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Side by Side Diff: net/quic/congestion_control/hybrid_slow_start.h

Issue 266243004: Clang format slam. Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 6 years, 7 months ago
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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 // This class is a helper class to TcpCubicSender. 5 // This class is a helper class to TcpCubicSender.
6 // Slow start is the initial startup phase of TCP, it lasts until first packet 6 // Slow start is the initial startup phase of TCP, it lasts until first packet
7 // loss. This class implements hybrid slow start of the TCP cubic send side 7 // loss. This class implements hybrid slow start of the TCP cubic send side
8 // congestion algorithm. The key feaure of hybrid slow start is that it tries to 8 // congestion algorithm. The key feaure of hybrid slow start is that it tries to
9 // avoid running into the wall too hard during the slow start phase, which 9 // avoid running into the wall too hard during the slow start phase, which
10 // the traditional TCP implementation does. 10 // the traditional TCP implementation does.
(...skipping 36 matching lines...) Expand 10 before | Expand all | Expand 10 after
47 // a follow up CL to update the unit test. 47 // a follow up CL to update the unit test.
48 // Returns true if this ack the last sequence number of our current slow start 48 // Returns true if this ack the last sequence number of our current slow start
49 // round. 49 // round.
50 // Call Reset if this returns true. 50 // Call Reset if this returns true.
51 bool IsEndOfRound(QuicPacketSequenceNumber ack) const; 51 bool IsEndOfRound(QuicPacketSequenceNumber ack) const;
52 52
53 // Call for the start of each receive round (burst) in the slow start phase. 53 // Call for the start of each receive round (burst) in the slow start phase.
54 void StartReceiveRound(QuicPacketSequenceNumber last_sent); 54 void StartReceiveRound(QuicPacketSequenceNumber last_sent);
55 55
56 // Whether slow start has started. 56 // Whether slow start has started.
57 bool started() const { 57 bool started() const { return started_; }
58 return started_;
59 }
60 58
61 private: 59 private:
62 // Whether a condition for exiting slow start has been found. 60 // Whether a condition for exiting slow start has been found.
63 enum HystartState { 61 enum HystartState {
64 NOT_FOUND, 62 NOT_FOUND,
65 ACK_TRAIN, // A closely spaced ack train is too long. 63 ACK_TRAIN, // A closely spaced ack train is too long.
66 DELAY, // Too much increase in the round's min_rtt was observed. 64 DELAY, // Too much increase in the round's min_rtt was observed.
67 }; 65 };
68 66
69 const QuicClock* clock_; 67 const QuicClock* clock_;
70 // Whether the hybrid slow start has been started. 68 // Whether the hybrid slow start has been started.
71 bool started_; 69 bool started_;
72 HystartState hystart_found_; 70 HystartState hystart_found_;
73 // Last sequence number sent which was CWND limited. 71 // Last sequence number sent which was CWND limited.
74 QuicPacketSequenceNumber last_sent_sequence_number_; 72 QuicPacketSequenceNumber last_sent_sequence_number_;
75 73
76 // Variables for tracking acks received during a slow start round. 74 // Variables for tracking acks received during a slow start round.
77 QuicTime round_start_; // Beginning of each slow start receive round. 75 QuicTime round_start_; // Beginning of each slow start receive round.
78 QuicPacketSequenceNumber end_sequence_number_; // End of the receive round. 76 QuicPacketSequenceNumber end_sequence_number_; // End of the receive round.
79 // Last time when the spacing between ack arrivals was less than 2 ms. 77 // Last time when the spacing between ack arrivals was less than 2 ms.
80 // Defaults to the beginning of the round. 78 // Defaults to the beginning of the round.
81 QuicTime last_close_ack_pair_time_; 79 QuicTime last_close_ack_pair_time_;
82 uint32 rtt_sample_count_; // Number of rtt samples in the current round. 80 uint32 rtt_sample_count_; // Number of rtt samples in the current round.
83 QuicTime::Delta current_min_rtt_; // The minimum rtt of current round. 81 QuicTime::Delta current_min_rtt_; // The minimum rtt of current round.
84 82
85 DISALLOW_COPY_AND_ASSIGN(HybridSlowStart); 83 DISALLOW_COPY_AND_ASSIGN(HybridSlowStart);
86 }; 84 };
87 85
88 } // namespace net 86 } // namespace net
89 87
90 #endif // NET_QUIC_CONGESTION_CONTROL_HYBRID_SLOW_START_H_ 88 #endif // NET_QUIC_CONGESTION_CONTROL_HYBRID_SLOW_START_H_
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