5528402ef8
This change generated with following commands: find modules -type f \( -name "*.h" -o -name "*.cc" \) | xargs sed -i -e "s/TimeDelta::Micros<\(.*\)>()/TimeDelta::Micros(\1)/g" find modules -type f \( -name "*.h" -o -name "*.cc" \) | xargs sed -i -e "s/TimeDelta::Millis<\(.*\)>()/TimeDelta::Millis(\1)/g" find modules -type f \( -name "*.h" -o -name "*.cc" \) | xargs sed -i -e "s/TimeDelta::Seconds<\(.*\)>()/TimeDelta::Seconds(\1)/g" find modules -type f \( -name "*.h" -o -name "*.cc" \) | xargs sed -i -e "s/TimeDelta::us/TimeDelta::Micros/g" find modules -type f \( -name "*.h" -o -name "*.cc" \) | xargs sed -i -e "s/TimeDelta::ms/TimeDelta::Millis/g" find modules -type f \( -name "*.h" -o -name "*.cc" \) | xargs sed -i -e "s/TimeDelta::seconds/TimeDelta::Seconds/g" find modules -type f \( -name "*.h" -o -name "*.cc" \) | xargs sed -i -e "s/Timestamp::Micros<\(.*\)>()/Timestamp::Micros(\1)/g" find modules -type f \( -name "*.h" -o -name "*.cc" \) | xargs sed -i -e "s/Timestamp::Millis<\(.*\)>()/Timestamp::Millis(\1)/g" find modules -type f \( -name "*.h" -o -name "*.cc" \) | xargs sed -i -e "s/Timestamp::Seconds<\(.*\)>()/Timestamp::Seconds(\1)/g" find modules -type f \( -name "*.h" -o -name "*.cc" \) | xargs sed -i -e "s/Timestamp::us/Timestamp::Micros/g" find modules -type f \( -name "*.h" -o -name "*.cc" \) | xargs sed -i -e "s/Timestamp::ms/Timestamp::Millis/g" find modules -type f \( -name "*.h" -o -name "*.cc" \) | xargs sed -i -e "s/Timestamp::seconds/Timestamp::Seconds/g" git cl format Bug: None Change-Id: I117d64a54950be040d996035c54bc0043310943a Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168340 Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30489}
168 lines
6.9 KiB
C++
168 lines
6.9 KiB
C++
/*
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* Copyright (c) 2018 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 "modules/congestion_controller/bbr/rtt_stats.h"
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#include <stdlib.h>
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#include <cmath>
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#include <vector>
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#include "test/gtest.h"
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namespace webrtc {
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namespace bbr {
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namespace test {
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class RttStatsTest : public ::testing::Test {
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protected:
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RttStats rtt_stats_;
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};
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TEST_F(RttStatsTest, DefaultsBeforeUpdate) {
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EXPECT_LT(0u, rtt_stats_.initial_rtt_us());
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EXPECT_EQ(TimeDelta::Zero(), rtt_stats_.min_rtt());
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EXPECT_EQ(TimeDelta::Zero(), rtt_stats_.smoothed_rtt());
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}
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TEST_F(RttStatsTest, SmoothedRtt) {
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// Verify that ack_delay is corrected for in Smoothed RTT.
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rtt_stats_.UpdateRtt(TimeDelta::Millis(300), TimeDelta::Millis(100),
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Timestamp::Millis(0));
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EXPECT_EQ(TimeDelta::Millis(200), rtt_stats_.latest_rtt());
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EXPECT_EQ(TimeDelta::Millis(200), rtt_stats_.smoothed_rtt());
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// Verify that effective RTT of zero does not change Smoothed RTT.
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rtt_stats_.UpdateRtt(TimeDelta::Millis(200), TimeDelta::Millis(200),
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Timestamp::Millis(0));
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EXPECT_EQ(TimeDelta::Millis(200), rtt_stats_.latest_rtt());
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EXPECT_EQ(TimeDelta::Millis(200), rtt_stats_.smoothed_rtt());
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// Verify that large erroneous ack_delay does not change Smoothed RTT.
