| // Copyright 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. |
| |
| // This file intentionally does not have header guards, it's included |
| // inside a macro to generate values. The following line silences a |
| // presubmit warning that would otherwise be triggered by this: |
| // no-include-guard-because-multiply-included |
| // NOLINT(build/header_guard) |
| |
| // This file contains the list of QUIC protocol flags. |
| |
| // Time period for which a given connection_id should live in the time-wait |
| // state. |
| QUIC_FLAG(int64_t, FLAGS_quic_time_wait_list_seconds, 200) |
| |
| // Currently, this number is quite conservative. The max QPS limit for an |
| // individual server silo is currently set to 1000 qps, though the actual max |
| // that we see in the wild is closer to 450 qps. Regardless, this means that |
| // the longest time-wait list we should see is 200 seconds * 1000 qps, 200000. |
| // Of course, there are usually many queries per QUIC connection, so we allow a |
| // factor of 3 leeway. |
| // |
| // Maximum number of connections on the time-wait list. A negative value implies |
| // no configured limit. |
| QUIC_FLAG(int64_t, FLAGS_quic_time_wait_list_max_connections, 600000) |
| |
| // If true, require handshake confirmation for QUIC connections, functionally |
| // disabling 0-rtt handshakes. |
| // TODO(rtenneti): Enable this flag after CryptoServerTest's are fixed. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_require_handshake_confirmation, |
| false) |
| |
| // If true, disable pacing in QUIC. |
| QUIC_FLAG(bool, FLAGS_quic_disable_pacing_for_perf_tests, false) |
| |
| // If true, enforce that QUIC CHLOs fit in one packet. |
| QUIC_FLAG(bool, FLAGS_quic_enforce_single_packet_chlo, true) |
| |
| // If true, allows packets to be buffered in anticipation of a future CHLO, and |
| // allow CHLO packets to be buffered until next iteration of the event loop. |
| QUIC_FLAG(bool, FLAGS_quic_allow_chlo_buffering, true) |
| |
| // If greater than zero, mean RTT variation is multiplied by the specified |
| // factor and added to the congestion window limit. |
| QUIC_FLAG(double, FLAGS_quic_bbr_rtt_variation_weight, 0.0f) |
| |
| // Congestion window gain for QUIC BBR during PROBE_BW phase. |
| QUIC_FLAG(double, FLAGS_quic_bbr_cwnd_gain, 2.0f) |
| |
| // When true, defaults to BBR congestion control instead of Cubic. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_default_to_bbr, false) |
| |
| // If true, use BBRv2 as the default congestion controller. |
| // Takes precedence over --quic_default_to_bbr. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_default_to_bbr_v2, false) |
| |
| // If buffered data in QUIC stream is less than this threshold, buffers all |
| // provided data or asks upper layer for more data. |
| QUIC_FLAG(uint32_t, FLAGS_quic_buffered_data_threshold, 8192u) |
| |
| // Max size of data slice in bytes for QUIC stream send buffer. |
| QUIC_FLAG(uint32_t, FLAGS_quic_send_buffer_max_data_slice_size, 4096u) |
| |
| // Anti-amplification factor. Before address validation, server will |
| // send no more than factor times bytes received. |
| QUIC_FLAG(int32_t, FLAGS_quic_anti_amplification_factor, 3) |
| |
| // When true, set the initial congestion control window from connection options |
| // in QuicSentPacketManager rather than TcpCubicSenderBytes. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_unified_iw_options, false) |
| |
| // Number of packets that the pacing sender allows in bursts during pacing. |
| QUIC_FLAG(int32_t, FLAGS_quic_lumpy_pacing_size, 2) |
| |
| // Congestion window fraction that the pacing sender allows in bursts during |
| // pacing. |
| QUIC_FLAG(double, FLAGS_quic_lumpy_pacing_cwnd_fraction, 0.25f) |
| |
| // Default enables QUIC ack decimation and adds a connection option to disable |
| // it. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_ack_decimation, true) |
| |
| // If true, QUIC offload pacing when using USPS as egress method. |
| QUIC_FLAG(bool, FLAGS_quic_restart_flag_quic_offload_pacing_to_usps2, false) |
| |
| // Max time that QUIC can pace packets into the future in ms. |
| QUIC_FLAG(int32_t, FLAGS_quic_max_pace_time_into_future_ms, 10) |
| |
| // Smoothed RTT fraction that a connection can pace packets into the future. |
