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Diffstat (limited to 'chromium/net/third_party/quiche/src/quic/core/congestion_control/prr_sender_test.cc')
-rw-r--r-- | chromium/net/third_party/quiche/src/quic/core/congestion_control/prr_sender_test.cc | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/chromium/net/third_party/quiche/src/quic/core/congestion_control/prr_sender_test.cc b/chromium/net/third_party/quiche/src/quic/core/congestion_control/prr_sender_test.cc new file mode 100644 index 00000000000..45910659880 --- /dev/null +++ b/chromium/net/third_party/quiche/src/quic/core/congestion_control/prr_sender_test.cc @@ -0,0 +1,123 @@ +// Copyright (c) 2014 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/third_party/quiche/src/quic/core/congestion_control/prr_sender.h" + +#include <algorithm> + +#include "net/third_party/quiche/src/quic/core/crypto/crypto_protocol.h" +#include "net/third_party/quiche/src/quic/core/quic_constants.h" +#include "net/third_party/quiche/src/quic/platform/api/quic_test.h" + +namespace quic { +namespace test { + +namespace { +// Constant based on TCP defaults. +const QuicByteCount kMaxSegmentSize = kDefaultTCPMSS; +} // namespace + +class PrrSenderTest : public QuicTest {}; + +TEST_F(PrrSenderTest, SingleLossResultsInSendOnEveryOtherAck) { + PrrSender prr; + QuicPacketCount num_packets_in_flight = 50; + QuicByteCount bytes_in_flight = num_packets_in_flight * kMaxSegmentSize; + const QuicPacketCount ssthresh_after_loss = num_packets_in_flight / 2; + const QuicByteCount congestion_window = ssthresh_after_loss * kMaxSegmentSize; + + prr.OnPacketLost(bytes_in_flight); + // Ack a packet. PRR allows one packet to leave immediately. + prr.OnPacketAcked(kMaxSegmentSize); + bytes_in_flight -= kMaxSegmentSize; + EXPECT_TRUE(prr.CanSend(congestion_window, bytes_in_flight, + ssthresh_after_loss * kMaxSegmentSize)); + // Send retransmission. + prr.OnPacketSent(kMaxSegmentSize); + // PRR shouldn't allow sending any more packets. + EXPECT_FALSE(prr.CanSend(congestion_window, bytes_in_flight, + ssthresh_after_loss * kMaxSegmentSize)); + + // One packet is lost, and one ack was consumed above. PRR now paces + // transmissions through the remaining 48 acks. PRR will alternatively + // disallow and allow a packet to be sent in response to an ack. + for (uint64_t i = 0; i < ssthresh_after_loss - 1; ++i) { + // Ack a packet. PRR shouldn't allow sending a packet in response. + prr.OnPacketAcked(kMaxSegmentSize); + bytes_in_flight -= kMaxSegmentSize; + EXPECT_FALSE(prr.CanSend(congestion_window, bytes_in_flight, + ssthresh_after_loss * kMaxSegmentSize)); + // Ack another packet. PRR should now allow sending a packet in response. + prr.OnPacketAcked(kMaxSegmentSize); + bytes_in_flight -= kMaxSegmentSize; + EXPECT_TRUE(prr.CanSend(congestion_window, bytes_in_flight, + ssthresh_after_loss * kMaxSegmentSize)); + // Send a packet in response. + prr.OnPacketSent(kMaxSegmentSize); + bytes_in_flight += kMaxSegmentSize; + } + + // Since bytes_in_flight is now equal to congestion_window, PRR now maintains + // packet conservation, allowing one packet to be sent in response to an ack. + EXPECT_EQ(congestion_window, bytes_in_flight); + for (int i = 0; i < 10; ++i) { + // Ack a packet. + prr.OnPacketAcked(kMaxSegmentSize); + bytes_in_flight -= kMaxSegmentSize; + EXPECT_TRUE(prr.CanSend(congestion_window, bytes_in_flight, + ssthresh_after_loss * kMaxSegmentSize)); + // Send a packet in response, since PRR allows it. + prr.OnPacketSent(kMaxSegmentSize); + bytes_in_flight += kMaxSegmentSize; + + // Since bytes_in_flight is equal to the congestion_window, + // PRR disallows sending. + EXPECT_EQ(congestion_window, bytes_in_flight); + EXPECT_FALSE(prr.CanSend(congestion_window, bytes_in_flight, + ssthresh_after_loss * kMaxSegmentSize)); + } +} + +TEST_F(PrrSenderTest, BurstLossResultsInSlowStart) { + PrrSender prr; + QuicByteCount bytes_in_flight = 20 * kMaxSegmentSize; + const QuicPacketCount num_packets_lost = 13; + const QuicPacketCount ssthresh_after_loss = 10; + const QuicByteCount congestion_window = ssthresh_after_loss * kMaxSegmentSize; + + // Lose 13 packets. + bytes_in_flight -= num_packets_lost * kMaxSegmentSize; + prr.OnPacketLost(bytes_in_flight); + + // PRR-SSRB will allow the following 3 acks to send up to 2 packets. + for (int i = 0; i < 3; ++i) { + prr.OnPacketAcked(kMaxSegmentSize); + bytes_in_flight -= kMaxSegmentSize; + // PRR-SSRB should allow two packets to be sent. + for (int j = 0; j < 2; ++j) { + EXPECT_TRUE(prr.CanSend(congestion_window, bytes_in_flight, + ssthresh_after_loss * kMaxSegmentSize)); + // Send a packet in response. + prr.OnPacketSent(kMaxSegmentSize); + bytes_in_flight += kMaxSegmentSize; + } + // PRR should allow no more than 2 packets in response to an ack. + EXPECT_FALSE(prr.CanSend(congestion_window, bytes_in_flight, + ssthresh_after_loss * kMaxSegmentSize)); + } + + // Out of SSRB mode, PRR allows one send in response to each ack. + for (int i = 0; i < 10; ++i) { + prr.OnPacketAcked(kMaxSegmentSize); + bytes_in_flight -= kMaxSegmentSize; + EXPECT_TRUE(prr.CanSend(congestion_window, bytes_in_flight, + ssthresh_after_loss * kMaxSegmentSize)); + // Send a packet in response. + prr.OnPacketSent(kMaxSegmentSize); + bytes_in_flight += kMaxSegmentSize; + } +} + +} // namespace test +} // namespace quic |