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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 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/rtt_stats.h" | 5 #include "net/quic/core/congestion_control/rtt_stats.h" | 
| 6 | 6 | 
| 7 #include <cstdlib>  // std::abs | 7 #include <cstdlib>  // std::abs | 
| 8 | 8 | 
| 9 #include "net/quic/core/quic_flags.h" |  | 
| 10 |  | 
| 11 |  | 
| 12 namespace net { | 9 namespace net { | 
| 13 | 10 | 
| 14 namespace { | 11 namespace { | 
| 15 | 12 | 
| 16 // Default initial rtt used before any samples are received. | 13 // Default initial rtt used before any samples are received. | 
| 17 const int kInitialRttMs = 100; | 14 const int kInitialRttMs = 100; | 
| 18 const float kAlpha = 0.125f; | 15 const float kAlpha = 0.125f; | 
| 19 const float kOneMinusAlpha = (1 - kAlpha); | 16 const float kOneMinusAlpha = (1 - kAlpha); | 
| 20 const float kBeta = 0.25f; | 17 const float kBeta = 0.25f; | 
| 21 const float kOneMinusBeta = (1 - kBeta); | 18 const float kOneMinusBeta = (1 - kBeta); | 
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| 83 | 80 | 
| 84 void RttStats::OnConnectionMigration() { | 81 void RttStats::OnConnectionMigration() { | 
| 85   latest_rtt_ = QuicTime::Delta::Zero(); | 82   latest_rtt_ = QuicTime::Delta::Zero(); | 
| 86   min_rtt_ = QuicTime::Delta::Zero(); | 83   min_rtt_ = QuicTime::Delta::Zero(); | 
| 87   smoothed_rtt_ = QuicTime::Delta::Zero(); | 84   smoothed_rtt_ = QuicTime::Delta::Zero(); | 
| 88   mean_deviation_ = QuicTime::Delta::Zero(); | 85   mean_deviation_ = QuicTime::Delta::Zero(); | 
| 89   initial_rtt_us_ = kInitialRttMs * kNumMicrosPerMilli; | 86   initial_rtt_us_ = kInitialRttMs * kNumMicrosPerMilli; | 
| 90 } | 87 } | 
| 91 | 88 | 
| 92 }  // namespace net | 89 }  // namespace net | 
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