| QUIC_FLAG(double, FLAGS_quic_pace_time_into_future_srtt_fraction, 0.125f) |
| |
| // Mechanism to override version label and ALPN for IETF interop. |
| QUIC_FLAG(int32_t, FLAGS_quic_ietf_draft_version, 0) |
| |
| // If true, stop resetting ideal_next_packet_send_time_ in pacing sender. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_donot_reset_ideal_next_packet_send_time, |
| false) |
| |
| // When true and the BBR9 connection option is present, BBR only considers |
| // bandwidth samples app-limited if they're not filling the pipe. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_flexible_app_limited, false) |
| |
| // When the STMP connection option is sent by the client, timestamps in the QUIC |
| // ACK frame are sent and processed. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_send_timestamps, false) |
| |
| // When in STARTUP and recovery, do not add bytes_acked to QUIC BBR's CWND in |
| // CalculateCongestionWindow() |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_bbr_no_bytes_acked_in_startup_recovery, |
| false) |
| |
| // If true and using Leto for QUIC shared-key calculations, GFE will react to a |
| // failure to contact Leto by sending a REJ containing a fallback ServerConfig, |
| // allowing the client to continue the handshake. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_send_quic_fallback_server_config_on_leto_error, |
| false) |
| |
| // If true, GFE will not request private keys when fetching QUIC ServerConfigs |
| // from Leto. |
| QUIC_FLAG(bool, |
| FLAGS_quic_restart_flag_dont_fetch_quic_private_keys_from_leto, |
| false) |
| |
| // In v44 and above, where STOP_WAITING is never sent, close the connection if |
| // it's received. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_do_not_accept_stop_waiting, |
| false) |
| |
| // If true, set burst token to 2 in cwnd bootstrapping experiment. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_conservative_bursts, false) |
| |
| // If true, export number of packets written per write operation histogram.") |
| QUIC_FLAG(bool, FLAGS_quic_export_server_num_packets_per_write_histogram, false) |
| |
| // If true, uses conservative cwnd gain and pacing gain. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_conservative_cwnd_and_pacing_gains, |
| false) |
| |
| // If true, use predictable version negotiation versions. |
| QUIC_FLAG(bool, FLAGS_quic_disable_version_negotiation_grease_randomness, false) |
| |
| // Maximum number of tracked packets. |
| QUIC_FLAG(int64_t, FLAGS_quic_max_tracked_packet_count, 10000) |
| |
| // If true, HTTP request header names sent from QuicSpdyClientBase(and |
| // descendents) will be automatically converted to lower case. |
| QUIC_FLAG(bool, FLAGS_quic_client_convert_http_header_name_to_lowercase, true) |
| |
| // If true, allow client to enable BBRv2 on server via connection option 'B2ON'. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_allow_client_enabled_bbr_v2, |
| false) |
| |
| // If true, QuicFramer::WriteClientVersionNegotiationProbePacket uses |
| // length-prefixed connection IDs. |
| QUIC_FLAG(bool, FLAGS_quic_prober_uses_length_prefixed_connection_ids, false) |
| |
| // The maximum amount of CRYPTO frame data that can be buffered. |
| QUIC_FLAG(int32_t, FLAGS_quic_max_buffered_crypto_bytes, 16 * 1024) |
| |
| // If the bandwidth during ack aggregation is smaller than (estimated |
| // bandwidth * this flag), consider the current aggregation completed |
| // and starts a new one. |
| QUIC_FLAG(double, FLAGS_quic_ack_aggregation_bandwidth_threshold, 1.0) |
| |
| // If set to non-zero, the maximum number of consecutive pings that can be sent |
| // with aggressive initial retransmittable on wire timeout if there is no new |
| // data received. After which, the timeout will be exponentially back off until |
| // exceeds the default ping timeout. |
| QUIC_FLAG(int32_t, |
| FLAGS_quic_max_aggressive_retransmittable_on_wire_ping_count, |
| 0) |
| |
| // The maximum congestion window in packets. |
| QUIC_FLAG(int32_t, FLAGS_quic_max_congestion_window, 2000) |
| |
| // The default minimum duration for BBRv2-native probes, in milliseconds. |
| QUIC_FLAG(int32_t, FLAGS_quic_bbr2_default_probe_bw_base_duration_ms, 2000) |
| |
| // The default upper bound of the random amount of BBRv2-native |
