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Unified Diff: net/quic/congestion_control/tcp_cubic_sender_bytes_test.cc

Issue 2193073003: Move shared files in net/quic/ into net/quic/core/ (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: io_thread_unittest.cc Created 4 years, 5 months ago
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Index: net/quic/congestion_control/tcp_cubic_sender_bytes_test.cc
diff --git a/net/quic/congestion_control/tcp_cubic_sender_bytes_test.cc b/net/quic/congestion_control/tcp_cubic_sender_bytes_test.cc
deleted file mode 100644
index 21fcd17a84400d7f136f99604316cf6fcc67abcd..0000000000000000000000000000000000000000
--- a/net/quic/congestion_control/tcp_cubic_sender_bytes_test.cc
+++ /dev/null
@@ -1,894 +0,0 @@
-// Copyright (c) 2015 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/tcp_cubic_sender_bytes.h"
-
-#include <algorithm>
-#include <cstdint>
-#include <memory>
-
-#include "base/logging.h"
-#include "net/quic/congestion_control/rtt_stats.h"
-#include "net/quic/crypto/crypto_protocol.h"
-#include "net/quic/proto/cached_network_parameters.pb.h"
-#include "net/quic/quic_flags.h"
-#include "net/quic/quic_protocol.h"
-#include "net/quic/quic_utils.h"
-#include "net/quic/test_tools/mock_clock.h"
-#include "net/quic/test_tools/quic_config_peer.h"
-#include "net/quic/test_tools/quic_test_utils.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace net {
-namespace test {
-
-// TODO(ianswett): A number of theses tests were written with the assumption of
-// an initial CWND of 10. They have carefully calculated values which should be
-// updated to be based on kInitialCongestionWindow.
-const uint32_t kInitialCongestionWindowPackets = 10;
-const uint32_t kMaxCongestionWindowPackets = 200;
-const uint32_t kDefaultWindowTCP =
- kInitialCongestionWindowPackets * kDefaultTCPMSS;
-const float kRenoBeta = 0.7f; // Reno backoff factor.
-
-class TcpCubicSenderBytesPeer : public TcpCubicSenderBytes {
- public:
- TcpCubicSenderBytesPeer(const QuicClock* clock, bool reno)
- : TcpCubicSenderBytes(clock,
- &rtt_stats_,
- reno,
- kInitialCongestionWindowPackets,
- kMaxCongestionWindowPackets,
- &stats_) {}
-
- const HybridSlowStart& hybrid_slow_start() const {
- return hybrid_slow_start_;
- }
-
- float GetRenoBeta() const { return RenoBeta(); }
-
- RttStats rtt_stats_;
- QuicConnectionStats stats_;
-};
-
-class TcpCubicSenderBytesTest : public ::testing::Test {
- protected:
- TcpCubicSenderBytesTest()
- : one_ms_(QuicTime::Delta::FromMilliseconds(1)),
- sender_(new TcpCubicSenderBytesPeer(&clock_, true)),
- packet_number_(1),
- acked_packet_number_(0),
- bytes_in_flight_(0) {}
-
- int SendAvailableSendWindow() {
- return SendAvailableSendWindow(kDefaultTCPMSS);
- }
-
- int SendAvailableSendWindow(QuicPacketLength packet_length) {
- // Send as long as TimeUntilSend returns Zero.
- int packets_sent = 0;
- bool can_send =
- sender_->TimeUntilSend(clock_.Now(), bytes_in_flight_).IsZero();
- while (can_send) {
- sender_->OnPacketSent(clock_.Now(), bytes_in_flight_, packet_number_++,
- kDefaultTCPMSS, HAS_RETRANSMITTABLE_DATA);
- ++packets_sent;
- bytes_in_flight_ += kDefaultTCPMSS;
- can_send =
- sender_->TimeUntilSend(clock_.Now(), bytes_in_flight_).IsZero();
- }
- return packets_sent;
- }
-
- // Normal is that TCP acks every other segment.
- void AckNPackets(int n) {
- sender_->rtt_stats_.UpdateRtt(QuicTime::Delta::FromMilliseconds(60),
- QuicTime::Delta::Zero(), clock_.Now());
- SendAlgorithmInterface::CongestionVector acked_packets;
- SendAlgorithmInterface::CongestionVector lost_packets;
- for (int i = 0; i < n; ++i) {
- ++acked_packet_number_;
- acked_packets.push_back(
- std::make_pair(acked_packet_number_, kDefaultTCPMSS));
- }
- sender_->OnCongestionEvent(true, bytes_in_flight_, acked_packets,
- lost_packets);
- bytes_in_flight_ -= n * kDefaultTCPMSS;
- clock_.AdvanceTime(one_ms_);
- }
-
- void LoseNPackets(int n) { LoseNPackets(n, kDefaultTCPMSS); }
-
- void LoseNPackets(int n, QuicPacketLength packet_length) {
- SendAlgorithmInterface::CongestionVector acked_packets;
- SendAlgorithmInterface::CongestionVector lost_packets;
- for (int i = 0; i < n; ++i) {
- ++acked_packet_number_;
- lost_packets.push_back(
- std::make_pair(acked_packet_number_, packet_length));
- }
- sender_->OnCongestionEvent(false, bytes_in_flight_, acked_packets,
- lost_packets);
- bytes_in_flight_ -= n * packet_length;
- }
-
- // Does not increment acked_packet_number_.
