| // 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) |
| |
| // If true, adjust congestion window when doing bandwidth resumption in BBR. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_fix_bbr_cwnd_in_bandwidth_resumption, |
| true) |
| |
| // 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) |
| |
| // Enables 3 new connection options to make PROBE_RTT more aggressive |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_less_probe_rtt, false) |
| |
| // If true, enable QUIC v99. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_99, true) |
| |
| // 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, false) |
| |
| // 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) |
| |
| // If true, enable experiment for testing PCC congestion-control. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_pcc3, false) |
| |
| // When true, ensure BBR allows at least one MSS to be sent in response to an |
| // ACK in packet conservation. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_one_mss_conservation, false) |
| |
| // Enables the BBQ5 connection option, which forces saved aggregation values to |
| // expire when the bandwidth increases more than 25% in QUIC BBR STARTUP. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_slower_startup4, 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) |
| |
| // If true, calling StopReading() on a level-triggered QUIC stream sequencer |
| // will cause the sequencer to discard future data. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_stop_reading_when_level_triggered, |
| 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, use common code for checking whether a new stream ID may be |
| // allocated. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_use_common_stream_check, false) |
| |
| // If true, QuicEpollClock::Now() will monotonically increase. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_monotonic_epoll_clock, false) |
| |
| // If true, enables the BBS4 and BBS5 connection options, which reduce BBR's |
| // pacing rate in STARTUP as more losses occur as a fraction of CWND. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_bbr_startup_rate_reduction, |
| 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, enable QUIC version 49. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_49, true) |
| |
| // 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) |
| |
| // When true, QUIC Version Negotiation packets will randomly include fake |
| // versions. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_version_negotiation_grease, |
| true) |
| |
| // If true, use predictable version negotiation versions. |
| QUIC_FLAG(bool, FLAGS_quic_disable_version_negotiation_grease_randomness, false) |
| |
| // If true, do not add connection ID of packets with unknown connection ID |
| // and no version to time wait list, instead, send appropriate responses |
| // depending on the packets' sizes and drop them. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_reject_unprocessable_packets_statelessly, |
| true) |
| |
| // 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, will negotiate the ACK delay time. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_negotiate_ack_delay_time, false) |
| |
| // If true, QuicFramer::WriteClientVersionNegotiationProbePacket uses |
| // length-prefixed connection IDs. |
| QUIC_FLAG(bool, FLAGS_quic_prober_uses_length_prefixed_connection_ids, false) |
| |
| // If true and H2PR connection option is received, write_blocked_streams_ uses |
| // HTTP2 (tree-style) priority write scheduler. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_use_http2_priority_write_scheduler, |
| true) |
| |
| // If true and FIFO connection option is received, write_blocked_streams uses |
| // FIFO(stream with smallest ID has highest priority) write scheduler. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_enable_fifo_write_scheduler, |
| true) |
| |
| // If true and LIFO connection option is received, write_blocked_streams uses |
| // LIFO(stream with largest ID has highest priority) write scheduler. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_enable_lifo_write_scheduler, |
| true) |
| |
| // If true, QuicStreamSequencer will not take in new data if the stream is |
| // reset. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_no_stream_data_after_reset, |
| false) |
| |
| // If true, enable IETF style probe timeout. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_pto, true) |
| |
| // The maximum amount of CRYPTO frame data that can be buffered. |
| QUIC_FLAG(int32_t, FLAGS_quic_max_buffered_crypto_bytes, 16 * 1024) |
| |
| // If true, QUIC supports both QUIC Crypto and TLS 1.3 for the handshake |
| // protocol. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_supports_tls_handshake, true) |
| |
| // If true, enable IETF loss detection as described in |
| // https://tools.ietf.org/html/draft-ietf-quic-recovery-22#section-6.1. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_enable_ietf_loss_detection, |
| true) |
| |
| // If true, skip packet number before sending the last PTO retransmission. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_skip_packet_number_for_pto, |
| true) |
| // If true, enable HTTP/2 default scheduling(round robin). |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_rr_write_scheduler, true) |
| |
| // If true, QuicFramer does not create an encrypter/decrypter for the |
| // ENCRYPTION_INITIAL level. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_framer_doesnt_create_initial_encrypter, |
| true) |
| |
| // If true, treat queued QUIC packets as sent. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_treat_queued_packets_as_sent, |
| true) |
| |
| // Call NeuterHandshakePackets() at most once per connection. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_neuter_handshake_packets_once2, |
| false) |
| |
| // If true, support HTTP/3 priority in v99. |
| QUIC_FLAG(bool, FLAGS_quic_allow_http3_priority, false) |
| |
| // If true, enable QUIC version 50. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_50, true) |
| |
| // If true, enable QUIC MTU discovery version 2. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_mtu_discovery_v2, true) |
| |
| // If true, QUIC connection close packet will be sent at all available |
| // encryption levels. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_close_all_encryptions_levels, |
| false) |
| |
| // 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) |
| |
| // If true, Adjacent stream frames will be combined into one stream frame before |
| // the packet is serialized. |
| QUIC_FLAG(bool, FLAGS_quic_restart_flag_quic_coalesce_stream_frames_2, false) |
| |
| // If true, populate nonretransmittable frames in SerializedPacket. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_populate_nonretransmittable_frames, |
| true) |
| |
| // If true, a stream will be reset if it receives fin that has offset less than |
| // its highest offset. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_no_decrease_in_final_offset, |
| false) |
| |
| // If true, connection will be closed if a stream receives stream frame or |
| // RESET_STREAM frame with bad close offset. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_close_connection_on_wrong_offset, |
| false) |
| |
| // If true, re-calculate pacing rate when cwnd gets bootstrapped. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_fix_pacing_rate, true) |
| |
| // The maximum congestion window in packets. |
| QUIC_FLAG(int32_t, FLAGS_quic_max_congestion_window, 2000) |
| |
| // If true, QuicCryptoStream::OnCryptoFrame() will never use the frame's |
| // encryption level. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_use_connection_encryption_level, |
| false) |
| |
| // If true, do not inject bandwidth in BbrSender::AdjustNetworkParameters. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_bbr_donot_inject_bandwidth, |
| false) |
| |
| // If true, close connection if CreateAndSerializeStreamFrame fails. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_close_connection_on_failed_consume_data_fast_path, |
| false) |
| |
| // If true, add a up call when N packet numbers get skipped. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_on_packet_numbers_skipped, |
| false) |
| |
| // 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, 0.3) |
| |
| // 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, for QUIC BBRv2: 1) don't grow inflight_hi unless it's fully used, |
| // and 2) cap inflight_lo in PROBE_CRUISE. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr2_fix_inflight_bounds, false) |
