net/quic/quic_flags.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/quic/quic_flags.h"
   6
   7 bool FLAGS_quic_allow_oversized_packets_for_test = false;
   8
   9 // When true, the use time based loss detection instead of nack.
  10 bool FLAGS_quic_use_time_loss_detection = false;
  11
  12 // If true, it will return as soon as an error is detected while validating
  13 // CHLO.
  14 bool FLAGS_use_early_return_when_verifying_chlo = true;
  15
  16 // If true, QUIC connections will support FEC protection of data while sending
  17 // packets, to reduce latency of data delivery to the application. The client
  18 // must also request FEC protection for the server to use FEC.
  19 bool FLAGS_enable_quic_fec = false;
  20
  21 // When true, defaults to BBR congestion control instead of Cubic.
  22 bool FLAGS_quic_use_bbr_congestion_control = false;
  23
  24 // If true, QUIC BBR congestion control may be enabled via Finch and/or via QUIC
  25 // connection options.
  26 bool FLAGS_quic_allow_bbr = false;
  27
  28 // Do not flip this flag.  jokulik plans more testing and additional monitoring
  29 // before the flag can go the auto-flip process.
  30 //
  31 // If true, record the timestamp for the last sent new packet before the call to
  32 // WritePacket, rather than after in QUIC.
  33 bool FLAGS_quic_record_send_time_before_write = false;
  34
  35 // If true, enables the QUIC bandwidth resumption experiment (triggered by
  36 // Chrome/Finch).
  37 bool FLAGS_quic_enable_bandwidth_resumption_experiment = true;
  38
  39 // If true, QUIC congestion control will be paced.  If false, pacing may be
  40 // controlled by QUIC connection options in the config or by enabling BBR
  41 // congestion control.
  42 bool FLAGS_quic_enable_pacing = false;
  43
  44 // If true, the silent close option will be honored.
  45 bool FLAGS_quic_allow_silent_close = true;
  46
  47 // If true, use std::cbrt instead of custom cube root.
  48 bool FLAGS_quic_use_std_cbrt = true;
  49
  50 // If true, then the source address tokens generated for QUIC connects will
  51 // store multiple addresses.
  52 bool FLAGS_quic_use_multiple_address_in_source_tokens = false;
  53
  54 // If true, if min RTT and/or SRTT have not yet been set then initial RTT is
  55 // used to initialize them in a call to QuicConnection::GetStats.
  56 bool FLAGS_quic_use_initial_rtt_for_stats = true;
  57
  58 // If true, uses the last sent packet for the RTO timer instead of the earliest.
  59 bool FLAGS_quic_rto_uses_last_sent = true;
  60
  61 // If true, attach QuicAckNotifiers to packets rather than individual stream
  62 // frames.
  63 bool FLAGS_quic_attach_ack_notifiers_to_packets = true;
  64
  65 // If true, the AckNotifierManager is informed about new packets as soon as they
  66 // are serialized.
  67 bool FLAGS_quic_ack_notifier_informed_on_serialized = true;
  68
  69 // If true, QUIC will use the new RTO that waits until an ack arrives to adjust
  70 // the congestion window.
  71 bool FLAGS_quic_use_new_rto = true;
  72
  73 // Time period for which a given connection_id should live in the time-wait
  74 // state.
  75 int64 FLAGS_quic_time_wait_list_seconds = 5;
  76
  77 // Currently, this number is quite conservative.  The max QPS limit for an
  78 // individual server silo is currently set to 1000 qps, though the actual max
  79 // that we see in the wild is closer to 450 qps. Regardless, this means that the
  80 // longest time-wait list we should see is 5 seconds * 1000 qps = 5000.  If we
  81 // allow for an order of magnitude leeway, we have 50000.
  82 //
  83 // Maximum number of connections on the time-wait list. A negative value implies
  84 // no configured limit.
  85 int64 FLAGS_quic_time_wait_list_max_connections = 50000;
  86
  87 // If true, limit the number of connections on the quic time-wait list using a
  88 // flag.
  89 bool FLAGS_quic_limit_time_wait_list_size = true;