| // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "net/quic/congestion_control/pacing_sender.h" |
| |
| #include <memory> |
| |
| #include "base/logging.h" |
| #include "net/quic/quic_protocol.h" |
| #include "net/quic/test_tools/mock_clock.h" |
| #include "net/quic/test_tools/quic_test_utils.h" |
| #include "testing/gtest/include/gtest/gtest.h" |
| |
| using testing::Return; |
| using testing::StrictMock; |
| using testing::_; |
| |
| namespace net { |
| namespace test { |
| |
| const QuicByteCount kBytesInFlight = 1024; |
| const int kInitialBurstPackets = 10; |
| |
| class PacingSenderTest : public ::testing::Test { |
| protected: |
| PacingSenderTest() |
| : zero_time_(QuicTime::Delta::Zero()), |
| infinite_time_(QuicTime::Delta::Infinite()), |
| packet_number_(1), |
| mock_sender_(new StrictMock<MockSendAlgorithm>()), |
| pacing_sender_(new PacingSender(mock_sender_, |
| QuicTime::Delta::FromMilliseconds(1), |
| 0)) { |
| // Pick arbitrary time. |
| clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(9)); |
| } |
| |
| ~PacingSenderTest() override {} |
| |
| void InitPacingRate(QuicPacketCount burst_size, QuicBandwidth bandwidth) { |
| pacing_sender_.reset(); |
| mock_sender_ = new StrictMock<MockSendAlgorithm>(); |
| pacing_sender_.reset(new PacingSender( |
| mock_sender_, QuicTime::Delta::FromMilliseconds(1), burst_size)); |
| EXPECT_CALL(*mock_sender_, PacingRate()).WillRepeatedly(Return(bandwidth)); |
| } |
| |
| void CheckPacketIsSentImmediately(HasRetransmittableData retransmittable_data, |
| QuicByteCount bytes_in_flight, |
| bool in_recovery) { |
| // In order for the packet to be sendable, the underlying sender must |
| // permit it to be sent immediately. |
| for (int i = 0; i < 2; ++i) { |
| EXPECT_CALL(*mock_sender_, TimeUntilSend(clock_.Now(), bytes_in_flight)) |
| .WillOnce(Return(zero_time_)); |
| // Verify that the packet can be sent immediately. |
| EXPECT_EQ(zero_time_, |
| pacing_sender_->TimeUntilSend(clock_.Now(), bytes_in_flight)); |
| } |
| |
| // Actually send the packet. |
| if (bytes_in_flight == 0) { |
| EXPECT_CALL(*mock_sender_, InRecovery()).WillOnce(Return(in_recovery)); |
| } |
| EXPECT_CALL(*mock_sender_, |
| OnPacketSent(clock_.Now(), bytes_in_flight, packet_number_, |
| kMaxPacketSize, retransmittable_data)); |
| pacing_sender_->OnPacketSent(clock_.Now(), bytes_in_flight, |
| packet_number_++, kMaxPacketSize, |
| retransmittable_data); |
| } |
| |
| void CheckPacketIsSentImmediately() { |
| CheckPacketIsSentImmediately(HAS_RETRANSMITTABLE_DATA, kBytesInFlight, |
| false); |
| } |
| |
| void CheckPacketIsDelayed(QuicTime::Delta delay) { |
| // In order for the packet to be sendable, the underlying sender must |
| // permit it to be sent immediately. |
| for (int i = 0; i < 2; ++i) { |
| EXPECT_CALL(*mock_sender_, TimeUntilSend(clock_.Now(), kBytesInFlight)) |
| .WillOnce(Return(zero_time_)); |
| // Verify that the packet is delayed. |
| EXPECT_EQ(delay.ToMicroseconds(), |
| pacing_sender_->TimeUntilSend(clock_.Now(), kBytesInFlight) |
| .ToMicroseconds()); |
| } |
| } |
| |
| void UpdateRtt() { |
| EXPECT_CALL(*mock_sender_, OnCongestionEvent(true, kBytesInFlight, _, _)); |
| SendAlgorithmInterface::CongestionVector empty_map; |
| pacing_sender_->OnCongestionEvent(true, kBytesInFlight, empty_map, |
| empty_map); |
| } |
| |
| const QuicTime::Delta zero_time_; |
| const QuicTime::Delta infinite_time_; |
| MockClock clock_; |
| QuicPacketNumber packet_number_; |
| StrictMock<MockSendAlgorithm>* mock_sender_; |
| std::unique_ptr<PacingSender> pacing_sender_; |
| }; |
| |
| TEST_F(PacingSenderTest, NoSend) { |
| for (int i = 0; i < 2; ++i) { |
| EXPECT_CALL(*mock_sender_, TimeUntilSend(clock_.Now(), kBytesInFlight)) |
| .WillOnce(Return(infinite_time_)); |
| EXPECT_EQ(infinite_time_, |