- void LosePacket(QuicPacketNumber packet_number) {
- SendAlgorithmInterface::CongestionVector acked_packets;
- SendAlgorithmInterface::CongestionVector lost_packets;
- lost_packets.push_back(std::make_pair(packet_number, kDefaultTCPMSS));
- sender_->OnCongestionEvent(false, bytes_in_flight_, acked_packets,
- lost_packets);
- bytes_in_flight_ -= kDefaultTCPMSS;
- }
-
- const QuicTime::Delta one_ms_;
- MockClock clock_;
- std::unique_ptr<TcpCubicSenderBytesPeer> sender_;
- QuicPacketNumber packet_number_;
- QuicPacketNumber acked_packet_number_;
- QuicByteCount bytes_in_flight_;
-};
-
-TEST_F(TcpCubicSenderBytesTest, SimpleSender) {
- // At startup make sure we are at the default.
- EXPECT_EQ(kDefaultWindowTCP, sender_->GetCongestionWindow());
- // At startup make sure we can send.
- EXPECT_TRUE(sender_->TimeUntilSend(clock_.Now(), 0).IsZero());
- // Make sure we can send.
- EXPECT_TRUE(sender_->TimeUntilSend(clock_.Now(), 0).IsZero());
- // And that window is un-affected.
- EXPECT_EQ(kDefaultWindowTCP, sender_->GetCongestionWindow());
-
- // Fill the send window with data, then verify that we can't send.
- SendAvailableSendWindow();
- EXPECT_FALSE(
- sender_->TimeUntilSend(clock_.Now(), sender_->GetCongestionWindow())
- .IsZero());
-}
-
-TEST_F(TcpCubicSenderBytesTest, ApplicationLimitedSlowStart) {
- // Send exactly 10 packets and ensure the CWND ends at 14 packets.
- const int kNumberOfAcks = 5;
- // At startup make sure we can send.
- EXPECT_TRUE(sender_->TimeUntilSend(clock_.Now(), 0).IsZero());
- // Make sure we can send.
- EXPECT_TRUE(sender_->TimeUntilSend(clock_.Now(), 0).IsZero());
-
- SendAvailableSendWindow();
- for (int i = 0; i < kNumberOfAcks; ++i) {
- AckNPackets(2);
- }
- QuicByteCount bytes_to_send = sender_->GetCongestionWindow();
- // It's expected 2 acks will arrive when the bytes_in_flight are greater than
- // half the CWND.
- EXPECT_EQ(kDefaultWindowTCP + kDefaultTCPMSS * 2 * 2, bytes_to_send);
-}
-
-TEST_F(TcpCubicSenderBytesTest, ExponentialSlowStart) {
- const int kNumberOfAcks = 20;
- // At startup make sure we can send.
- EXPECT_TRUE(sender_->TimeUntilSend(clock_.Now(), 0).IsZero());
- EXPECT_EQ(QuicBandwidth::Zero(), sender_->BandwidthEstimate());
- // Make sure we can send.
- EXPECT_TRUE(sender_->TimeUntilSend(clock_.Now(), 0).IsZero());
-
- for (int i = 0; i < kNumberOfAcks; ++i) {
- // Send our full send window.
- SendAvailableSendWindow();
- AckNPackets(2);
- }
- const QuicByteCount cwnd = sender_->GetCongestionWindow();
- EXPECT_EQ(kDefaultWindowTCP + kDefaultTCPMSS * 2 * kNumberOfAcks, cwnd);
- EXPECT_EQ(QuicBandwidth::FromBytesAndTimeDelta(
- cwnd, sender_->rtt_stats_.smoothed_rtt()),
- sender_->BandwidthEstimate());
-}
-
-TEST_F(TcpCubicSenderBytesTest, SlowStartPacketLoss) {
- sender_->SetNumEmulatedConnections(1);
- const int kNumberOfAcks = 10;
- for (int i = 0; i < kNumberOfAcks; ++i) {
- // Send our full send window.
- SendAvailableSendWindow();
- AckNPackets(2);
- }
- SendAvailableSendWindow();
- QuicByteCount expected_send_window =
- kDefaultWindowTCP + (kDefaultTCPMSS * 2 * kNumberOfAcks);
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // Lose a packet to exit slow start.
- LoseNPackets(1);
- size_t packets_in_recovery_window = expected_send_window / kDefaultTCPMSS;
-
- // We should now have fallen out of slow start with a reduced window.
- expected_send_window *= kRenoBeta;
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // Recovery phase. We need to ack every packet in the recovery window before
- // we exit recovery.
- size_t number_of_packets_in_window = expected_send_window / kDefaultTCPMSS;
- DVLOG(1) << "number_packets: " << number_of_packets_in_window;
- AckNPackets(packets_in_recovery_window);
- SendAvailableSendWindow();
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // We need to ack an entire window before we increase CWND by 1.
