3168781d2f
This is a simple application limited region detector that is quite conservative at the moment. We detect as being application-limited if we see sending rate as less than 30% of the estimated bandwidth over 500 ms. The moment we detect a single burst above 30% over a 100 ms period, we consider ourselves network limited. This class is currently not used. A follow up CL will leverage this to enable probing. BUG=webrtc:6332 Review-Url: https://codereview.webrtc.org/2340763004 Cr-Commit-Position: refs/heads/master@{#14505}
81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
/*
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* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/modules/pacing/alr_detector.h"
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#include "webrtc/base/checks.h"
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#include "webrtc/base/logging.h"
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namespace {
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// Time period over which outgoing traffic is measured and considered a single
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// data point.
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constexpr int kMeasurementPeriodMs = 100;
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// Minimum number of consecutive measurements over |kMeasurementPeriodMs| time
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// that indicate sending rate is below |kUsagePercent| to consider being
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// application limited.
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constexpr int kApplicationLimitedThreshold = 5;
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// Sent traffic percentage as a function of network capaicty to consider traffic
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// as application limited.
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// NOTE: This is intentionally conservative at the moment until BW adjustments
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// of application limited region is fine tuned.
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constexpr int kUsagePercent = 30;
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} // namespace
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namespace webrtc {
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AlrDetector::AlrDetector()
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: measurement_interval_bytes_sent_(0),
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measurement_interval_elapsed_time_ms_(0),
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estimated_bitrate_bps_(0),
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application_limited_count_(0) {}
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AlrDetector::~AlrDetector() {}
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void AlrDetector::OnBytesSent(size_t bytes_sent, int64_t elapsed_time_ms) {
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if (measurement_interval_elapsed_time_ms_ > kMeasurementPeriodMs) {
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RTC_DCHECK(estimated_bitrate_bps_);
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int max_bytes =
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(measurement_interval_elapsed_time_ms_ * estimated_bitrate_bps_) /
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(8 * 1000);
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RTC_DCHECK_GT(max_bytes, 0);
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int utilization =
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static_cast<int>((measurement_interval_bytes_sent_ * 100) / max_bytes);
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if (utilization < kUsagePercent) {
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application_limited_count_++;
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if (application_limited_count_ == kApplicationLimitedThreshold)
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LOG(LS_INFO) << "ALR start";
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} else {
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if (application_limited_count_ >= kApplicationLimitedThreshold)
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LOG(LS_INFO) << "ALR stop";
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application_limited_count_ = 0;
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}
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measurement_interval_elapsed_time_ms_ = elapsed_time_ms;
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measurement_interval_bytes_sent_ = bytes_sent;
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} else {
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measurement_interval_elapsed_time_ms_ += elapsed_time_ms;
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measurement_interval_bytes_sent_ += bytes_sent;
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}
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}
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void AlrDetector::SetEstimatedBitrate(int bitrate_bps) {
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RTC_DCHECK(bitrate_bps);
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estimated_bitrate_bps_ = bitrate_bps;
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}
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bool AlrDetector::InApplicationLimitedRegion() {
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return application_limited_count_ >= kApplicationLimitedThreshold;
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}
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} // namespace webrtc
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