| QUICHE team | a6ef0a6 | 2019-03-07 20:34:33 -0500 | [diff] [blame] | 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 |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "net/third_party/quiche/src/quic/core/quic_sustained_bandwidth_recorder.h" |
| 6 | |
| 7 | #include "net/third_party/quiche/src/quic/core/quic_bandwidth.h" |
| 8 | #include "net/third_party/quiche/src/quic/core/quic_time.h" |
| 9 | #include "net/third_party/quiche/src/quic/platform/api/quic_logging.h" |
| 10 | |
| 11 | namespace quic { |
| 12 | |
| 13 | QuicSustainedBandwidthRecorder::QuicSustainedBandwidthRecorder() |
| 14 | : has_estimate_(false), |
| 15 | is_recording_(false), |
| 16 | bandwidth_estimate_recorded_during_slow_start_(false), |
| 17 | bandwidth_estimate_(QuicBandwidth::Zero()), |
| 18 | max_bandwidth_estimate_(QuicBandwidth::Zero()), |
| 19 | max_bandwidth_timestamp_(0), |
| 20 | start_time_(QuicTime::Zero()) {} |
| 21 | |
| 22 | void QuicSustainedBandwidthRecorder::RecordEstimate(bool in_recovery, |
| 23 | bool in_slow_start, |
| 24 | QuicBandwidth bandwidth, |
| 25 | QuicTime estimate_time, |
| 26 | QuicWallTime wall_time, |
| 27 | QuicTime::Delta srtt) { |
| 28 | if (in_recovery) { |
| 29 | is_recording_ = false; |
| 30 | QUIC_DVLOG(1) << "Stopped recording at: " |
| 31 | << estimate_time.ToDebuggingValue(); |
| 32 | return; |
| 33 | } |
| 34 | |
| 35 | if (!is_recording_) { |
| 36 | // This is the first estimate of a new recording period. |
| 37 | start_time_ = estimate_time; |
| 38 | is_recording_ = true; |
| 39 | QUIC_DVLOG(1) << "Started recording at: " << start_time_.ToDebuggingValue(); |
| 40 | return; |
| 41 | } |
| 42 | |
| 43 | // If we have been recording for at least 3 * srtt, then record the latest |
| 44 | // bandwidth estimate as a valid sustained bandwidth estimate. |
| 45 | if (estimate_time - start_time_ >= 3 * srtt) { |
| 46 | has_estimate_ = true; |
| 47 | bandwidth_estimate_recorded_during_slow_start_ = in_slow_start; |
| 48 | bandwidth_estimate_ = bandwidth; |
| 49 | QUIC_DVLOG(1) << "New sustained bandwidth estimate (KBytes/s): " |
| 50 | << bandwidth_estimate_.ToKBytesPerSecond(); |
| 51 | } |
| 52 | |
| 53 | // Check for an increase in max bandwidth. |
| 54 | if (bandwidth > max_bandwidth_estimate_) { |
| 55 | max_bandwidth_estimate_ = bandwidth; |
| 56 | max_bandwidth_timestamp_ = wall_time.ToUNIXSeconds(); |
| 57 | QUIC_DVLOG(1) << "New max bandwidth estimate (KBytes/s): " |
| 58 | << max_bandwidth_estimate_.ToKBytesPerSecond(); |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | } // namespace quic |