- AckNPackets(number_of_packets_in_window - 2);
- SendAvailableSendWindow();
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // Next ack should increase cwnd by 1.
- AckNPackets(1);
- expected_send_window += kDefaultTCPMSS;
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // Now RTO and ensure slow start gets reset.
- EXPECT_TRUE(sender_->hybrid_slow_start().started());
- sender_->OnRetransmissionTimeout(true);
- EXPECT_FALSE(sender_->hybrid_slow_start().started());
-}
-
-TEST_F(TcpCubicSenderBytesTest, SlowStartPacketLossWithLargeReduction) {
- QuicConfig config;
- QuicTagVector options;
- options.push_back(kSSLR);
- QuicConfigPeer::SetReceivedConnectionOptions(&config, options);
- sender_->SetFromConfig(config, Perspective::IS_SERVER);
-
- sender_->SetNumEmulatedConnections(1);
- const int kNumberOfAcks = (kDefaultWindowTCP / (2 * kDefaultTCPMSS)) - 1;
- for (int i = 0; i < kNumberOfAcks; ++i) {
- // Send our full send window.
- SendAvailableSendWindow();
- AckNPackets(2);
- }
- SendAvailableSendWindow();
- QuicByteCount expected_send_window =
- kDefaultWindowTCP + (kDefaultTCPMSS * 2 * kNumberOfAcks);
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // Lose a packet to exit slow start. We should now have fallen out of
- // slow start with a window reduced by 1.
- LoseNPackets(1);
- expected_send_window -= kDefaultTCPMSS;
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // Lose 5 packets in recovery and verify that congestion window is reduced
- // further.
- LoseNPackets(5);
- expected_send_window -= 5 * kDefaultTCPMSS;
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
- // Lose another 10 packets and ensure it reduces below half the peak CWND,
- // because we never acked the full IW.
- LoseNPackets(10);
- expected_send_window -= 10 * kDefaultTCPMSS;
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- size_t packets_in_recovery_window = expected_send_window / kDefaultTCPMSS;
-
- // Recovery phase. We need to ack every packet in the recovery window before
- // we exit recovery.
- size_t number_of_packets_in_window = expected_send_window / kDefaultTCPMSS;
- DVLOG(1) << "number_packets: " << number_of_packets_in_window;
- AckNPackets(packets_in_recovery_window);
- SendAvailableSendWindow();
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // We need to ack an entire window before we increase CWND by 1.
- AckNPackets(number_of_packets_in_window - 1);
- SendAvailableSendWindow();
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // Next ack should increase cwnd by 1.
- AckNPackets(1);
- expected_send_window += kDefaultTCPMSS;
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // Now RTO and ensure slow start gets reset.
- EXPECT_TRUE(sender_->hybrid_slow_start().started());
- sender_->OnRetransmissionTimeout(true);
- EXPECT_FALSE(sender_->hybrid_slow_start().started());
-}
-
-TEST_F(TcpCubicSenderBytesTest, SlowStartHalfPacketLossWithLargeReduction) {
- QuicConfig config;
- QuicTagVector options;
- options.push_back(kSSLR);
- QuicConfigPeer::SetReceivedConnectionOptions(&config, options);
- sender_->SetFromConfig(config, Perspective::IS_SERVER);
-
- sender_->SetNumEmulatedConnections(1);
- const int kNumberOfAcks = 10;
- for (int i = 0; i < kNumberOfAcks; ++i) {
- // Send our full send window in half sized packets.
- SendAvailableSendWindow(kDefaultTCPMSS / 2);
- AckNPackets(2);
- }
- SendAvailableSendWindow(kDefaultTCPMSS / 2);
- QuicByteCount expected_send_window =
- kDefaultWindowTCP + (kDefaultTCPMSS * 2 * kNumberOfAcks);
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // Lose a packet to exit slow start. We should now have fallen out of
- // slow start with a window reduced by 1.
- LoseNPackets(1);
- expected_send_window -= kDefaultTCPMSS;
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // Lose 10 packets in recovery and verify that congestion window is reduced
- // by 5 packets.
- LoseNPackets(10, kDefaultTCPMSS / 2);
- expected_send_window -= 5 * kDefaultTCPMSS;
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-}
-
-TEST_F(TcpCubicSenderBytesTest, SlowStartPacketLossWithMaxHalfReduction) {
- QuicConfig config;
- QuicTagVector options;
- options.push_back(kSSLR);
- QuicConfigPeer::SetReceivedConnectionOptions(&config, options);
- sender_->SetFromConfig(config, Perspective::IS_SERVER);
-
- sender_->SetNumEmulatedConnections(1);
- const int kNumberOfAcks = kInitialCongestionWindowPackets / 2;
- for (int i = 0; i < kNumberOfAcks; ++i) {
- // Send our full send window.
- SendAvailableSendWindow();
- AckNPackets(2);
- }
- SendAvailableSendWindow();
- QuicByteCount expected_send_window =
- kDefaultWindowTCP + (kDefaultTCPMSS * 2 * kNumberOfAcks);
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // Lose a packet to exit slow start. We should now have fallen out of
- // slow start with a window reduced by 1.
