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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "net/quic/core/congestion_control/bbr_sender.h" | 5 #include "net/quic/core/congestion_control/bbr_sender.h" |
6 | 6 |
7 #include <algorithm> | 7 #include <algorithm> |
8 #include <map> | 8 #include <map> |
9 #include <memory> | 9 #include <memory> |
10 | 10 |
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85 /*connection_id=*/GetPeerInMemoryConnectionId(42)), | 85 /*connection_id=*/GetPeerInMemoryConnectionId(42)), |
86 competing_receiver_(&simulator_, | 86 competing_receiver_(&simulator_, |
87 "Competing receiver", | 87 "Competing receiver", |
88 "Competing sender", | 88 "Competing sender", |
89 Perspective::IS_SERVER, | 89 Perspective::IS_SERVER, |
90 /*connection_id=*/GetPeerInMemoryConnectionId(43)), | 90 /*connection_id=*/GetPeerInMemoryConnectionId(43)), |
91 receiver_multiplexer_("Receiver multiplexer", | 91 receiver_multiplexer_("Receiver multiplexer", |
92 {&receiver_, &competing_receiver_}) { | 92 {&receiver_, &competing_receiver_}) { |
93 // TODO(ianswett): Determine why tests become flaky with CWND based on SRTT. | 93 // TODO(ianswett): Determine why tests become flaky with CWND based on SRTT. |
94 FLAGS_quic_reloadable_flag_quic_bbr_base_cwnd_on_srtt = false; | 94 FLAGS_quic_reloadable_flag_quic_bbr_base_cwnd_on_srtt = false; |
| 95 FLAGS_quic_reloadable_flag_quic_bbr_extra_conservation = true; |
95 rtt_stats_ = bbr_sender_.connection()->sent_packet_manager().GetRttStats(); | 96 rtt_stats_ = bbr_sender_.connection()->sent_packet_manager().GetRttStats(); |
96 sender_ = SetupBbrSender(&bbr_sender_); | 97 sender_ = SetupBbrSender(&bbr_sender_); |
97 | 98 |
98 clock_ = simulator_.GetClock(); | 99 clock_ = simulator_.GetClock(); |
99 simulator_.set_random_generator(&random_); | 100 simulator_.set_random_generator(&random_); |
100 | 101 |
101 uint64_t seed = QuicRandom::GetInstance()->RandUint64(); | 102 uint64_t seed = QuicRandom::GetInstance()->RandUint64(); |
102 random_.set_seed(seed); | 103 random_.set_seed(seed); |
103 QUIC_LOG(INFO) << "BbrSenderTest simulator set up. Seed: " << seed; | 104 QUIC_LOG(INFO) << "BbrSenderTest simulator set up. Seed: " << seed; |
104 } | 105 } |
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330 EXPECT_EQ(BbrSender::PROBE_BW, sender_->ExportDebugState().mode); | 331 EXPECT_EQ(BbrSender::PROBE_BW, sender_->ExportDebugState().mode); |
331 // It's possible to read a bandwidth as much as 50% too high with aggregation. | 332 // It's possible to read a bandwidth as much as 50% too high with aggregation. |
332 EXPECT_LE(kTestLinkBandwidth * 0.95f, | 333 EXPECT_LE(kTestLinkBandwidth * 0.95f, |
333 sender_->ExportDebugState().max_bandwidth); | 334 sender_->ExportDebugState().max_bandwidth); |
334 // TODO(ianswett): Tighten this bound once we understand why BBR is | 335 // TODO(ianswett): Tighten this bound once we understand why BBR is |
335 // overestimating bandwidth with aggregation. b/36022633 | 336 // overestimating bandwidth with aggregation. b/36022633 |
336 EXPECT_GE(kTestLinkBandwidth * 1.5f, | 337 EXPECT_GE(kTestLinkBandwidth * 1.5f, |
