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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 <cstdint> | 
| 20 | 20 | 
| 21 #include "base/macros.h" | 21 #include "base/macros.h" | 
| 22 #include "net/quic/core/quic_packets.h" | 22 #include "net/quic/core/quic_packets.h" | 
| 23 #include "net/quic/core/quic_time.h" | 23 #include "net/quic/core/quic_time.h" | 
| 24 #include "net/quic/platform/api/quic_export.h" | 24 #include "net/quic/platform/api/quic_export.h" | 
| 25 | 25 | 
| 26 namespace net { | 26 namespace net { | 
| 27 | 27 | 
| 28 class QUIC_EXPORT_PRIVATE HybridSlowStart { | 28 class QUIC_EXPORT_PRIVATE HybridSlowStart { | 
| 29  public: | 29  public: | 
| (...skipping 45 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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