- LoseNPackets(1);
- expected_send_window -= kDefaultTCPMSS;
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // Lose half the outstanding packets in recovery and verify the congestion
- // window is only reduced by a max of half.
- LoseNPackets(kNumberOfAcks * 2);
- expected_send_window -= (kNumberOfAcks * 2 - 1) * kDefaultTCPMSS;
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
- LoseNPackets(5);
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-}
-
-TEST_F(TcpCubicSenderBytesTest, NoPRRWhenLessThanOnePacketInFlight) {
- SendAvailableSendWindow();
- LoseNPackets(kInitialCongestionWindowPackets - 1);
- AckNPackets(1);
- // PRR will allow 2 packets for every ack during recovery.
- EXPECT_EQ(2, SendAvailableSendWindow());
- // Simulate abandoning all packets by supplying a bytes_in_flight of 0.
- // PRR should now allow a packet to be sent, even though prr's state variables
- // believe it has sent enough packets.
- EXPECT_EQ(QuicTime::Delta::Zero(), sender_->TimeUntilSend(clock_.Now(), 0));
-}
-
-TEST_F(TcpCubicSenderBytesTest, SlowStartPacketLossPRR) {
- sender_->SetNumEmulatedConnections(1);
- // Test based on the first example in RFC6937.
- // Ack 10 packets in 5 acks to raise the CWND to 20, as in the example.
- const int kNumberOfAcks = 5;
- for (int i = 0; i < kNumberOfAcks; ++i) {
- // Send our full send window.
- SendAvailableSendWindow();
- AckNPackets(2);
- }
- SendAvailableSendWindow();
- QuicByteCount expected_send_window =
- kDefaultWindowTCP + (kDefaultTCPMSS * 2 * kNumberOfAcks);
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- LoseNPackets(1);
-
- // We should now have fallen out of slow start with a reduced window.
- size_t send_window_before_loss = expected_send_window;
- expected_send_window *= kRenoBeta;
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // Testing TCP proportional rate reduction.
- // We should send packets paced over the received acks for the remaining
- // outstanding packets. The number of packets before we exit recovery is the
- // original CWND minus the packet that has been lost and the one which
- // triggered the loss.
- size_t remaining_packets_in_recovery =
- send_window_before_loss / kDefaultTCPMSS - 2;
-
- for (size_t i = 0; i < remaining_packets_in_recovery; ++i) {
- AckNPackets(1);
- SendAvailableSendWindow();
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
- }
-
- // We need to ack another window before we increase CWND by 1.
- size_t number_of_packets_in_window = expected_send_window / kDefaultTCPMSS;
- for (size_t i = 0; i < number_of_packets_in_window; ++i) {
- AckNPackets(1);
- EXPECT_EQ(1, SendAvailableSendWindow());
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
- }
-
- AckNPackets(1);
- expected_send_window += kDefaultTCPMSS;
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-}
-
-TEST_F(TcpCubicSenderBytesTest, SlowStartBurstPacketLossPRR) {
- sender_->SetNumEmulatedConnections(1);
- // Test based on the second example in RFC6937, though we also implement
- // forward acknowledgements, so the first two incoming acks will trigger
- // PRR immediately.
- // Ack 20 packets in 10 acks to raise the CWND to 30.
- const int kNumberOfAcks = 10;
- for (int i = 0; i < kNumberOfAcks; ++i) {
- // Send our full send window.
- SendAvailableSendWindow();
- AckNPackets(2);
- }
- SendAvailableSendWindow();
- QuicByteCount expected_send_window =
- kDefaultWindowTCP + (kDefaultTCPMSS * 2 * kNumberOfAcks);
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // Lose one more than the congestion window reduction, so that after loss,
- // bytes_in_flight is lesser than the congestion window.
- size_t send_window_after_loss = kRenoBeta * expected_send_window;
- size_t num_packets_to_lose =
- (expected_send_window - send_window_after_loss) / kDefaultTCPMSS + 1;
- LoseNPackets(num_packets_to_lose);
- // Immediately after the loss, ensure at least one packet can be sent.
- // Losses without subsequent acks can occur with timer based loss detection.
- EXPECT_TRUE(sender_->TimeUntilSend(clock_.Now(), bytes_in_flight_).IsZero());
- AckNPackets(1);
-
- // We should now have fallen out of slow start with a reduced window.
- expected_send_window *= kRenoBeta;
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // Only 2 packets should be allowed to be sent, per PRR-SSRB.
- EXPECT_EQ(2, SendAvailableSendWindow());
-
- // Ack the next packet, which triggers another loss.
- LoseNPackets(1);
- AckNPackets(1);
-
- // Send 2 packets to simulate PRR-SSRB.
- EXPECT_EQ(2, SendAvailableSendWindow());
-
- // Ack the next packet, which triggers another loss.
- LoseNPackets(1);
- AckNPackets(1);
-
- // Send 2 packets to simulate PRR-SSRB.
- EXPECT_EQ(2, SendAvailableSendWindow());
-
- // Exit recovery and return to sending at the new rate.