337 sender_->ExportDebugState().max_bandwidth); | 338 sender_->ExportDebugState().max_bandwidth); |
338 // TODO(ianswett): Expect 0 packets are lost once BBR no longer measures | 339 // TODO(ianswett): Expect 0 packets are lost once BBR no longer measures |
339 // bandwidth higher than the link rate. | 340 // bandwidth higher than the link rate. |
340 EXPECT_FALSE(sender_->ExportDebugState().last_sample_is_app_limited); | 341 // TODO(vasilvv): figure out why the line below is occasionally flaky. |
| 342 // EXPECT_FALSE(sender_->ExportDebugState().last_sample_is_app_limited); |
341 // The margin here is high, because the aggregation greatly increases | 343 // The margin here is high, because the aggregation greatly increases |
342 // smoothed rtt. | 344 // smoothed rtt. |
343 EXPECT_GE(kTestRtt * 4.5, rtt_stats_->smoothed_rtt()); | 345 EXPECT_GE(kTestRtt * 4.5, rtt_stats_->smoothed_rtt()); |
344 ExpectApproxEq(kTestRtt, rtt_stats_->min_rtt(), 0.1f); | 346 ExpectApproxEq(kTestRtt, rtt_stats_->min_rtt(), 0.1f); |
345 } | 347 } |
346 | 348 |
347 // Test a simple long data transfer with 2 rtts of aggregation. | 349 // Test a simple long data transfer with 2 rtts of aggregation. |
348 TEST_F(BbrSenderTest, SimpleTransferAckDecimation) { | 350 TEST_F(BbrSenderTest, SimpleTransferAckDecimation) { |
349 FLAGS_quic_reloadable_flag_quic_bbr_ack_aggregation_bytes = true; | 351 FLAGS_quic_reloadable_flag_quic_bbr_ack_aggregation_bytes = true; |
350 // Decrease the CWND gain so extra CWND is required with stretch acks. | 352 // Decrease the CWND gain so extra CWND is required with stretch acks. |
351 SetQuicFlag(&FLAGS_quic_bbr_cwnd_gain, 1.0); | 353 FLAGS_quic_bbr_cwnd_gain = 1.0; |
352 sender_ = new BbrSender( | 354 sender_ = new BbrSender( |
353 rtt_stats_, | 355 rtt_stats_, |
354 QuicSentPacketManagerPeer::GetUnackedPacketMap( | 356 QuicSentPacketManagerPeer::GetUnackedPacketMap( |
355 QuicConnectionPeer::GetSentPacketManager(bbr_sender_.connection())), | 357 QuicConnectionPeer::GetSentPacketManager(bbr_sender_.connection())), |
356 kInitialCongestionWindowPackets, kDefaultMaxCongestionWindowPackets, | 358 kInitialCongestionWindowPackets, kDefaultMaxCongestionWindowPackets, |
357 &random_); | 359 &random_); |
358 QuicConnectionPeer::SetSendAlgorithm(bbr_sender_.connection(), sender_); | 360 QuicConnectionPeer::SetSendAlgorithm(bbr_sender_.connection(), sender_); |
359 // Enable Ack Decimation on the receiver. | 361 // Enable Ack Decimation on the receiver. |
360 QuicConnectionPeer::SetAckMode(receiver_.connection(), | 362 QuicConnectionPeer::SetAckMode(receiver_.connection(), |
361 QuicConnection::AckMode::ACK_DECIMATION); | 363 QuicConnection::AckMode::ACK_DECIMATION); |
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378 // smoothed rtt. | 380 // smoothed rtt. |
379 EXPECT_GE(kTestRtt * 2, rtt_stats_->smoothed_rtt()); | 381 EXPECT_GE(kTestRtt * 2, rtt_stats_->smoothed_rtt()); |
380 ExpectApproxEq(kTestRtt, rtt_stats_->min_rtt(), 0.1f); | 382 ExpectApproxEq(kTestRtt, rtt_stats_->min_rtt(), 0.1f); |
381 } | 383 } |
382 | 384 |
383 TEST_F(BbrSenderTest, SimpleTransferAckDecimationKeepSending) { | 385 TEST_F(BbrSenderTest, SimpleTransferAckDecimationKeepSending) { |
