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Side by Side Diff: net/quic/core/congestion_control/rtt_stats.cc

Issue 2629723003: Revert of Add quic_logging (Closed)
Patch Set: Created 3 years, 11 months ago
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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 #include "net/quic/core/congestion_control/rtt_stats.h" 5 #include "net/quic/core/congestion_control/rtt_stats.h"
6 6
7 #include <cstdlib> // std::abs 7 #include <cstdlib> // std::abs
8 8
9 #include "net/quic/platform/api/quic_logging.h"
10
11 namespace net { 9 namespace net {
12 10
13 namespace { 11 namespace {
14 12
15 // Default initial rtt used before any samples are received. 13 // Default initial rtt used before any samples are received.
16 const int kInitialRttMs = 100; 14 const int kInitialRttMs = 100;
17 const float kAlpha = 0.125f; 15 const float kAlpha = 0.125f;
18 const float kOneMinusAlpha = (1 - kAlpha); 16 const float kOneMinusAlpha = (1 - kAlpha);
19 const float kBeta = 0.25f; 17 const float kBeta = 0.25f;
20 const float kOneMinusBeta = (1 - kBeta); 18 const float kOneMinusBeta = (1 - kBeta);
(...skipping 13 matching lines...) Expand all
34 mean_deviation_, QuicTime::Delta::FromMicroseconds(std::abs( 32 mean_deviation_, QuicTime::Delta::FromMicroseconds(std::abs(
35 (smoothed_rtt_ - latest_rtt_).ToMicroseconds()))); 33 (smoothed_rtt_ - latest_rtt_).ToMicroseconds())));
36 smoothed_rtt_ = std::max(smoothed_rtt_, latest_rtt_); 34 smoothed_rtt_ = std::max(smoothed_rtt_, latest_rtt_);
37 } 35 }
38 36
39 // Updates the RTT based on a new sample. 37 // Updates the RTT based on a new sample.
40 void RttStats::UpdateRtt(QuicTime::Delta send_delta, 38 void RttStats::UpdateRtt(QuicTime::Delta send_delta,
41 QuicTime::Delta ack_delay, 39 QuicTime::Delta ack_delay,
42 QuicTime now) { 40 QuicTime now) {
43 if (send_delta.IsInfinite() || send_delta <= QuicTime::Delta::Zero()) { 41 if (send_delta.IsInfinite() || send_delta <= QuicTime::Delta::Zero()) {
44 QUIC_LOG_FIRST_N(WARNING, 3) 42 LOG(WARNING) << "Ignoring measured send_delta, because it's is "
45 << "Ignoring measured send_delta, because it's is " 43 << "either infinite, zero, or negative. send_delta = "
46 << "either infinite, zero, or negative. send_delta = " 44 << send_delta.ToMicroseconds();
47 << send_delta.ToMicroseconds();
48 return; 45 return;
49 } 46 }
50 47
51 // Update min_rtt_ first. min_rtt_ does not use an rtt_sample corrected for 48 // Update min_rtt_ first. min_rtt_ does not use an rtt_sample corrected for
52 // ack_delay but the raw observed send_delta, since poor clock granularity at 49 // ack_delay but the raw observed send_delta, since poor clock granularity at
53 // the client may cause a high ack_delay to result in underestimation of the 50 // the client may cause a high ack_delay to result in underestimation of the
54 // min_rtt_. 51 // min_rtt_.
55 if (min_rtt_.IsZero() || min_rtt_ > send_delta) { 52 if (min_rtt_.IsZero() || min_rtt_ > send_delta) {
56 min_rtt_ = send_delta; 53 min_rtt_ = send_delta;
57 } 54 }
(...skipping 11 matching lines...) Expand all
69 // First time call. 66 // First time call.
70 if (smoothed_rtt_.IsZero()) { 67 if (smoothed_rtt_.IsZero()) {
71 smoothed_rtt_ = rtt_sample; 68 smoothed_rtt_ = rtt_sample;
72 mean_deviation_ = 69 mean_deviation_ =
73 QuicTime::Delta::FromMicroseconds(rtt_sample.ToMicroseconds() / 2); 70 QuicTime::Delta::FromMicroseconds(rtt_sample.ToMicroseconds() / 2);
74 } else { 71 } else {
75 mean_deviation_ = QuicTime::Delta::FromMicroseconds(static_cast<int64_t>( 72 mean_deviation_ = QuicTime::Delta::FromMicroseconds(static_cast<int64_t>(
76 kOneMinusBeta * mean_deviation_.ToMicroseconds() + 73 kOneMinusBeta * mean_deviation_.ToMicroseconds() +
77 kBeta * std::abs((smoothed_rtt_ - rtt_sample).ToMicroseconds()))); 74 kBeta * std::abs((smoothed_rtt_ - rtt_sample).ToMicroseconds())));
78 smoothed_rtt_ = kOneMinusAlpha * smoothed_rtt_ + kAlpha * rtt_sample; 75 smoothed_rtt_ = kOneMinusAlpha * smoothed_rtt_ + kAlpha * rtt_sample;
79 QUIC_DVLOG(1) << " smoothed_rtt(us):" << smoothed_rtt_.ToMicroseconds() 76 DVLOG(1) << " smoothed_rtt(us):" << smoothed_rtt_.ToMicroseconds()
80 << " mean_deviation(us):" << mean_deviation_.ToMicroseconds(); 77 << " mean_deviation(us):" << mean_deviation_.ToMicroseconds();
81 } 78 }
82 } 79 }
83 80
84 void RttStats::OnConnectionMigration() { 81 void RttStats::OnConnectionMigration() {
85 latest_rtt_ = QuicTime::Delta::Zero(); 82 latest_rtt_ = QuicTime::Delta::Zero();
86 min_rtt_ = QuicTime::Delta::Zero(); 83 min_rtt_ = QuicTime::Delta::Zero();
87 smoothed_rtt_ = QuicTime::Delta::Zero(); 84 smoothed_rtt_ = QuicTime::Delta::Zero();
88 mean_deviation_ = QuicTime::Delta::Zero(); 85 mean_deviation_ = QuicTime::Delta::Zero();
89 initial_rtt_us_ = kInitialRttMs * kNumMicrosPerMilli; 86 initial_rtt_us_ = kInitialRttMs * kNumMicrosPerMilli;
90 } 87 }
91 88
92 } // namespace net 89 } // namespace net
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