- for (int i = 0; i < kNumberOfAcks; ++i) {
- AckNPackets(1);
- EXPECT_EQ(1, SendAvailableSendWindow());
- }
-}
-
-TEST_F(TcpCubicSenderBytesTest, RTOCongestionWindow) {
- EXPECT_EQ(kDefaultWindowTCP, sender_->GetCongestionWindow());
- // Expect the window to decrease to the minimum once the RTO fires and slow
- // start threshold to be set to 1/2 of the CWND.
- sender_->OnRetransmissionTimeout(true);
- EXPECT_EQ(2 * kDefaultTCPMSS, sender_->GetCongestionWindow());
- EXPECT_EQ(5u * kDefaultTCPMSS, sender_->GetSlowStartThreshold());
-}
-
-TEST_F(TcpCubicSenderBytesTest, RTOCongestionWindowNoRetransmission) {
- EXPECT_EQ(kDefaultWindowTCP, sender_->GetCongestionWindow());
-
- // Expect the window to remain unchanged if the RTO fires but no packets are
- // retransmitted.
- sender_->OnRetransmissionTimeout(false);
- EXPECT_EQ(kDefaultWindowTCP, sender_->GetCongestionWindow());
-}
-
-TEST_F(TcpCubicSenderBytesTest, RetransmissionDelay) {
- const int64_t kRttMs = 10;
- const int64_t kDeviationMs = 3;
- EXPECT_EQ(QuicTime::Delta::Zero(), sender_->RetransmissionDelay());
-
- sender_->rtt_stats_.UpdateRtt(QuicTime::Delta::FromMilliseconds(kRttMs),
- QuicTime::Delta::Zero(), clock_.Now());
-
- // Initial value is to set the median deviation to half of the initial rtt,
- // the median in then multiplied by a factor of 4 and finally the smoothed rtt
- // is added which is the initial rtt.
- QuicTime::Delta expected_delay =
- QuicTime::Delta::FromMilliseconds(kRttMs + kRttMs / 2 * 4);
- EXPECT_EQ(expected_delay, sender_->RetransmissionDelay());
-
- for (int i = 0; i < 100; ++i) {
- // Run to make sure that we converge.
- sender_->rtt_stats_.UpdateRtt(
- QuicTime::Delta::FromMilliseconds(kRttMs + kDeviationMs),
- QuicTime::Delta::Zero(), clock_.Now());
- sender_->rtt_stats_.UpdateRtt(
- QuicTime::Delta::FromMilliseconds(kRttMs - kDeviationMs),
- QuicTime::Delta::Zero(), clock_.Now());
- }
- expected_delay = QuicTime::Delta::FromMilliseconds(kRttMs + kDeviationMs * 4);
-
- EXPECT_NEAR(kRttMs, sender_->rtt_stats_.smoothed_rtt().ToMilliseconds(), 1);
- EXPECT_NEAR(expected_delay.ToMilliseconds(),
- sender_->RetransmissionDelay().ToMilliseconds(), 1);
- EXPECT_EQ(static_cast<int64_t>(
- sender_->GetCongestionWindow() * kNumMicrosPerSecond /
- sender_->rtt_stats_.smoothed_rtt().ToMicroseconds()),
- sender_->BandwidthEstimate().ToBytesPerSecond());
-}
-
-TEST_F(TcpCubicSenderBytesTest, TcpCubicResetEpochOnQuiescence) {
- const int kMaxCongestionWindow = 50;
- const QuicByteCount kMaxCongestionWindowBytes =
- kMaxCongestionWindow * kDefaultTCPMSS;
- int num_sent = SendAvailableSendWindow();
-
- // Make sure we fall out of slow start.
- QuicByteCount saved_cwnd = sender_->GetCongestionWindow();
- LoseNPackets(1);
- EXPECT_GT(saved_cwnd, sender_->GetCongestionWindow());
-
- // Ack the rest of the outstanding packets to get out of recovery.
- for (int i = 1; i < num_sent; ++i) {
- AckNPackets(1);
- }
- EXPECT_EQ(0u, bytes_in_flight_);
-
- // Send a new window of data and ack all; cubic growth should occur.
- saved_cwnd = sender_->GetCongestionWindow();
- num_sent = SendAvailableSendWindow();
- for (int i = 0; i < num_sent; ++i) {
- AckNPackets(1);
- }
- EXPECT_LT(saved_cwnd, sender_->GetCongestionWindow());
- EXPECT_GT(kMaxCongestionWindowBytes, sender_->GetCongestionWindow());
- EXPECT_EQ(0u, bytes_in_flight_);
-
- // Quiescent time of 100 seconds
- clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(100000));
-
- // Send new window of data and ack one packet. Cubic epoch should have
- // been reset; ensure cwnd increase is not dramatic.
- saved_cwnd = sender_->GetCongestionWindow();
- SendAvailableSendWindow();
- AckNPackets(1);
- EXPECT_NEAR(saved_cwnd, sender_->GetCongestionWindow(), kDefaultTCPMSS);
- EXPECT_GT(kMaxCongestionWindowBytes, sender_->GetCongestionWindow());
-}
-
-TEST_F(TcpCubicSenderBytesTest, MultipleLossesInOneWindow) {
- SendAvailableSendWindow();
- const QuicByteCount initial_window = sender_->GetCongestionWindow();
- LosePacket(acked_packet_number_ + 1);
- const QuicByteCount post_loss_window = sender_->GetCongestionWindow();
- EXPECT_GT(initial_window, post_loss_window);
- LosePacket(acked_packet_number_ + 3);
- EXPECT_EQ(post_loss_window, sender_->GetCongestionWindow());
- LosePacket(packet_number_ - 1);
- EXPECT_EQ(post_loss_window, sender_->GetCongestionWindow());
-
- // Lose a later packet and ensure the window decreases.
