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 // Time period for which a given connection_id should live in the time-wait
  29 // state.
  30 int64 FLAGS_quic_time_wait_list_seconds = 200;
  31
  32 // Currently, this number is quite conservative.  The max QPS limit for an
  33 // individual server silo is currently set to 1000 qps, though the actual max
  34 // that we see in the wild is closer to 450 qps.  Regardless, this means that
  35 // the longest time-wait list we should see is 200 seconds * 1000 qps = 200000.
  36 // Of course, there are usually many queries per QUIC connection, so we allow a
  37 // factor of 3 leeway.
  38 //
  39 // Maximum number of connections on the time-wait list. A negative value implies
  40 // no configured limit.
  41 int64 FLAGS_quic_time_wait_list_max_connections = 600000;
  42
  43 // Enables server-side support for QUIC stateless rejects.
  44 bool FLAGS_enable_quic_stateless_reject_support = true;
  45
  46 // If true, flow controller may grow the receive window size if necessary.
  47 bool FLAGS_quic_auto_tune_receive_window = true;
  48
  49 // Enables server-side path MTU discovery in QUIC.
  50 bool FLAGS_quic_do_path_mtu_discovery = true;
  51
  52 // Process QUIC frames as soon as they're parsed, instead of waiting for the
  53 // packet's parsing to complete.
  54 bool FLAGS_quic_process_frames_inline = true;
  55
  56 // Estimate that only 60% of QUIC's receive buffer is usable as opposed to 95%.
  57 bool FLAGS_quic_use_conservative_receive_buffer = true;
  58
  59 // Limits QUIC's max CWND to 200 packets.
  60 bool FLAGS_quic_limit_max_cwnd = true;
  61
  62 // If true, require handshake confirmation for QUIC connections, functionally
  63 // disabling 0-rtt handshakes.
  64 // TODO(rtenneti): Enable this flag after fixing tests.
  65 bool FLAGS_quic_require_handshake_confirmation = false;
  66
  67 // Disables special treatment of truncated acks, since older retransmissions are
  68 // proactively discarded in QUIC.
  69 bool FLAGS_quic_disable_truncated_ack_handling = true;
  70
  71 // If true, after a server silo receives a packet from a migrated QUIC
  72 // client, a GO_AWAY frame is sent to the client.
  73 bool FLAGS_send_goaway_after_client_migration = true;
  74
  75 // Close the connection instead of attempting to write a packet out of sequence
  76 // number order.
  77 bool FLAGS_quic_close_connection_out_of_order_sending = true;
  78
  79 // Allow QUIC packet writer to limit the MTU of the connection.
  80 bool FLAGS_quic_limit_mtu_by_writer = true;
  81
  82 // QUIC-specific flag. If true, Cubic's epoch is reset when the sender is
  83 // application-limited.
  84 bool FLAGS_reset_cubic_epoch_when_app_limited = true;