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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 #include "net/quic/core/congestion_control/hybrid_slow_start.h" | 5 #include "net/quic/core/congestion_control/hybrid_slow_start.h" | 
| 6 | 6 | 
| 7 #include <algorithm> | 7 #include <algorithm> | 
| 8 | 8 | 
| 9 |  | 
| 10 namespace net { | 9 namespace net { | 
| 11 | 10 | 
| 12 // Note(pwestin): the magic clamping numbers come from the original code in | 11 // Note(pwestin): the magic clamping numbers come from the original code in | 
| 13 // tcp_cubic.c. | 12 // tcp_cubic.c. | 
| 14 const int64_t kHybridStartLowWindow = 16; | 13 const int64_t kHybridStartLowWindow = 16; | 
| 15 // Number of delay samples for detecting the increase of delay. | 14 // Number of delay samples for detecting the increase of delay. | 
| 16 const uint32_t kHybridStartMinSamples = 8; | 15 const uint32_t kHybridStartMinSamples = 8; | 
| 17 // Exit slow start if the min rtt has increased by more than 1/8th. | 16 // Exit slow start if the min rtt has increased by more than 1/8th. | 
| 18 const int kHybridStartDelayFactorExp = 3;  // 2^3 = 8 | 17 const int kHybridStartDelayFactorExp = 3;  // 2^3 = 8 | 
| 19 // The original paper specifies 2 and 8ms, but those have changed over time. | 18 // The original paper specifies 2 and 8ms, but those have changed over time. | 
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| 96       hystart_found_ = DELAY; | 95       hystart_found_ = DELAY; | 
| 97     } | 96     } | 
| 98   } | 97   } | 
| 99   // Exit from slow start if the cwnd is greater than 16 and | 98   // Exit from slow start if the cwnd is greater than 16 and | 
| 100   // increasing delay is found. | 99   // increasing delay is found. | 
| 101   return congestion_window >= kHybridStartLowWindow && | 100   return congestion_window >= kHybridStartLowWindow && | 
| 102          hystart_found_ != NOT_FOUND; | 101          hystart_found_ != NOT_FOUND; | 
| 103 } | 102 } | 
| 104 | 103 | 
| 105 }  // namespace net | 104 }  // namespace net | 
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