- LosePacket(packet_number_);
- EXPECT_GT(post_loss_window, sender_->GetCongestionWindow());
-}
-
-TEST_F(TcpCubicSenderBytesTest, DontTrackAckPackets) {
- // Send a packet with no retransmittable data, and ensure it's not tracked.
- EXPECT_FALSE(sender_->OnPacketSent(clock_.Now(), bytes_in_flight_,
- packet_number_++, kDefaultTCPMSS,
- NO_RETRANSMITTABLE_DATA));
-
- // Send a data packet with retransmittable data, and ensure it is tracked.
- EXPECT_TRUE(sender_->OnPacketSent(clock_.Now(), bytes_in_flight_,
- packet_number_++, kDefaultTCPMSS,
- HAS_RETRANSMITTABLE_DATA));
-}
-
-TEST_F(TcpCubicSenderBytesTest, ConfigureMaxInitialWindow) {
- QuicConfig config;
-
- // Verify that kCOPT: kIW10 forces the congestion window to the default of 10.
- QuicTagVector options;
- options.push_back(kIW10);
- QuicConfigPeer::SetReceivedConnectionOptions(&config, options);
- sender_->SetFromConfig(config, Perspective::IS_SERVER);
- EXPECT_EQ(10u * kDefaultTCPMSS, sender_->GetCongestionWindow());
-}
-
-TEST_F(TcpCubicSenderBytesTest, 2ConnectionCongestionAvoidanceAtEndOfRecovery) {
- sender_->SetNumEmulatedConnections(2);
- // Ack 10 packets in 5 acks to raise the CWND to 20.
- const int kNumberOfAcks = 5;
- for (int i = 0; i < kNumberOfAcks; ++i) {
- // Send our full send window.
- SendAvailableSendWindow();
- AckNPackets(2);
- }
- SendAvailableSendWindow();
- QuicByteCount expected_send_window =
- kDefaultWindowTCP + (kDefaultTCPMSS * 2 * kNumberOfAcks);
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- LoseNPackets(1);
-
- // We should now have fallen out of slow start with a reduced window.
- expected_send_window = expected_send_window * sender_->GetRenoBeta();
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // No congestion window growth should occur in recovery phase, i.e., until the
- // currently outstanding 20 packets are acked.
- for (int i = 0; i < 10; ++i) {
- // Send our full send window.
- SendAvailableSendWindow();
- EXPECT_TRUE(sender_->InRecovery());
- AckNPackets(2);
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
- }
- EXPECT_FALSE(sender_->InRecovery());
-
- // Out of recovery now. Congestion window should not grow for half an RTT.
- size_t packets_in_send_window = expected_send_window / kDefaultTCPMSS;
- SendAvailableSendWindow();
- AckNPackets(packets_in_send_window / 2 - 2);
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // Next ack should increase congestion window by 1MSS.
- SendAvailableSendWindow();
- AckNPackets(2);
- expected_send_window += kDefaultTCPMSS;
- packets_in_send_window += 1;
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // Congestion window should remain steady again for half an RTT.
- SendAvailableSendWindow();
- AckNPackets(packets_in_send_window / 2 - 1);
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // Next ack should cause congestion window to grow by 1MSS.
- SendAvailableSendWindow();
- AckNPackets(2);
- expected_send_window += kDefaultTCPMSS;
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-}
-
-TEST_F(TcpCubicSenderBytesTest, 1ConnectionCongestionAvoidanceAtEndOfRecovery) {
- sender_->SetNumEmulatedConnections(1);
- // Ack 10 packets in 5 acks to raise the CWND to 20.
- const int kNumberOfAcks = 5;
- for (int i = 0; i < kNumberOfAcks; ++i) {
- // Send our full send window.
- SendAvailableSendWindow();
- AckNPackets(2);
- }
- SendAvailableSendWindow();
- QuicByteCount expected_send_window =
- kDefaultWindowTCP + (kDefaultTCPMSS * 2 * kNumberOfAcks);
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- LoseNPackets(1);
-
- // We should now have fallen out of slow start with a reduced window.
- expected_send_window *= kRenoBeta;
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // No congestion window growth should occur in recovery phase, i.e., until the
- // currently outstanding 20 packets are acked.
- for (int i = 0; i < 10; ++i) {
- // Send our full send window.
- SendAvailableSendWindow();
- EXPECT_TRUE(sender_->InRecovery());
- AckNPackets(2);
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
- }
- EXPECT_FALSE(sender_->InRecovery());
-
- // Out of recovery now. Congestion window should not grow during RTT.
- for (uint64_t i = 0; i < expected_send_window / kDefaultTCPMSS - 2; i += 2) {
- // Send our full send window.
