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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_CORE_CONGESTION_CONTROL_HYBRID_SLOW_START_H_ | 16 #ifndef NET_QUIC_CORE_CONGESTION_CONTROL_HYBRID_SLOW_START_H_ |
| 17 #define NET_QUIC_CORE_CONGESTION_CONTROL_HYBRID_SLOW_START_H_ | 17 #define NET_QUIC_CORE_CONGESTION_CONTROL_HYBRID_SLOW_START_H_ |
| 18 | 18 |
| 19 #include <stdint.h> | 19 #include <stdint.h> |
| 20 | 20 |
| 21 #include "base/macros.h" | 21 #include "base/macros.h" |
| 22 #include "net/base/net_export.h" | |
| 23 #include "net/quic/core/quic_packets.h" | 22 #include "net/quic/core/quic_packets.h" |
| 24 #include "net/quic/core/quic_time.h" | 23 #include "net/quic/core/quic_time.h" |
| 24 #include "net/quic/platform/api/quic_export.h" |
| 25 | 25 |
| 26 namespace net { | 26 namespace net { |
| 27 | 27 |
| 28 class NET_EXPORT_PRIVATE HybridSlowStart { | 28 class QUIC_EXPORT_PRIVATE HybridSlowStart { |
| 29 public: | 29 public: |
| 30 HybridSlowStart(); | 30 HybridSlowStart(); |
| 31 | 31 |
| 32 void OnPacketAcked(QuicPacketNumber acked_packet_number); | 32 void OnPacketAcked(QuicPacketNumber acked_packet_number); |
| 33 | 33 |
| 34 void OnPacketSent(QuicPacketNumber packet_number); | 34 void OnPacketSent(QuicPacketNumber packet_number); |
| 35 | 35 |
| 36 // ShouldExitSlowStart should be called on every new ack frame, since a new | 36 // ShouldExitSlowStart should be called on every new ack frame, since a new |
| 37 // RTT measurement can be made then. | 37 // RTT measurement can be made then. |
| 38 // rtt: the RTT for this ack packet. | 38 // rtt: the RTT for this ack packet. |
| (...skipping 36 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
| 75 QuicPacketNumber end_packet_number_; // End of the receive round. | 75 QuicPacketNumber end_packet_number_; // End of the receive round. |
| 76 uint32_t 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. |
| 77 QuicTime::Delta current_min_rtt_; // The minimum rtt of current round. | 77 QuicTime::Delta current_min_rtt_; // The minimum rtt of current round. |
| 78 | 78 |
| 79 DISALLOW_COPY_AND_ASSIGN(HybridSlowStart); | 79 DISALLOW_COPY_AND_ASSIGN(HybridSlowStart); |
| 80 }; | 80 }; |
| 81 | 81 |
| 82 } // namespace net | 82 } // namespace net |
| 83 | 83 |
| 84 #endif // NET_QUIC_CORE_CONGESTION_CONTROL_HYBRID_SLOW_START_H_ | 84 #endif // NET_QUIC_CORE_CONGESTION_CONTROL_HYBRID_SLOW_START_H_ |
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