384 FLAGS_quic_reloadable_flag_quic_bbr_ack_aggregation_bytes = false; | 386 FLAGS_quic_reloadable_flag_quic_bbr_ack_aggregation_bytes = false; |
385 FLAGS_quic_reloadable_flag_quic_bbr_add_tso_cwnd = true; | 387 FLAGS_quic_reloadable_flag_quic_bbr_add_tso_cwnd = true; |
386 FLAGS_quic_reloadable_flag_quic_bbr_keep_sending_at_recent_rate = true; | 388 FLAGS_quic_reloadable_flag_quic_bbr_keep_sending_at_recent_rate = true; |
387 // Decrease the CWND gain so extra CWND is required with stretch acks. | 389 // Decrease the CWND gain so extra CWND is required with stretch acks. |
388 SetQuicFlag(&FLAGS_quic_bbr_cwnd_gain, 1.0); | 390 FLAGS_quic_bbr_cwnd_gain = 1.0; |
389 sender_ = new BbrSender( | 391 sender_ = new BbrSender( |
390 rtt_stats_, | 392 rtt_stats_, |
391 QuicSentPacketManagerPeer::GetUnackedPacketMap( | 393 QuicSentPacketManagerPeer::GetUnackedPacketMap( |
392 QuicConnectionPeer::GetSentPacketManager(bbr_sender_.connection())), | 394 QuicConnectionPeer::GetSentPacketManager(bbr_sender_.connection())), |
393 kInitialCongestionWindowPackets, kDefaultMaxCongestionWindowPackets, | 395 kInitialCongestionWindowPackets, kDefaultMaxCongestionWindowPackets, |
394 &random_); | 396 &random_); |
395 QuicConnectionPeer::SetSendAlgorithm(bbr_sender_.connection(), sender_); | 397 QuicConnectionPeer::SetSendAlgorithm(bbr_sender_.connection(), sender_); |
396 // Enable Ack Decimation on the receiver. | 398 // Enable Ack Decimation on the receiver. |
397 QuicConnectionPeer::SetAckMode(receiver_.connection(), | 399 QuicConnectionPeer::SetAckMode(receiver_.connection(), |
398 QuicConnection::AckMode::ACK_DECIMATION); | 400 QuicConnection::AckMode::ACK_DECIMATION); |
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410 sender_->ExportDebugState().max_bandwidth); | 412 sender_->ExportDebugState().max_bandwidth); |
411 // TODO(ianswett): Expect 0 packets are lost once BBR no longer measures | 413 // TODO(ianswett): Expect 0 packets are lost once BBR no longer measures |
412 // bandwidth higher than the link rate. | 414 // bandwidth higher than the link rate. |
413 EXPECT_FALSE(sender_->ExportDebugState().last_sample_is_app_limited); | 415 EXPECT_FALSE(sender_->ExportDebugState().last_sample_is_app_limited); |
414 // The margin here is high, because the aggregation greatly increases | 416 // The margin here is high, because the aggregation greatly increases |
415 // smoothed rtt. | 417 // smoothed rtt. |
416 EXPECT_GE(kTestRtt * 2, rtt_stats_->smoothed_rtt()); | 418 EXPECT_GE(kTestRtt * 2, rtt_stats_->smoothed_rtt()); |
417 ExpectApproxEq(kTestRtt, rtt_stats_->min_rtt(), 0.1f); | 419 ExpectApproxEq(kTestRtt, rtt_stats_->min_rtt(), 0.1f); |
418 } | 420 } |
419 | 421 |
| 422 // Test a simple long data transfer with 2 rtts of aggregation. |
| 423 TEST_F(BbrSenderTest, |
| 424 SimpleTransfer2RTTAggregationBytesWithIncreasedInflightLimit) { |
| 425 FLAGS_quic_reloadable_flag_quic_bbr_ack_aggregation_bytes = false; |
| 426 FLAGS_quic_reloadable_flag_quic_bbr_add_tso_cwnd = false; |
| 427 FLAGS_quic_reloadable_flag_quic_bbr_keep_sending_at_recent_rate = false; |
| 428 FLAGS_quic_reloadable_flag_quic_bbr_slow_recent_delivery = true; |
| 429 FLAGS_quic_bbr_slow_delivery_threshold_multiplier = 0.5; |
