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Side by Side Diff: net/quic/core/congestion_control/prr_sender.cc

Issue 2867693004: Snapshot of all changes to get jumbo in blink and content.
Patch Set: Exclude certain files from jumbo because of a Windows problem Created 3 years, 3 months ago
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1 // Copyright (c) 2014 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2014 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/prr_sender.h" 5 #include "net/quic/core/congestion_control/prr_sender.h"
6 6
7 #include "net/quic/core/quic_packets.h" 7 #include "net/quic/core/quic_packets.h"
8 8
9 namespace net { 9 namespace net {
10 10
11 namespace { 11 namespace {
12 // Constant based on TCP defaults. 12 // Constant based on TCP defaults.
13 const QuicByteCount kMaxSegmentSize = kDefaultTCPMSS; 13 const QuicByteCount kMaxQuicSegmentSize = kDefaultTCPMSS;
14 } // namespace 14 } // namespace
15 15
16 PrrSender::PrrSender() 16 PrrSender::PrrSender()
17 : bytes_sent_since_loss_(0), 17 : bytes_sent_since_loss_(0),
18 bytes_delivered_since_loss_(0), 18 bytes_delivered_since_loss_(0),
19 ack_count_since_loss_(0), 19 ack_count_since_loss_(0),
20 bytes_in_flight_before_loss_(0) {} 20 bytes_in_flight_before_loss_(0) {}
21 21
22 void PrrSender::OnPacketSent(QuicByteCount sent_bytes) { 22 void PrrSender::OnPacketSent(QuicByteCount sent_bytes) {
23 bytes_sent_since_loss_ += sent_bytes; 23 bytes_sent_since_loss_ += sent_bytes;
(...skipping 12 matching lines...) Expand all
36 } 36 }
37 37
38 QuicTime::Delta PrrSender::TimeUntilSend( 38 QuicTime::Delta PrrSender::TimeUntilSend(
39 QuicByteCount congestion_window, 39 QuicByteCount congestion_window,
40 QuicByteCount bytes_in_flight, 40 QuicByteCount bytes_in_flight,
41 QuicByteCount slowstart_threshold) const { 41 QuicByteCount slowstart_threshold) const {
42 // if (FLAGS_?? && bytes_in_flight < congestion_window) { 42 // if (FLAGS_?? && bytes_in_flight < congestion_window) {
43 // return QuicTime::Delta::Zero(); 43 // return QuicTime::Delta::Zero();
44 // } 44 // }
45 // Return QuicTime::Zero In order to ensure limited transmit always works. 45 // Return QuicTime::Zero In order to ensure limited transmit always works.
46 if (bytes_sent_since_loss_ == 0 || bytes_in_flight < kMaxSegmentSize) { 46 if (bytes_sent_since_loss_ == 0 || bytes_in_flight < kMaxQuicSegmentSize) {
47 return QuicTime::Delta::Zero(); 47 return QuicTime::Delta::Zero();
48 } 48 }
49 if (congestion_window > bytes_in_flight) { 49 if (congestion_window > bytes_in_flight) {
50 // During PRR-SSRB, limit outgoing packets to 1 extra MSS per ack, instead 50 // During PRR-SSRB, limit outgoing packets to 1 extra MSS per ack, instead
51 // of sending the entire available window. This prevents burst retransmits 51 // of sending the entire available window. This prevents burst retransmits
52 // when more packets are lost than the CWND reduction. 52 // when more packets are lost than the CWND reduction.
53 // limit = MAX(prr_delivered - prr_out, DeliveredData) + MSS 53 // limit = MAX(prr_delivered - prr_out, DeliveredData) + MSS
54 if (bytes_delivered_since_loss_ + ack_count_since_loss_ * kMaxSegmentSize <= 54 if (bytes_delivered_since_loss_ + ack_count_since_loss_ * kMaxQuicSegmentSiz e <=
55 bytes_sent_since_loss_) { 55 bytes_sent_since_loss_) {
56 return QuicTime::Delta::Infinite(); 56 return QuicTime::Delta::Infinite();
57 } 57 }
58 return QuicTime::Delta::Zero(); 58 return QuicTime::Delta::Zero();
59 } 59 }
60 // Implement Proportional Rate Reduction (RFC6937). 60 // Implement Proportional Rate Reduction (RFC6937).
61 // Checks a simplified version of the PRR formula that doesn't use division: 61 // Checks a simplified version of the PRR formula that doesn't use division:
62 // AvailableSendWindow = 62 // AvailableSendWindow =
63 // CEIL(prr_delivered * ssthresh / BytesInFlightAtLoss) - prr_sent 63 // CEIL(prr_delivered * ssthresh / BytesInFlightAtLoss) - prr_sent
64 if (bytes_delivered_since_loss_ * slowstart_threshold > 64 if (bytes_delivered_since_loss_ * slowstart_threshold >
65 bytes_sent_since_loss_ * bytes_in_flight_before_loss_) { 65 bytes_sent_since_loss_ * bytes_in_flight_before_loss_) {
66 return QuicTime::Delta::Zero(); 66 return QuicTime::Delta::Zero();
67 } 67 }
68 return QuicTime::Delta::Infinite(); 68 return QuicTime::Delta::Infinite();
69 } 69 }
70 70
71 } // namespace net 71 } // namespace net
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