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| 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2013 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/pacing_sender.h" | 5 #include "net/quic/core/congestion_control/pacing_sender.h" |
| 6 | 6 |
| 7 #include "net/quic/platform/api/quic_logging.h" |
| 8 |
| 7 namespace net { | 9 namespace net { |
| 8 namespace { | 10 namespace { |
| 9 | 11 |
| 10 // The estimated system alarm granularity. | 12 // The estimated system alarm granularity. |
| 11 static const QuicTime::Delta kAlarmGranularity = | 13 static const QuicTime::Delta kAlarmGranularity = |
| 12 QuicTime::Delta::FromMilliseconds(1); | 14 QuicTime::Delta::FromMilliseconds(1); |
| 13 | 15 |
| 14 // Configured maximum size of the burst coming out of quiescence. The burst | 16 // Configured maximum size of the burst coming out of quiescence. The burst |
| 15 // is never larger than the current CWND in packets. | 17 // is never larger than the current CWND in packets. |
| 16 static const uint32_t kInitialUnpacedBurst = 10; | 18 static const uint32_t kInitialUnpacedBurst = 10; |
| (...skipping 102 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
| 119 } | 121 } |
| 120 | 122 |
| 121 if (!time_until_send.IsZero()) { | 123 if (!time_until_send.IsZero()) { |
| 122 DCHECK(time_until_send.IsInfinite()); | 124 DCHECK(time_until_send.IsInfinite()); |
| 123 // The underlying sender prevents sending. | 125 // The underlying sender prevents sending. |
| 124 return time_until_send; | 126 return time_until_send; |
| 125 } | 127 } |
| 126 | 128 |
| 127 // If the next send time is within the alarm granularity, send immediately. | 129 // If the next send time is within the alarm granularity, send immediately. |
| 128 if (ideal_next_packet_send_time_ > now + kAlarmGranularity) { | 130 if (ideal_next_packet_send_time_ > now + kAlarmGranularity) { |
| 129 DVLOG(1) << "Delaying packet: " | 131 QUIC_DVLOG(1) << "Delaying packet: " |
| 130 << (ideal_next_packet_send_time_ - now).ToMicroseconds(); | 132 << (ideal_next_packet_send_time_ - now).ToMicroseconds(); |
| 131 was_last_send_delayed_ = true; | 133 was_last_send_delayed_ = true; |
| 132 return ideal_next_packet_send_time_ - now; | 134 return ideal_next_packet_send_time_ - now; |
| 133 } | 135 } |
| 134 | 136 |
| 135 DVLOG(1) << "Sending packet now"; | 137 QUIC_DVLOG(1) << "Sending packet now"; |
| 136 return QuicTime::Delta::Zero(); | 138 return QuicTime::Delta::Zero(); |
| 137 } | 139 } |
| 138 | 140 |
| 139 QuicBandwidth PacingSender::PacingRate(QuicByteCount bytes_in_flight) const { | 141 QuicBandwidth PacingSender::PacingRate(QuicByteCount bytes_in_flight) const { |
| 140 DCHECK(sender_ != nullptr); | 142 DCHECK(sender_ != nullptr); |
| 141 if (!max_pacing_rate_.IsZero()) { | 143 if (!max_pacing_rate_.IsZero()) { |
| 142 return QuicBandwidth::FromBitsPerSecond( | 144 return QuicBandwidth::FromBitsPerSecond( |
| 143 std::min(max_pacing_rate_.ToBitsPerSecond(), | 145 std::min(max_pacing_rate_.ToBitsPerSecond(), |
| 144 sender_->PacingRate(bytes_in_flight).ToBitsPerSecond())); | 146 sender_->PacingRate(bytes_in_flight).ToBitsPerSecond())); |
| 145 } | 147 } |
| 146 return sender_->PacingRate(bytes_in_flight); | 148 return sender_->PacingRate(bytes_in_flight); |
| 147 } | 149 } |
| 148 | 150 |
| 149 } // namespace net | 151 } // namespace net |
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