| // probes, in milliseconds. |
| QUIC_FLAG(int32_t, FLAGS_quic_bbr2_default_probe_bw_max_rand_duration_ms, 1000) |
| |
| // The default period for entering PROBE_RTT, in milliseconds. |
| QUIC_FLAG(int32_t, FLAGS_quic_bbr2_default_probe_rtt_period_ms, 10000) |
| |
| // The default loss threshold for QUIC BBRv2, should be a value |
| // between 0 and 1. |
| QUIC_FLAG(double, FLAGS_quic_bbr2_default_loss_threshold, 0.02) |
| |
| // The default minimum number of loss marking events to exit STARTUP. |
| QUIC_FLAG(int32_t, FLAGS_quic_bbr2_default_startup_full_loss_count, 8) |
| |
| // The default fraction of unutilized headroom to try to leave in path |
| // upon high loss. |
| QUIC_FLAG(double, FLAGS_quic_bbr2_default_inflight_hi_headroom, 0.01) |
| |
| // If true, disable QUIC version Q043. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_disable_version_q043, false) |
| |
| // If true, disable QUIC version Q046. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_disable_version_q046, false) |
| |
| // If true, disable QUIC version Q050. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_disable_version_q050, false) |
| |
| // A testonly reloadable flag that will always default to false. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_testonly_default_false, false) |
| |
| // A testonly reloadable flag that will always default to true. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_testonly_default_true, true) |
| |
| // A testonly restart flag that will always default to false. |
| QUIC_FLAG(bool, FLAGS_quic_restart_flag_quic_testonly_default_false, false) |
| |
| // A testonly restart flag that will always default to true. |
| QUIC_FLAG(bool, FLAGS_quic_restart_flag_quic_testonly_default_true, true) |
| |
| // The default initial value of the max ack height filter's window length. |
| QUIC_FLAG(int32_t, FLAGS_quic_bbr2_default_initial_ack_height_filter_window, 10) |
| |
| // The default minimum number of loss marking events to exit PROBE_UP phase. |
| QUIC_FLAG(double, FLAGS_quic_bbr2_default_probe_bw_full_loss_count, 2) |
| |
| // When true, ensure the ACK delay is never less than the alarm granularity when |
| // ACK decimation is enabled. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_ack_delay_alarm_granularity, |
| false) |
| |
| // If true, use predictable grease settings identifiers and values. |
| QUIC_FLAG(bool, FLAGS_quic_enable_http3_grease_randomness, true) |
| |
| // If true, disable QUIC version h3-25. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_disable_version_draft_25, true) |
| |
| // If true, disable QUIC version h3-27. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_disable_version_draft_27, false) |
| |
| // If true, server push will be allowed in QUIC versions using HTTP/3. |
| QUIC_FLAG(bool, FLAGS_quic_enable_http3_server_push, false) |
| |
| // The divisor that controls how often MAX_STREAMS frames are sent. |
| QUIC_FLAG(int32_t, FLAGS_quic_max_streams_window_divisor, 2) |
| |
| // If true, QUIC BBRv2\'s PROBE_BW mode will not reduce cwnd below |
| // BDP+ack_height. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_bbr2_avoid_too_low_probe_bw_cwnd, |
| false) |
| |
| // When true, the 1RTT and 2RTT connection options decrease the number of round |
| // trips in BBRv2 STARTUP without a 25% bandwidth increase to 1 or 2 round trips |
| // respectively. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_bbr2_fewer_startup_round_trips, |
| false) |
| |
| // If true, enables support for TLS resumption in QUIC. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_tls_resumption_v2, false) |
| |
| // When true, QUIC's BBRv2 ignores inflight_lo in PROBE_BW. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr2_ignore_inflight_lo, false) |
| |
| // If true, support for IETF QUIC 0-rtt is enabled. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_zero_rtt_for_tls, true) |
| |
| // If true, default on PTO which unifies TLP + RTO loss recovery. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_default_on_pto, false) |
| |
| // When true, QUIC+TLS will not send nor parse the old-format Google-specific |
| // transport parameters. |
| QUIC_FLAG(bool, |
| FLAGS_quic_restart_flag_quic_google_transport_param_omit_old, |
| true) |
| |
| // If true, QUIC will free writer-allocated packet buffer if writer->WritePacket |
