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Continue probing if networkstat estimate increase

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This fixes an issue where continues probing stops if networkstate estimate is low when a probe is sent, but increase as a consequence of the probe.


Bug: webrtc:14392
Change-Id: Id1d703f7efc824a6a6f8d899c367660291bd88c8
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/282941
Reviewed-by: Diep Bui <diepbp@webrtc.org>
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#38606}
This commit is contained in:
Per Kjellander 2022-11-10 14:39:52 +01:00 committed by WebRTC LUCI CQ
parent 15a82c93d0
commit dd7dc25a30
2 changed files with 58 additions and 15 deletions
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37
modules/congestion_controller/goog_cc/probe_controller.cc
View file

@ -468,25 +468,13 @@ std::vector<ProbeClusterConfig> ProbeController::InitiateProbing(
: std::min(max_total_allocated_bitrate_, max_bitrate_);
if (std::min(network_estimate, estimated_bitrate_) >
config_.skip_if_estimate_larger_than_fraction_of_max * max_probe_rate) {
state_ = State::kProbingComplete;
min_bitrate_to_probe_further_ = DataRate::PlusInfinity();
return {};
}
}
DataRate max_probe_bitrate = max_bitrate_;
if (bwe_limited_due_to_packet_loss_ &&
config_.limit_probe_target_rate_to_loss_bwe) {
max_probe_bitrate = std::min(estimated_bitrate_, max_bitrate_);
}
if (config_.network_state_estimate_probing_interval->IsFinite() &&
network_estimate_ && network_estimate_->link_capacity_upper.IsFinite()) {
if (network_estimate_->link_capacity_upper.IsZero()) {
RTC_LOG(LS_INFO) << "Not sending probe, Network state estimate is zero";
return {};
}
max_probe_bitrate =
std::min(max_probe_bitrate, network_estimate_->link_capacity_upper *
config_.network_state_probe_scale);
}
if (max_total_allocated_bitrate_ > DataRate::Zero()) {
// If a max allocated bitrate has been configured, allow probing up to 2x
// that rate. This allows some overhead to account for bursty streams,
@ -498,10 +486,28 @@ std::vector<ProbeClusterConfig> ProbeController::InitiateProbing(
std::min(max_probe_bitrate, max_total_allocated_bitrate_ * 2);
}
DataRate estimate_capped_bitrate = DataRate::PlusInfinity();
if (bwe_limited_due_to_packet_loss_ &&
config_.limit_probe_target_rate_to_loss_bwe) {
estimate_capped_bitrate = std::min(estimated_bitrate_, max_probe_bitrate);
}
if (config_.network_state_estimate_probing_interval->IsFinite() &&
network_estimate_ && network_estimate_->link_capacity_upper.IsFinite()) {
if (network_estimate_->link_capacity_upper.IsZero()) {
RTC_LOG(LS_INFO) << "Not sending probe, Network state estimate is zero";
return {};
}
estimate_capped_bitrate =
std::min({estimate_capped_bitrate, max_probe_bitrate,
network_estimate_->link_capacity_upper *
config_.network_state_probe_scale});
}
std::vector<ProbeClusterConfig> pending_probes;
for (DataRate bitrate : bitrates_to_probe) {
RTC_DCHECK(!bitrate.IsZero());
bitrate = std::min(bitrate, estimate_capped_bitrate);
if (bitrate > max_probe_bitrate) {
bitrate = max_probe_bitrate;
probe_further = false;
@ -527,7 +533,8 @@ std::vector<ProbeClusterConfig> ProbeController::InitiateProbing(
if (probe_further) {
state_ = State::kWaitingForProbingResult;
min_bitrate_to_probe_further_ =
(*(bitrates_to_probe.end() - 1)) * config_.further_probe_threshold;
std::min(estimate_capped_bitrate, (*(bitrates_to_probe.end() - 1))) *
config_.further_probe_threshold;
} else {
state_ = State::kProbingComplete;
min_bitrate_to_probe_further_ = DataRate::PlusInfinity();

36
modules/congestion_controller/goog_cc/probe_controller_unittest.cc
View file

@ -789,6 +789,42 @@ TEST(ProbeControllerTest, ProbeFurtherWhenDelayBasedLimited) {
EXPECT_EQ(probes[0].target_data_rate, state_estimate.link_capacity_upper);
}
TEST(ProbeControllerTest,
ProbeFurtherIfNetworkStateEstimateIncreaseAfterProbeSent) {
ProbeControllerFixture fixture(
"WebRTC-Bwe-ProbingConfiguration/"
"network_state_interval:5s,limit_probe_target_rate_to_loss_bwe:true/");
std::unique_ptr<ProbeController> probe_controller =
fixture.CreateController();
auto probes = probe_controller->SetBitrates(
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
ASSERT_FALSE(probes.empty());
NetworkStateEstimate state_estimate;
state_estimate.link_capacity_upper = 1.2 * probes[0].target_data_rate / 2;
probe_controller->SetNetworkStateEstimate(state_estimate);
// No immediate further probing since probe result is low.
probes = probe_controller->SetEstimatedBitrate(
probes[0].target_data_rate / 2, /*bwe_limited_due_to_packet_loss=*/false,
fixture.CurrentTime());
ASSERT_TRUE(probes.empty());
fixture.AdvanceTime(TimeDelta::Seconds(5));
probes = probe_controller->Process(fixture.CurrentTime());
ASSERT_FALSE(probes.empty());
EXPECT_LE(probes[0].target_data_rate, state_estimate.link_capacity_upper);
// If the network state estimate increase above the threshold to probe
// further, and the probe suceeed, expect a new probe.
state_estimate.link_capacity_upper = 3 * kStartBitrate;
probe_controller->SetNetworkStateEstimate(state_estimate);
probes = probe_controller->SetEstimatedBitrate(
probes[0].target_data_rate, /*bwe_limited_due_to_packet_loss=*/false,
fixture.CurrentTime());
EXPECT_FALSE(probes.empty());
}
TEST(ProbeControllerTest, SkipAlrProbeIfEstimateLargerThanMaxProbe) {
ProbeControllerFixture fixture(
"WebRTC-Bwe-ProbingConfiguration/"