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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 // A convenience class to store rtt samples and calculate smoothed rtt. | 5 // A convenience class to store rtt samples and calculate smoothed rtt. |
| 6 | 6 |
| 7 #ifndef NET_QUIC_CORE_CONGESTION_CONTROL_RTT_STATS_H_ | 7 #ifndef NET_QUIC_CORE_CONGESTION_CONTROL_RTT_STATS_H_ |
| 8 #define NET_QUIC_CORE_CONGESTION_CONTROL_RTT_STATS_H_ | 8 #define NET_QUIC_CORE_CONGESTION_CONTROL_RTT_STATS_H_ |
| 9 | 9 |
| 10 #include <stdint.h> | 10 #include <stdint.h> |
| 11 | 11 |
| 12 #include <algorithm> | 12 #include <algorithm> |
| 13 | 13 |
| 14 #include "base/macros.h" | 14 #include "base/macros.h" |
| 15 #include "net/base/net_export.h" | |
| 16 #include "net/quic/core/quic_bug_tracker.h" | 15 #include "net/quic/core/quic_bug_tracker.h" |
| 17 #include "net/quic/core/quic_packets.h" | 16 #include "net/quic/core/quic_packets.h" |
| 18 #include "net/quic/core/quic_time.h" | 17 #include "net/quic/core/quic_time.h" |
| 18 #include "net/quic/platform/api/quic_export.h" |
| 19 | 19 |
| 20 namespace net { | 20 namespace net { |
| 21 | 21 |
| 22 namespace test { | 22 namespace test { |
| 23 class RttStatsPeer; | 23 class RttStatsPeer; |
| 24 } // namespace test | 24 } // namespace test |
| 25 | 25 |
| 26 class NET_EXPORT_PRIVATE RttStats { | 26 class QUIC_EXPORT_PRIVATE RttStats { |
| 27 public: | 27 public: |
| 28 RttStats(); | 28 RttStats(); |
| 29 | 29 |
| 30 // Updates the RTT from an incoming ack which is received |send_delta| after | 30 // Updates the RTT from an incoming ack which is received |send_delta| after |
| 31 // the packet is sent and the peer reports the ack being delayed |ack_delay|. | 31 // the packet is sent and the peer reports the ack being delayed |ack_delay|. |
| 32 void UpdateRtt(QuicTime::Delta send_delta, | 32 void UpdateRtt(QuicTime::Delta send_delta, |
| 33 QuicTime::Delta ack_delay, | 33 QuicTime::Delta ack_delay, |
| 34 QuicTime now); | 34 QuicTime now); |
| 35 | 35 |
| 36 // Causes the smoothed_rtt to be increased to the latest_rtt if the latest_rtt | 36 // Causes the smoothed_rtt to be increased to the latest_rtt if the latest_rtt |
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| 81 // larger than the standard deviation, for a normally distributed signal. | 81 // larger than the standard deviation, for a normally distributed signal. |
| 82 QuicTime::Delta mean_deviation_; | 82 QuicTime::Delta mean_deviation_; |
| 83 int64_t initial_rtt_us_; | 83 int64_t initial_rtt_us_; |
| 84 | 84 |
| 85 DISALLOW_COPY_AND_ASSIGN(RttStats); | 85 DISALLOW_COPY_AND_ASSIGN(RttStats); |
| 86 }; | 86 }; |
| 87 | 87 |
| 88 } // namespace net | 88 } // namespace net |
| 89 | 89 |
| 90 #endif // NET_QUIC_CORE_CONGESTION_CONTROL_RTT_STATS_H_ | 90 #endif // NET_QUIC_CORE_CONGESTION_CONTROL_RTT_STATS_H_ |
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