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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/congestion_control/tcp_cubic_sender.h" | 5 #include "net/quic/congestion_control/tcp_cubic_sender.h" |
| 6 | 6 |
| 7 #include <algorithm> | 7 #include <algorithm> |
| 8 | 8 |
| 9 #include "base/metrics/histogram.h" | 9 #include "base/metrics/histogram.h" |
| 10 | 10 |
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| 233 | 233 |
| 234 QuicTime::Delta TcpCubicSender::RetransmissionDelay() const { | 234 QuicTime::Delta TcpCubicSender::RetransmissionDelay() const { |
| 235 return QuicTime::Delta::FromMicroseconds( | 235 return QuicTime::Delta::FromMicroseconds( |
| 236 smoothed_rtt_.ToMicroseconds() + 4 * mean_deviation_.ToMicroseconds()); | 236 smoothed_rtt_.ToMicroseconds() + 4 * mean_deviation_.ToMicroseconds()); |
| 237 } | 237 } |
| 238 | 238 |
| 239 QuicByteCount TcpCubicSender::GetCongestionWindow() const { | 239 QuicByteCount TcpCubicSender::GetCongestionWindow() const { |
| 240 return congestion_window_ * kMaxSegmentSize; | 240 return congestion_window_ * kMaxSegmentSize; |
| 241 } | 241 } |
| 242 | 242 |
| 243 void TcpCubicSender::Reset() { | |
| 244 delay_min_ = QuicTime::Delta::Zero(); | |
| 245 hybrid_slow_start_.Restart(); | |
| 246 } | |
| 247 | |
| 248 bool TcpCubicSender::IsCwndLimited() const { | 243 bool TcpCubicSender::IsCwndLimited() const { |
| 249 const QuicByteCount congestion_window_bytes = congestion_window_ * | 244 const QuicByteCount congestion_window_bytes = congestion_window_ * |
| 250 kMaxSegmentSize; | 245 kMaxSegmentSize; |
| 251 if (bytes_in_flight_ >= congestion_window_bytes) { | 246 if (bytes_in_flight_ >= congestion_window_bytes) { |
| 252 return true; | 247 return true; |
| 253 } | 248 } |
| 254 const QuicByteCount tcp_max_burst = kMaxBurstLength * kMaxSegmentSize; | 249 const QuicByteCount tcp_max_burst = kMaxBurstLength * kMaxSegmentSize; |
| 255 const QuicByteCount left = congestion_window_bytes - bytes_in_flight_; | 250 const QuicByteCount left = congestion_window_bytes - bytes_in_flight_; |
| 256 return left <= tcp_max_burst; | 251 return left <= tcp_max_burst; |
| 257 } | 252 } |
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| 363 hybrid_slow_start_.Reset(end_sequence_number_); | 358 hybrid_slow_start_.Reset(end_sequence_number_); |
| 364 } | 359 } |
| 365 hybrid_slow_start_.Update(rtt, delay_min_); | 360 hybrid_slow_start_.Update(rtt, delay_min_); |
| 366 if (hybrid_slow_start_.Exit()) { | 361 if (hybrid_slow_start_.Exit()) { |
| 367 slowstart_threshold_ = congestion_window_; | 362 slowstart_threshold_ = congestion_window_; |
| 368 } | 363 } |
| 369 } | 364 } |
| 370 } | 365 } |
| 371 | 366 |
| 372 } // namespace net | 367 } // namespace net |
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