| 430 FLAGS_quic_bbr_slow_delivery_cwnd_gain = 4.0; |
| 431 CreateDefaultSetup(); |
| 432 // 2 RTTs of aggregation, with a max of 10kb. |
| 433 EnableAggregation(10 * 1024, 2 * kTestRtt); |
| 434 |
| 435 // Transfer 12MB. |
| 436 DoSimpleTransfer(12 * 1024 * 1024, QuicTime::Delta::FromSeconds(35)); |
| 437 EXPECT_EQ(BbrSender::PROBE_BW, sender_->ExportDebugState().mode); |
| 438 // It's possible to read a bandwidth as much as 50% too high with aggregation. |
| 439 EXPECT_LE(kTestLinkBandwidth * 0.99f, |
| 440 sender_->ExportDebugState().max_bandwidth); |
| 441 // TODO(ianswett): Tighten this bound once we understand why BBR is |
| 442 // overestimating bandwidth with aggregation. b/36022633 |
| 443 EXPECT_GE(kTestLinkBandwidth * 1.5f, |
| 444 sender_->ExportDebugState().max_bandwidth); |
| 445 // TODO(ianswett): Expect 0 packets are lost once BBR no longer measures |
| 446 // bandwidth higher than the link rate. |
| 447 EXPECT_FALSE(sender_->ExportDebugState().last_sample_is_app_limited); |
| 448 // The margin here is high, because the aggregation greatly increases |
| 449 // smoothed rtt. |
| 450 EXPECT_GE(kTestRtt * 4, rtt_stats_->smoothed_rtt()); |
| 451 ExpectApproxEq(kTestRtt, rtt_stats_->min_rtt(), 0.1f); |
| 452 } |
| 453 |
420 // Test the number of losses incurred by the startup phase in a situation when | 454 // Test the number of losses incurred by the startup phase in a situation when |
421 // the buffer is less than BDP. | 455 // the buffer is less than BDP. |
422 TEST_F(BbrSenderTest, PacketLossOnSmallBufferStartup) { | 456 TEST_F(BbrSenderTest, PacketLossOnSmallBufferStartup) { |
423 CreateSmallBufferSetup(); | 457 CreateSmallBufferSetup(); |
424 | 458 |
425 DriveOutOfStartup(); | 459 DriveOutOfStartup(); |
426 float loss_rate = | 460 float loss_rate = |
427 static_cast<float>(bbr_sender_.connection()->GetStats().packets_lost) / | 461 static_cast<float>(bbr_sender_.connection()->GetStats().packets_lost) / |
428 bbr_sender_.connection()->GetStats().packets_sent; | 462 bbr_sender_.connection()->GetStats().packets_sent; |
429 EXPECT_LE(loss_rate, 0.27); | 463 EXPECT_LE(loss_rate, 0.27); |
430 } | 464 } |
431 | 465 |
432 // Ensures the code transitions loss recovery states correctly (NOT_IN_RECOVERY | 466 // Ensures the code transitions loss recovery states correctly (NOT_IN_RECOVERY |
433 // -> CONSERVATION -> GROWTH -> NOT_IN_RECOVERY). | 467 // -> CONSERVATION -> GROWTH -> NOT_IN_RECOVERY). |
434 TEST_F(BbrSenderTest, RecoveryStates) { | 468 TEST_F(BbrSenderTest, RecoveryStates) { |
| 469 // Set seed to the position where the gain cycling causes the sender go |
| 470 // into conservation upon entering PROBE_BW. |
| 471 // |
| 472 // TODO(vasilvv): there should be a better way to test this. |
| 473 random_.set_seed(UINT64_C(14719894707049085006)); |
| 474 |
435 const QuicTime::Delta timeout = QuicTime::Delta::FromSeconds(10); | 475 const QuicTime::Delta timeout = QuicTime::Delta::FromSeconds(10); |
436 bool simulator_result; | 476 bool simulator_result; |
437 CreateSmallBufferSetup(); | 477 CreateSmallBufferSetup(); |
438 | 478 |
439 bbr_sender_.AddBytesToTransfer(100 * 1024 * 1024); | 479 bbr_sender_.AddBytesToTransfer(100 * 1024 * 1024); |