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rtt_stats_.UpdateRtt(TimeDelta::Millis(200), TimeDelta::Millis(300),
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Timestamp::Millis(0));
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EXPECT_EQ(TimeDelta::Millis(200), rtt_stats_.latest_rtt());
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EXPECT_EQ(TimeDelta::Millis(200), rtt_stats_.smoothed_rtt());
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}
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// Ensure that the potential rounding artifacts in EWMA calculation do not cause
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// the SRTT to drift too far from the exact value.
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TEST_F(RttStatsTest, SmoothedRttStability) {
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for (int64_t time = 3; time < 20000; time++) {
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RttStats stats;
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for (int64_t i = 0; i < 100; i++) {
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stats.UpdateRtt(TimeDelta::Micros(time), TimeDelta::Millis(0),
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Timestamp::Millis(0));
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int64_t time_delta_us = stats.smoothed_rtt().us() - time;
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ASSERT_LE(std::abs(time_delta_us), 1);
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}
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}
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}
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TEST_F(RttStatsTest, PreviousSmoothedRtt) {
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// Verify that ack_delay is corrected for in Smoothed RTT.
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rtt_stats_.UpdateRtt(TimeDelta::Millis(300), TimeDelta::Millis(100),
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Timestamp::Millis(0));
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EXPECT_EQ(TimeDelta::Millis(200), rtt_stats_.latest_rtt());
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EXPECT_EQ(TimeDelta::Millis(200), rtt_stats_.smoothed_rtt());
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EXPECT_EQ(TimeDelta::Zero(), rtt_stats_.previous_srtt());
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// Ensure the previous SRTT is 200ms after a 100ms sample.
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rtt_stats_.UpdateRtt(TimeDelta::Millis(100), TimeDelta::Zero(),
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Timestamp::Millis(0));
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EXPECT_EQ(TimeDelta::Millis(100), rtt_stats_.latest_rtt());
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EXPECT_EQ(TimeDelta::Micros(187500).us(), rtt_stats_.smoothed_rtt().us());
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EXPECT_EQ(TimeDelta::Millis(200), rtt_stats_.previous_srtt());
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}
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TEST_F(RttStatsTest, MinRtt) {
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rtt_stats_.UpdateRtt(TimeDelta::Millis(200), TimeDelta::Zero(),
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Timestamp::Millis(0));
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EXPECT_EQ(TimeDelta::Millis(200), rtt_stats_.min_rtt());
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rtt_stats_.UpdateRtt(TimeDelta::Millis(10), TimeDelta::Zero(),
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Timestamp::Millis(0) + TimeDelta::Millis(10));
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EXPECT_EQ(TimeDelta::Millis(10), rtt_stats_.min_rtt());
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rtt_stats_.UpdateRtt(TimeDelta::Millis(50), TimeDelta::Zero(),
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Timestamp::Millis(0) + TimeDelta::Millis(20));
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EXPECT_EQ(TimeDelta::Millis(10), rtt_stats_.min_rtt());
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rtt_stats_.UpdateRtt(TimeDelta::Millis(50), TimeDelta::Zero(),
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Timestamp::Millis(0) + TimeDelta::Millis(30));
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EXPECT_EQ(TimeDelta::Millis(10), rtt_stats_.min_rtt());
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rtt_stats_.UpdateRtt(TimeDelta::Millis(50), TimeDelta::Zero(),
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Timestamp::Millis(0) + TimeDelta::Millis(40));
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EXPECT_EQ(TimeDelta::Millis(10), rtt_stats_.min_rtt());
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// Verify that ack_delay does not go into recording of min_rtt_.
