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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/fix_rate_sender.h" | 5 #include "net/quic/congestion_control/fix_rate_sender.h" |
6 | 6 |
7 #include <math.h> | 7 #include <math.h> |
8 | 8 |
9 #include <algorithm> | 9 #include <algorithm> |
10 | 10 |
11 #include "base/logging.h" | 11 #include "base/logging.h" |
12 #include "net/quic/quic_protocol.h" | 12 #include "net/quic/quic_protocol.h" |
13 | 13 |
| 14 using std::max; |
| 15 |
14 namespace { | 16 namespace { |
15 const int kInitialBitrate = 100000; // In bytes per second. | 17 const int kInitialBitrate = 100000; // In bytes per second. |
16 const uint64 kWindowSizeUs = 10000; // 10 ms. | 18 const uint64 kWindowSizeUs = 10000; // 10 ms. |
17 } | 19 } |
18 | 20 |
19 namespace net { | 21 namespace net { |
20 | 22 |
21 FixRateSender::FixRateSender(const QuicClock* clock) | 23 FixRateSender::FixRateSender(const QuicClock* clock) |
22 : bitrate_(QuicBandwidth::FromBytesPerSecond(kInitialBitrate)), | 24 : bitrate_(QuicBandwidth::FromBytesPerSecond(kInitialBitrate)), |
23 max_segment_size_(kDefaultMaxPacketSize), | 25 max_segment_size_(kDefaultMaxPacketSize), |
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111 // We need an ack before we send more. | 113 // We need an ack before we send more. |
112 return QuicTime::Delta::Infinite(); | 114 return QuicTime::Delta::Infinite(); |
113 } | 115 } |
114 return paced_sender_.TimeUntilSend(now, time_remaining); | 116 return paced_sender_.TimeUntilSend(now, time_remaining); |
115 } | 117 } |
116 | 118 |
117 QuicByteCount FixRateSender::CongestionWindow() { | 119 QuicByteCount FixRateSender::CongestionWindow() { |
118 QuicByteCount window_size_bytes = bitrate_.ToBytesPerPeriod( | 120 QuicByteCount window_size_bytes = bitrate_.ToBytesPerPeriod( |
119 QuicTime::Delta::FromMicroseconds(kWindowSizeUs)); | 121 QuicTime::Delta::FromMicroseconds(kWindowSizeUs)); |
120 // Make sure window size is not less than a packet. | 122 // Make sure window size is not less than a packet. |
121 return std::max(kDefaultMaxPacketSize, window_size_bytes); | 123 return max(kDefaultMaxPacketSize, window_size_bytes); |
122 } | 124 } |
123 | 125 |
124 QuicBandwidth FixRateSender::BandwidthEstimate() const { | 126 QuicBandwidth FixRateSender::BandwidthEstimate() const { |
125 return bitrate_; | 127 return bitrate_; |
126 } | 128 } |
127 | 129 |
128 QuicTime::Delta FixRateSender::SmoothedRtt() const { | 130 QuicTime::Delta FixRateSender::SmoothedRtt() const { |
129 // TODO(satyamshekhar): Calculate and return smoothed rtt. | 131 // TODO(satyamshekhar): Calculate and return smoothed rtt. |
130 return latest_rtt_; | 132 return latest_rtt_; |
131 } | 133 } |
132 | 134 |
133 QuicTime::Delta FixRateSender::RetransmissionDelay() const { | 135 QuicTime::Delta FixRateSender::RetransmissionDelay() const { |
134 // TODO(pwestin): Calculate and return retransmission delay. | 136 // TODO(pwestin): Calculate and return retransmission delay. |
135 // Use 2 * the latest RTT for now. | 137 // Use 2 * the latest RTT for now. |
136 return latest_rtt_.Add(latest_rtt_); | 138 return latest_rtt_.Add(latest_rtt_); |
137 } | 139 } |
138 | 140 |
139 QuicByteCount FixRateSender::GetCongestionWindow() const { | 141 QuicByteCount FixRateSender::GetCongestionWindow() const { |
140 return 0; | 142 return 0; |
141 } | 143 } |
142 | 144 |
143 } // namespace net | 145 } // namespace net |
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