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 = true;
  43
  44 // If true, then the source address tokens generated for QUIC connects will
  45 // store multiple addresses.
  46 bool FLAGS_quic_use_multiple_address_in_source_tokens = false;
  47
  48 // If true, attach QuicAckNotifiers to packets rather than individual stream
  49 // frames.
  50 bool FLAGS_quic_attach_ack_notifiers_to_packets = true;
  51
  52 // Time period for which a given connection_id should live in the time-wait
  53 // state.
  54 int64 FLAGS_quic_time_wait_list_seconds = 5;
  55
  56 // Currently, this number is quite conservative.  The max QPS limit for an
  57 // individual server silo is currently set to 1000 qps, though the actual max
  58 // that we see in the wild is closer to 450 qps. Regardless, this means that the
  59 // longest time-wait list we should see is 5 seconds * 1000 qps = 5000.  If we
  60 // allow for an order of magnitude leeway, we have 50000.
  61 //
  62 // Maximum number of connections on the time-wait list. A negative value implies
  63 // no configured limit.
  64 int64 FLAGS_quic_time_wait_list_max_connections = 50000;
  65
  66 // If true, limit the number of connections on the quic time-wait list using a
  67 // flag.
  68 bool FLAGS_quic_limit_time_wait_list_size = true;
  69
  70 // Use small QUIC packet sizes by default.
  71 bool FLAGS_quic_small_default_packet_size = true;