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rtt_stats_.UpdateRtt(TimeDelta::Millis(7), TimeDelta::Millis(2),
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Timestamp::Millis(0) + TimeDelta::Millis(50));
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EXPECT_EQ(TimeDelta::Millis(7), rtt_stats_.min_rtt());
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}
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TEST_F(RttStatsTest, ExpireSmoothedMetrics) {
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TimeDelta initial_rtt = TimeDelta::Millis(10);
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rtt_stats_.UpdateRtt(initial_rtt, TimeDelta::Zero(), Timestamp::Millis(0));
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EXPECT_EQ(initial_rtt, rtt_stats_.min_rtt());
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EXPECT_EQ(initial_rtt, rtt_stats_.smoothed_rtt());
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EXPECT_EQ(0.5 * initial_rtt, rtt_stats_.mean_deviation());
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// Update once with a 20ms RTT.
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TimeDelta doubled_rtt = 2 * initial_rtt;
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rtt_stats_.UpdateRtt(doubled_rtt, TimeDelta::Zero(), Timestamp::Millis(0));
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EXPECT_EQ(1.125 * initial_rtt, rtt_stats_.smoothed_rtt());
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// Expire the smoothed metrics, increasing smoothed rtt and mean deviation.
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rtt_stats_.ExpireSmoothedMetrics();
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EXPECT_EQ(doubled_rtt, rtt_stats_.smoothed_rtt());
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EXPECT_EQ(0.875 * initial_rtt, rtt_stats_.mean_deviation());
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// Now go back down to 5ms and expire the smoothed metrics, and ensure the
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// mean deviation increases to 15ms.
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TimeDelta half_rtt = 0.5 * initial_rtt;
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rtt_stats_.UpdateRtt(half_rtt, TimeDelta::Zero(), Timestamp::Millis(0));
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EXPECT_GT(doubled_rtt, rtt_stats_.smoothed_rtt());
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EXPECT_LT(initial_rtt, rtt_stats_.mean_deviation());
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}
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TEST_F(RttStatsTest, UpdateRttWithBadSendDeltas) {
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// Make sure we ignore bad RTTs.
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TimeDelta initial_rtt = TimeDelta::Millis(10);
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rtt_stats_.UpdateRtt(initial_rtt, TimeDelta::Zero(), Timestamp::Millis(0));
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EXPECT_EQ(initial_rtt, rtt_stats_.min_rtt());
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EXPECT_EQ(initial_rtt, rtt_stats_.smoothed_rtt());
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std::vector<TimeDelta> bad_send_deltas;
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bad_send_deltas.push_back(TimeDelta::Zero());
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bad_send_deltas.push_back(TimeDelta::PlusInfinity());
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bad_send_deltas.push_back(TimeDelta::Micros(-1000));
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for (TimeDelta bad_send_delta : bad_send_deltas) {
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rtt_stats_.UpdateRtt(bad_send_delta, TimeDelta::Zero(),
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Timestamp::Millis(0));
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EXPECT_EQ(initial_rtt, rtt_stats_.min_rtt());
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EXPECT_EQ(initial_rtt, rtt_stats_.smoothed_rtt());
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}
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}
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TEST_F(RttStatsTest, ResetAfterConnectionMigrations) {
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rtt_stats_.UpdateRtt(TimeDelta::Millis(300), TimeDelta::Millis(100),
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Timestamp::Millis(0));
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EXPECT_EQ(TimeDelta::Millis(200), rtt_stats_.latest_rtt());
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EXPECT_EQ(TimeDelta::Millis(200), rtt_stats_.smoothed_rtt());
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EXPECT_EQ(TimeDelta::Millis(300), rtt_stats_.min_rtt());
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// Reset rtt stats on connection migrations.
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rtt_stats_.OnConnectionMigration();
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EXPECT_EQ(TimeDelta::Zero(), rtt_stats_.latest_rtt());
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EXPECT_EQ(TimeDelta::Zero(), rtt_stats_.smoothed_rtt());
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EXPECT_EQ(TimeDelta::Zero(), rtt_stats_.min_rtt());
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}
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} // namespace test
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} // namespace bbr
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} // namespace webrtc
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