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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. |
11 // This does not implement ack train detection because it interacts poorly with | 11 // This does not implement ack train detection because it interacts poorly with |
12 // pacing. | 12 // pacing. |
13 // http://netsrv.csc.ncsu.edu/export/hybridstart_pfldnet08.pdf | 13 // http://netsrv.csc.ncsu.edu/export/hybridstart_pfldnet08.pdf |
14 // http://research.csc.ncsu.edu/netsrv/sites/default/files/hystart_techreport_20
08.pdf | 14 // http://research.csc.ncsu.edu/netsrv/sites/default/files/hystart_techreport_20
08.pdf |
15 | 15 |
16 #ifndef NET_QUIC_CONGESTION_CONTROL_HYBRID_SLOW_START_H_ | 16 #ifndef NET_QUIC_CONGESTION_CONTROL_HYBRID_SLOW_START_H_ |
17 #define NET_QUIC_CONGESTION_CONTROL_HYBRID_SLOW_START_H_ | 17 #define NET_QUIC_CONGESTION_CONTROL_HYBRID_SLOW_START_H_ |
18 | 18 |
19 #include "base/basictypes.h" | 19 #include <stdint.h> |
| 20 |
| 21 #include "base/macros.h" |
20 #include "net/base/net_export.h" | 22 #include "net/base/net_export.h" |
21 #include "net/quic/quic_protocol.h" | 23 #include "net/quic/quic_protocol.h" |
22 #include "net/quic/quic_time.h" | 24 #include "net/quic/quic_time.h" |
23 | 25 |
24 namespace net { | 26 namespace net { |
25 | 27 |
26 class NET_EXPORT_PRIVATE HybridSlowStart { | 28 class NET_EXPORT_PRIVATE HybridSlowStart { |
27 public: | 29 public: |
28 HybridSlowStart(); | 30 HybridSlowStart(); |
29 | 31 |
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64 }; | 66 }; |
65 | 67 |
66 // Whether the hybrid slow start has been started. | 68 // Whether the hybrid slow start has been started. |
67 bool started_; | 69 bool started_; |
68 HystartState hystart_found_; | 70 HystartState hystart_found_; |
69 // Last packet number sent which was CWND limited. | 71 // Last packet number sent which was CWND limited. |
70 QuicPacketNumber last_sent_packet_number_; | 72 QuicPacketNumber last_sent_packet_number_; |
71 | 73 |
72 // Variables for tracking acks received during a slow start round. | 74 // Variables for tracking acks received during a slow start round. |
73 QuicPacketNumber end_packet_number_; // End of the receive round. | 75 QuicPacketNumber end_packet_number_; // End of the receive round. |
74 uint32 rtt_sample_count_; // Number of rtt samples in the current round. | 76 uint32_t rtt_sample_count_; // Number of rtt samples in the current round. |
75 QuicTime::Delta current_min_rtt_; // The minimum rtt of current round. | 77 QuicTime::Delta current_min_rtt_; // The minimum rtt of current round. |
76 | 78 |
77 DISALLOW_COPY_AND_ASSIGN(HybridSlowStart); | 79 DISALLOW_COPY_AND_ASSIGN(HybridSlowStart); |
78 }; | 80 }; |
79 | 81 |
80 } // namespace net | 82 } // namespace net |
81 | 83 |
82 #endif // NET_QUIC_CONGESTION_CONTROL_HYBRID_SLOW_START_H_ | 84 #endif // NET_QUIC_CONGESTION_CONTROL_HYBRID_SLOW_START_H_ |
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