- SendAvailableSendWindow();
- AckNPackets(2);
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
- }
-
- // Next ack should cause congestion window to grow by 1MSS.
- SendAvailableSendWindow();
- AckNPackets(2);
- expected_send_window += kDefaultTCPMSS;
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-}
-
-TEST_F(TcpCubicSenderBytesTest, BandwidthResumption) {
- // Test that when provided with CachedNetworkParameters and opted in to the
- // bandwidth resumption experiment, that the TcpCubicSender sets initial CWND
- // appropriately.
-
- // Set some common values.
- CachedNetworkParameters cached_network_params;
- const QuicPacketCount kNumberOfPackets = 123;
- const int kBandwidthEstimateBytesPerSecond =
- kNumberOfPackets * kDefaultTCPMSS;
- cached_network_params.set_bandwidth_estimate_bytes_per_second(
- kBandwidthEstimateBytesPerSecond);
- cached_network_params.set_min_rtt_ms(1000);
-
- // Make sure that a bandwidth estimate results in a changed CWND.
- cached_network_params.set_timestamp(clock_.WallNow().ToUNIXSeconds() -
- (kNumSecondsPerHour - 1));
- sender_->ResumeConnectionState(cached_network_params, false);
- EXPECT_EQ(kNumberOfPackets * kDefaultTCPMSS, sender_->GetCongestionWindow());
-
- // Resumed CWND is limited to be in a sensible range.
- cached_network_params.set_bandwidth_estimate_bytes_per_second(
- (kMaxCongestionWindowPackets + 1) * kDefaultTCPMSS);
- sender_->ResumeConnectionState(cached_network_params, false);
- EXPECT_EQ(kMaxCongestionWindowPackets * kDefaultTCPMSS,
- sender_->GetCongestionWindow());
-
- if (FLAGS_quic_no_lower_bw_resumption_limit) {
- // Resume with an illegal value of 0 and verify the server uses 1 instead.
- cached_network_params.set_bandwidth_estimate_bytes_per_second(0);
- sender_->ResumeConnectionState(cached_network_params, false);
- EXPECT_EQ(sender_->min_congestion_window(), sender_->GetCongestionWindow());
- } else {
- cached_network_params.set_bandwidth_estimate_bytes_per_second(
- (kMinCongestionWindowForBandwidthResumption - 1) * kDefaultTCPMSS);
- sender_->ResumeConnectionState(cached_network_params, false);
- EXPECT_EQ(kMinCongestionWindowForBandwidthResumption * kDefaultTCPMSS,
- sender_->GetCongestionWindow());
- }
-
- // Resume to the max value.
- cached_network_params.set_max_bandwidth_estimate_bytes_per_second(
- kMaxCongestionWindowPackets * kDefaultTCPMSS);
- sender_->ResumeConnectionState(cached_network_params, true);
- EXPECT_EQ(kMaxCongestionWindowPackets * kDefaultTCPMSS,
- sender_->GetCongestionWindow());
-}
-
-TEST_F(TcpCubicSenderBytesTest, PaceBelowCWND) {
- QuicConfig config;
-
- // Verify that kCOPT: kMIN4 forces the min CWND to 1 packet, but allows up
- // to 4 to be sent.
- QuicTagVector options;
- options.push_back(kMIN4);
- QuicConfigPeer::SetReceivedConnectionOptions(&config, options);
- sender_->SetFromConfig(config, Perspective::IS_SERVER);
- sender_->OnRetransmissionTimeout(true);
- EXPECT_EQ(kDefaultTCPMSS, sender_->GetCongestionWindow());
- EXPECT_TRUE(
- sender_->TimeUntilSend(QuicTime::Zero(), kDefaultTCPMSS).IsZero());
- EXPECT_TRUE(
- sender_->TimeUntilSend(QuicTime::Zero(), 2 * kDefaultTCPMSS).IsZero());
- EXPECT_TRUE(
- sender_->TimeUntilSend(QuicTime::Zero(), 3 * kDefaultTCPMSS).IsZero());
- EXPECT_FALSE(
- sender_->TimeUntilSend(QuicTime::Zero(), 4 * kDefaultTCPMSS).IsZero());
-}
-
-TEST_F(TcpCubicSenderBytesTest, NoPRR) {
- QuicTime::Delta rtt = QuicTime::Delta::FromMilliseconds(100);
- sender_->rtt_stats_.UpdateRtt(rtt, QuicTime::Delta::Zero(), QuicTime::Zero());
-
- sender_->SetNumEmulatedConnections(1);
- // Verify that kCOPT: kNPRR allows all packets to be sent, even if only one
- // ack has been received.
- QuicTagVector options;
- options.push_back(kNPRR);
- QuicConfig config;
- QuicConfigPeer::SetReceivedConnectionOptions(&config, options);
- sender_->SetFromConfig(config, Perspective::IS_SERVER);
- SendAvailableSendWindow();
- LoseNPackets(9);
- AckNPackets(1);
-
- // We should now have fallen out of slow start with a reduced window.