| pacing_sender_->TimeUntilSend(clock_.Now(), kBytesInFlight)); |
| } |
| } |
| |
| TEST_F(PacingSenderTest, SendNow) { |
| for (int i = 0; i < 2; ++i) { |
| EXPECT_CALL(*mock_sender_, TimeUntilSend(clock_.Now(), kBytesInFlight)) |
| .WillOnce(Return(zero_time_)); |
| EXPECT_EQ(zero_time_, |
| pacing_sender_->TimeUntilSend(clock_.Now(), kBytesInFlight)); |
| } |
| } |
| |
| TEST_F(PacingSenderTest, VariousSending) { |
| // Configure pacing rate of 1 packet per 1 ms, no initial burst. |
| InitPacingRate(0, QuicBandwidth::FromBytesAndTimeDelta( |
| kMaxPacketSize, QuicTime::Delta::FromMilliseconds(1))); |
| |
| // Now update the RTT and verify that packets are actually paced. |
| UpdateRtt(); |
| |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| |
| // The first packet was a "make up", then we sent two packets "into the |
| // future", so the delay should be 2. |
| CheckPacketIsDelayed(QuicTime::Delta::FromMilliseconds(2)); |
| |
| // Wake up on time. |
| clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(2)); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsDelayed(QuicTime::Delta::FromMilliseconds(2)); |
| |
| // Wake up late. |
| clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(4)); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsDelayed(QuicTime::Delta::FromMilliseconds(2)); |
| |
| // Wake up really late. |
| clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(8)); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsDelayed(QuicTime::Delta::FromMilliseconds(2)); |
| |
| // Wake up really late again, but application pause partway through. |
| clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(8)); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(100)); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsDelayed(QuicTime::Delta::FromMilliseconds(2)); |
| |
| // Wake up too early. |
| CheckPacketIsDelayed(QuicTime::Delta::FromMilliseconds(2)); |
| |
| // Wake up early, but after enough time has passed to permit a send. |
| clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(1)); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsDelayed(QuicTime::Delta::FromMilliseconds(2)); |
| } |
| |
| TEST_F(PacingSenderTest, InitialBurst) { |
| // Configure pacing rate of 1 packet per 1 ms. |
| InitPacingRate(10, QuicBandwidth::FromBytesAndTimeDelta( |
| kMaxPacketSize, QuicTime::Delta::FromMilliseconds(1))); |
| |
| EXPECT_CALL(*mock_sender_, GetCongestionWindow()) |
| .WillOnce(Return(10 * kDefaultTCPMSS)); |
| // Update the RTT and verify that the first 10 packets aren't paced. |
| UpdateRtt(); |
| |
| // Send 10 packets, and verify that they are not paced. |
| for (int i = 0; i < kInitialBurstPackets; ++i) { |
| CheckPacketIsSentImmediately(); |
| } |
| |
| // The first packet was a "make up", then we sent two packets "into the |
| // future", so the delay should be 2ms. |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsDelayed(QuicTime::Delta::FromMilliseconds(2)); |
| |
| clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(5)); |
| CheckPacketIsSentImmediately(); |
| |
| // Next time TimeUntilSend is called with no bytes in flight, pacing should |
| // allow a packet to be sent, and when it's sent, the tokens are refilled. |
| CheckPacketIsSentImmediately(HAS_RETRANSMITTABLE_DATA, 0, false); |
| for (int i = 0; i < kInitialBurstPackets - 1; ++i) { |
| CheckPacketIsSentImmediately(); |
| } |
| |
| // The first packet was a "make up", then we sent two packets "into the |
| // future", so the delay should be 2ms. |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsDelayed(QuicTime::Delta::FromMilliseconds(2)); |
| } |
| |
| TEST_F(PacingSenderTest, InitialBurstNoRttMeasurement) { |
| // Configure pacing rate of 1 packet per 1 ms. |
| InitPacingRate(10, QuicBandwidth::FromBytesAndTimeDelta( |