| // is not called. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_avoid_leak_writer_buffer, true) |
| |
| // If true, the B2HI connection option limits reduction of inflight_hi to |
| // (1-Beta)*CWND. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr2_limit_inflight_hi, false) |
| |
| // If true, SendAllPendingAcks always send the earliest ACK. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_always_send_earliest_ack, true) |
| |
| // If true, disable QUIC version h3-T050. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_disable_version_t050, false) |
| |
| // If true, default-enable 5RTO blachole detection. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_default_enable_5rto_blackhole_detection2, |
| true) |
| |
| // If true, session does not send duplicate MAX_STREAMS. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_stop_sending_duplicate_max_streams, |
| true) |
| |
| // If true, enable QUIC version h3-29. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_draft_29, true) |
| |
| // If true, support HANDSHAKE_DONE frame in T050 |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_support_handshake_done_in_t050, |
| true) |
| |
| // If true, save user agent into in QuicSession. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_save_user_agent_in_quic_session, |
| true) |
| |
| // When true, QUIC_CRYPTO versions of QUIC will not send the max ACK delay |
| // unless it is configured to a non-default value. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_dont_send_max_ack_delay_if_default, |
| true) |
| |
| // If true, remove the head of line blocking caused by an unprocessable packet |
| // in the undecryptable packets list. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_fix_undecryptable_packets, true) |
| |
| // If true, do not use QuicUtil::IsBidirectionalStreamId() to determine gQUIC |
| // stream type. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_fix_gquic_stream_type, true) |
| |
| // When true, do not pad the QUIC_CRYPTO CHLO message itself. Note that the |
| // packet containing the CHLO will still be padded. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_dont_pad_chlo, false) |
| |
| // When true, QuicDispatcher supports decapsulation of Legacy Version |
| // Encapsulation packets. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_dispatcher_legacy_version_encapsulation, |
| false) |
| |
| // If true, update packet size when the first frame gets queued. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_update_packet_size, false) |
| |
| // If true, consider frame expansion when calculating extra padding bytes to |
| // meet minimum plaintext packet size required for header protection. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_fix_extra_padding_bytes, false) |
| |
| // If true, do not try to close stream again if stream fails to be closed upon |
| // connection close. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_do_not_close_stream_again_on_connection_close, |
| false) |
| |
| // If true, determine a serialized packet's fate before the packet gets |
| // serialized. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_determine_serialized_packet_fate_early, |
| false) |
| |
| // If true, take the largest acked packet into account when computing the sent |
| // packet number length. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_fix_packet_number_length, false) |
| |
| // If true, retransmit unacked handshake data before PTO expiry. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_retransmit_handshake_data_early, |
| false) |
| |
| // If true, improve Bbr2Sender::AdjustNetworkParameters by 1) do not inject a |
| // bandwidth sample to the bandwidth filter, and 2) re-calculate pacing rate |
| // after cwnd updated.. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_bbr2_improve_adjust_network_parameters, |
| false) |
| |
| // If true, try to coalesce packet of higher space with retransmissions to |
| // mitigate RTT inflations. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_coalesced_packet_of_higher_space, |
| false) |
| |
| // If true, record the received min_ack_delay in transport parameters to QUIC |
| // config. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_record_received_min_ack_delay, |
| false) |