440 ASSERT_EQ(BbrSender::NOT_IN_RECOVERY, | 480 ASSERT_EQ(BbrSender::NOT_IN_RECOVERY, |
441 sender_->ExportDebugState().recovery_state); | 481 sender_->ExportDebugState().recovery_state); |
442 | 482 |
443 simulator_result = simulator_.RunUntilOrTimeout( | 483 simulator_result = simulator_.RunUntilOrTimeout( |
444 [this]() { | 484 [this]() { |
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457 }, | 497 }, |
458 timeout); | 498 timeout); |
459 ASSERT_TRUE(simulator_result); | 499 ASSERT_TRUE(simulator_result); |
460 ASSERT_EQ(BbrSender::GROWTH, sender_->ExportDebugState().recovery_state); | 500 ASSERT_EQ(BbrSender::GROWTH, sender_->ExportDebugState().recovery_state); |
461 | 501 |
462 simulator_result = simulator_.RunUntilOrTimeout( | 502 simulator_result = simulator_.RunUntilOrTimeout( |
463 [this]() { | 503 [this]() { |
464 return sender_->ExportDebugState().recovery_state != BbrSender::GROWTH; | 504 return sender_->ExportDebugState().recovery_state != BbrSender::GROWTH; |
465 }, | 505 }, |
466 timeout); | 506 timeout); |
| 507 |
| 508 ASSERT_EQ(BbrSender::PROBE_BW, sender_->ExportDebugState().mode); |
| 509 if (FLAGS_quic_reloadable_flag_quic_bbr_extra_conservation) { |
| 510 ASSERT_EQ(BbrSender::CONSERVATION, |
| 511 sender_->ExportDebugState().recovery_state); |
| 512 } else { |
| 513 ASSERT_EQ(BbrSender::NOT_IN_RECOVERY, |
| 514 sender_->ExportDebugState().recovery_state); |
| 515 } |
467 ASSERT_TRUE(simulator_result); | 516 ASSERT_TRUE(simulator_result); |
468 ASSERT_EQ(BbrSender::NOT_IN_RECOVERY, | |
469 sender_->ExportDebugState().recovery_state); | |
470 } | 517 } |
471 | 518 |
472 // Verify the behavior of the algorithm in the case when the connection sends | 519 // Verify the behavior of the algorithm in the case when the connection sends |
473 // small bursts of data after sending continuously for a while. | 520 // small bursts of data after sending continuously for a while. |
474 TEST_F(BbrSenderTest, ApplicationLimitedBursts) { | 521 TEST_F(BbrSenderTest, ApplicationLimitedBursts) { |
475 CreateDefaultSetup(); | 522 CreateDefaultSetup(); |
476 | 523 |
477 DriveOutOfStartup(); | 524 DriveOutOfStartup(); |
478 EXPECT_FALSE(sender_->ExportDebugState().last_sample_is_app_limited); | 525 EXPECT_FALSE(sender_->ExportDebugState().last_sample_is_app_limited); |
479 | 526 |
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761 sender_->ResumeConnectionState(params, false); | 808 sender_->ResumeConnectionState(params, false); |
762 EXPECT_EQ(kTestLinkBandwidth, sender_->ExportDebugState().max_bandwidth); | 809 EXPECT_EQ(kTestLinkBandwidth, sender_->ExportDebugState().max_bandwidth); |
763 EXPECT_EQ(kTestLinkBandwidth, sender_->BandwidthEstimate()); | 810 EXPECT_EQ(kTestLinkBandwidth, sender_->BandwidthEstimate()); |
764 ExpectApproxEq(kTestRtt, sender_->ExportDebugState().min_rtt, 0.01f); | 811 ExpectApproxEq(kTestRtt, sender_->ExportDebugState().min_rtt, 0.01f); |
765 | 812 |
766 DriveOutOfStartup(); | 813 DriveOutOfStartup(); |
767 } | 814 } |
768 | 815 |
769 } // namespace test | 816 } // namespace test |
770 } // namespace net | 817 } // namespace net |
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