| kMaxPacketSize, QuicTime::Delta::FromMilliseconds(1))); |
| |
| EXPECT_CALL(*mock_sender_, GetCongestionWindow()) |
| .WillOnce(Return(10 * kDefaultTCPMSS)); |
| // Send 10 packets, and verify that they are not paced. |
| for (int i = 0; i < kInitialBurstPackets; ++i) { |
| CheckPacketIsSentImmediately(); |
| } |
| |
| // The first packet was a "make up", then we sent two packets "into the |
| // future", so the delay should be 2ms. |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsDelayed(QuicTime::Delta::FromMilliseconds(2)); |
| |
| clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(5)); |
| CheckPacketIsSentImmediately(); |
| |
| // Next time TimeUntilSend is called with no bytes in flight, the tokens |
| // should be refilled and there should be no delay. |
| CheckPacketIsSentImmediately(HAS_RETRANSMITTABLE_DATA, 0, false); |
| // Send 10 packets, and verify that they are not paced. |
| for (int i = 0; i < kInitialBurstPackets - 1; ++i) { |
| CheckPacketIsSentImmediately(); |
| } |
| |
| // The first packet was a "make up", then we sent two packets "into the |
| // future", so the delay should be 2ms. |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsDelayed(QuicTime::Delta::FromMilliseconds(2)); |
| } |
| |
| TEST_F(PacingSenderTest, FastSending) { |
| // Ensure the pacing sender paces, even when the inter-packet spacing is less |
| // than the pacing granularity. |
| InitPacingRate(10, |
| QuicBandwidth::FromBytesAndTimeDelta( |
| 2 * kMaxPacketSize, QuicTime::Delta::FromMilliseconds(1))); |
| |
| EXPECT_CALL(*mock_sender_, GetCongestionWindow()) |
| .WillOnce(Return(10 * kDefaultTCPMSS)); |
| // Update the RTT and verify that the first 10 packets aren't paced. |
| UpdateRtt(); |
| |
| // Send 10 packets, and verify that they are not paced. |
| for (int i = 0; i < kInitialBurstPackets; ++i) { |
| CheckPacketIsSentImmediately(); |
| } |
| |
| // The first packet was a "make up", then we sent two packets "into the |
| // future", since it's 2 packets/ms, so the delay should be 1.5ms. |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsDelayed(QuicTime::Delta::FromMicroseconds(1500)); |
| |
| clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(5)); |
| CheckPacketIsSentImmediately(); |
| |
| // Next time TimeUntilSend is called with no bytes in flight, the tokens |
| // should be refilled and there should be no delay. |
| CheckPacketIsSentImmediately(HAS_RETRANSMITTABLE_DATA, 0, false); |
| for (int i = 0; i < kInitialBurstPackets - 1; ++i) { |
| CheckPacketIsSentImmediately(); |
| } |
| |
| // The first packet was a "make up", then we sent two packets "into the |
| // future", so the delay should be 1.5ms. |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsDelayed(QuicTime::Delta::FromMicroseconds(1500)); |
| } |
| |
| TEST_F(PacingSenderTest, NoBurstEnteringRecovery) { |
| ValueRestore<bool> old_flag(&FLAGS_quic_allow_noprr, true); |
| // Configure pacing rate of 1 packet per 1 ms with no burst tokens. |
| InitPacingRate(0, QuicBandwidth::FromBytesAndTimeDelta( |
| kMaxPacketSize, QuicTime::Delta::FromMilliseconds(1))); |
| // Sending a packet will set burst tokens. |
| CheckPacketIsSentImmediately(); |
| |
| // Losing a packet will set clear burst tokens. |
| SendAlgorithmInterface::CongestionVector lost_packets; |
| lost_packets.push_back(std::make_pair(1, kMaxPacketSize)); |
| SendAlgorithmInterface::CongestionVector empty; |
| EXPECT_CALL(*mock_sender_, |
| OnCongestionEvent(true, kMaxPacketSize, empty, lost_packets)); |
| pacing_sender_->OnCongestionEvent(true, kMaxPacketSize, empty, lost_packets); |
| // One packet is sent immediately, because of 1ms pacing granularity. |
| CheckPacketIsSentImmediately(); |
| // Ensure packets are immediately paced. |