- EXPECT_EQ(kRenoBeta * kDefaultWindowTCP, sender_->GetCongestionWindow());
- const QuicPacketCount window_in_packets =
- kRenoBeta * kDefaultWindowTCP / kDefaultTCPMSS;
- const QuicBandwidth expected_pacing_rate =
- QuicBandwidth::FromBytesAndTimeDelta(kRenoBeta * kDefaultWindowTCP,
- sender_->rtt_stats_.smoothed_rtt());
- EXPECT_EQ(expected_pacing_rate, sender_->PacingRate(0));
- EXPECT_EQ(window_in_packets,
- static_cast<uint64_t>(SendAvailableSendWindow()));
- EXPECT_EQ(expected_pacing_rate,
- sender_->PacingRate(kRenoBeta * kDefaultWindowTCP));
-}
-
-TEST_F(TcpCubicSenderBytesTest, PaceSlowerAboveCwnd) {
- ValueRestore<bool> old_flag(&FLAGS_quic_rate_based_sending, true);
- QuicTime::Delta rtt(QuicTime::Delta::FromMilliseconds(60));
- sender_->rtt_stats_.UpdateRtt(rtt, QuicTime::Delta::Zero(), clock_.Now());
-
- QuicConfig config;
- QuicTagVector options;
- options.push_back(kRATE);
- QuicConfigPeer::SetReceivedConnectionOptions(&config, options);
- sender_->SetFromConfig(config, Perspective::IS_SERVER);
- EXPECT_EQ(10 * kDefaultTCPMSS, sender_->GetCongestionWindow());
- sender_->SetNumEmulatedConnections(1);
- // Lose a packet to exit slow start.
- LoseNPackets(1);
- const QuicPacketCount cwnd = 7;
- EXPECT_EQ(cwnd * kDefaultTCPMSS, sender_->GetCongestionWindow());
-
- EXPECT_TRUE(
- sender_->TimeUntilSend(QuicTime::Zero(), kDefaultTCPMSS).IsZero());
- EXPECT_EQ(
- sender_->PacingRate(kDefaultTCPMSS),
- QuicBandwidth::FromBytesAndTimeDelta(7 * kDefaultTCPMSS, rtt) * 1.25);
- for (QuicPacketCount i = cwnd + 1; i < 1.5 * cwnd; ++i) {
- EXPECT_TRUE(
- sender_->TimeUntilSend(QuicTime::Zero(), i * kDefaultTCPMSS).IsZero());
- EXPECT_EQ(sender_->PacingRate(i * kDefaultTCPMSS),
- QuicBandwidth::FromBytesAndTimeDelta(cwnd * kDefaultTCPMSS, rtt) *
- 0.75);
- }
- EXPECT_FALSE(
- sender_->TimeUntilSend(QuicTime::Zero(), 11 * kDefaultTCPMSS).IsZero());
-}
-
-TEST_F(TcpCubicSenderBytesTest, ResetAfterConnectionMigration) {
- // Starts from slow start.
- sender_->SetNumEmulatedConnections(1);
- const int kNumberOfAcks = 10;
- for (int i = 0; i < kNumberOfAcks; ++i) {
- // Send our full send window.
- SendAvailableSendWindow();
- AckNPackets(2);
- }
- SendAvailableSendWindow();
- QuicByteCount expected_send_window =
- kDefaultWindowTCP + (kDefaultTCPMSS * 2 * kNumberOfAcks);
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
-
- // Loses a packet to exit slow start.
- LoseNPackets(1);
-
- // We should now have fallen out of slow start with a reduced window. Slow
- // start threshold is also updated.
- expected_send_window *= kRenoBeta;
- EXPECT_EQ(expected_send_window, sender_->GetCongestionWindow());
- EXPECT_EQ(expected_send_window, sender_->GetSlowStartThreshold());
-
- // Resets cwnd and slow start threshold on connection migrations.
- sender_->OnConnectionMigration();
- EXPECT_EQ(kDefaultWindowTCP, sender_->GetCongestionWindow());
- EXPECT_EQ(kMaxCongestionWindowPackets * kDefaultTCPMSS,
- sender_->GetSlowStartThreshold());
- EXPECT_FALSE(sender_->hybrid_slow_start().started());
-}
-
-TEST_F(TcpCubicSenderBytesTest, DefaultMaxCwnd) {
- RttStats rtt_stats;
- QuicConnectionStats stats;
- std::unique_ptr<SendAlgorithmInterface> sender(SendAlgorithmInterface::Create(
- &clock_, &rtt_stats, kCubicBytes, &stats, kInitialCongestionWindow));
-
- SendAlgorithmInterface::CongestionVector acked_packets;
- SendAlgorithmInterface::CongestionVector missing_packets;
- for (uint64_t i = 1; i < kDefaultMaxCongestionWindowPackets; ++i) {
- acked_packets.clear();
- acked_packets.push_back(std::make_pair(i, 1350));
- sender->OnCongestionEvent(true, sender->GetCongestionWindow(),
- acked_packets, missing_packets);
- }
- EXPECT_EQ(kDefaultMaxCongestionWindowPackets,
- sender->GetCongestionWindow() / kDefaultTCPMSS);
-}
-
-} // namespace test
-} // namespace net
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