125 * last_rtt). | |
| 42 QuicTime GetLossTimeout() const override; | |
| 43 | |
| 44 private: | |
| 45 QuicTime loss_detection_timeout_; | |
| 46 | |
| 47 DISALLOW_COPY_AND_ASSIGN(TimeLossAlgorithm); | |
| 48 }; | |
| 49 | |
| 50 } // namespace net | |
| 51 | |
| 52 #endif // NET_QUIC_CONGESTION_CONTROL_TIME_LOSS_ALGORITHM_H_ | |
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