| EXPECT_CALL(*mock_sender_, TimeUntilSend(clock_.Now(), kDefaultTCPMSS)) |
| .WillOnce(Return(zero_time_)); |
| // Verify the next packet is paced and delayed 2ms due to granularity. |
| EXPECT_EQ(QuicTime::Delta::FromMilliseconds(2), |
| pacing_sender_->TimeUntilSend(clock_.Now(), kDefaultTCPMSS)); |
| CheckPacketIsDelayed(QuicTime::Delta::FromMilliseconds(2)); |
| } |
| |
| TEST_F(PacingSenderTest, NoBurstInRecovery) { |
| // Configure pacing rate of 1 packet per 1 ms with no burst tokens. |
| InitPacingRate(0, QuicBandwidth::FromBytesAndTimeDelta( |
| kMaxPacketSize, QuicTime::Delta::FromMilliseconds(1))); |
| |
| UpdateRtt(); |
| |
| // Ensure only one packet is sent immediately and the rest are paced. |
| CheckPacketIsSentImmediately(HAS_RETRANSMITTABLE_DATA, 0, true); |
| CheckPacketIsSentImmediately(); |
| CheckPacketIsDelayed(QuicTime::Delta::FromMilliseconds(2)); |
| } |
| |
| TEST_F(PacingSenderTest, VerifyInnerSenderCalled) { |
| QuicBandwidth kBandwidth = QuicBandwidth::FromBitsPerSecond(1000); |
| QuicTime kTime = QuicTime::Infinite(); |
| QuicTime::Delta kTimeDelta = QuicTime::Delta::Infinite(); |
| QuicByteCount kBytes = 12345u; |
| |
| EXPECT_CALL(*mock_sender_, SetFromConfig(_, Perspective::IS_SERVER)); |
| QuicConfig config; |
| pacing_sender_->SetFromConfig(config, Perspective::IS_SERVER); |
| |
| EXPECT_CALL(*mock_sender_, ResumeConnectionState(_, true)); |
| CachedNetworkParameters cached_network_params; |
| pacing_sender_->ResumeConnectionState(cached_network_params, true); |
| |
| EXPECT_CALL(*mock_sender_, SetNumEmulatedConnections(2)); |
| pacing_sender_->SetNumEmulatedConnections(2); |
| |
| EXPECT_CALL(*mock_sender_, SetMaxCongestionWindow(kBytes)); |
| pacing_sender_->SetMaxCongestionWindow(kBytes); |
| |
| SendAlgorithmInterface::CongestionVector packets; |
| EXPECT_CALL(*mock_sender_, OnCongestionEvent(true, kBytes, packets, packets)); |
| pacing_sender_->OnCongestionEvent(true, kBytes, packets, packets); |
| |
| EXPECT_CALL(*mock_sender_, OnPacketSent(kTime, kBytes, 123u, kBytes, |
| HAS_RETRANSMITTABLE_DATA)); |
| EXPECT_CALL(*mock_sender_, PacingRate()).WillOnce(Return(kBandwidth)); |
| pacing_sender_->OnPacketSent(kTime, kBytes, 123u, kBytes, |
| HAS_RETRANSMITTABLE_DATA); |
| |
| EXPECT_CALL(*mock_sender_, OnRetransmissionTimeout(true)); |
| pacing_sender_->OnRetransmissionTimeout(true); |
| |
| EXPECT_CALL(*mock_sender_, OnConnectionMigration()); |
| pacing_sender_->OnConnectionMigration(); |
| |
| EXPECT_CALL(*mock_sender_, TimeUntilSend(kTime, kBytes)) |
| .WillOnce(Return(kTimeDelta)); |
| pacing_sender_->TimeUntilSend(kTime, kBytes); |
| |
| EXPECT_CALL(*mock_sender_, PacingRate()).WillOnce(Return(kBandwidth)); |
| EXPECT_EQ(kBandwidth, pacing_sender_->PacingRate()); |
| |
| EXPECT_CALL(*mock_sender_, BandwidthEstimate()).WillOnce(Return(kBandwidth)); |
| EXPECT_EQ(kBandwidth, pacing_sender_->BandwidthEstimate()); |
| |
| EXPECT_CALL(*mock_sender_, RetransmissionDelay()) |
| .WillOnce(Return(kTimeDelta)); |
| EXPECT_EQ(kTimeDelta, pacing_sender_->RetransmissionDelay()); |
| |
| EXPECT_CALL(*mock_sender_, GetCongestionWindow()).WillOnce(Return(kBytes)); |
| EXPECT_EQ(kBytes, pacing_sender_->GetCongestionWindow()); |
| |
| EXPECT_CALL(*mock_sender_, InSlowStart()).WillOnce(Return(true)); |
| EXPECT_TRUE(pacing_sender_->InSlowStart()); |
| |
| EXPECT_CALL(*mock_sender_, InRecovery()).WillOnce(Return(true)); |
| EXPECT_TRUE(pacing_sender_->InRecovery()); |
| |
| EXPECT_CALL(*mock_sender_, GetSlowStartThreshold()).WillOnce(Return(kBytes)); |
| EXPECT_EQ(kBytes, pacing_sender_->GetSlowStartThreshold()); |
| |
| EXPECT_CALL(*mock_sender_, GetCongestionControlType()) |
| .WillOnce(Return(kReno)); |
| EXPECT_EQ(kReno, pacing_sender_->GetCongestionControlType()); |
| } |
| |
| } // namespace test |
| } // namespace net |