| // 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 |
| |
| // 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) |
| |
| // Enables server-side support for QUIC stateless rejects. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_enable_quic_stateless_reject_support, |
| true) |
| |
| // 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, QUIC will use cheap stateless rejects without creating a full |
| // connection. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_use_cheap_stateless_rejects, |
| 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) |
| |
| // Simplify QUIC\'s adaptive time loss detection to measure the necessary |
| // reordering window for every spurious retransmit. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_fix_adaptive_time_loss, false) |
| |
| // When true, defaults to BBR congestion control instead of Cubic. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_default_to_bbr, 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) |
| |
| // If true, QUIC supports both QUIC Crypto and TLS 1.3 for the handshake |
| // protocol. |
| QUIC_FLAG(bool, FLAGS_quic_supports_tls_handshake, false) |
| |
| // Allow QUIC to accept initial packet numbers that are random, not 1. |
| QUIC_FLAG(bool, FLAGS_quic_restart_flag_quic_enable_accept_random_ipn, false) |
| |
| // If true, enable QUIC v43. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_43, true) |
| |
| // 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, limit quic stream length to be below 2^62. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_stream_too_long, true) |
| |
| // If true, enable QUIC v99. |
| QUIC_FLAG(bool, FLAGS_quic_enable_version_99, false) |
| |
| // 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, 1) |
| |
| // 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) |
| |
| // If true, enable QUIC v44. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_44, true) |
| |
| // Stop checking QuicUnackedPacketMap::HasUnackedRetransmittableFrames and |
| // instead rely on the existing check that bytes_in_flight > 0 |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_optimize_inflight_check, false) |
| |
| // When you\'re app-limited entering recovery, stay app-limited until you exit |
| // recovery in QUIC BBR. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_app_limited_recovery, false) |
| |
| // 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) |
| |
| // Add 3 connection options to decrease the pacing and CWND gain in QUIC BBR |
| // STARTUP. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_slower_startup3, false) |
| |
| // When true, the LOSS connection option allows for 1/8 RTT of reording instead |
| // of the current 1/8th threshold which has been found to be too large for fast |
| // loss recovery. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_eighth_rtt_loss_detection, |
| 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) |
| |
| // If true, QuicCryptoServerConfig::EvaluateClientHello will use GetCertChain |
| // instead of the more expensive GetProof. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_use_get_cert_chain, false) |
| |
| // If true, try to aggregate acked stream frames. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_aggregate_acked_stream_frames_2, |
| false) |
| |
| // If true, only process stateless reset packets on the client side. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_process_stateless_reset_at_client_only, |
| false) |
| |
| // If true, do not retransmit old window update frames. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_donot_retransmit_old_window_update2, |
| false) |
| |
| // If ture, make QuicSession::GetStream faster by skipping the lookup into |
| // static stream map, when possible. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_session_faster_get_stream, |
| false) |
| |
| // If true, when session decides what to write, set a approximate retransmission |
| // for packets to be retransmitted. Also check packet state in |
| // IsPacketUsefulForRetransmittableData. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_fix_is_useful_for_retrans, true) |
| |
| // If true, disable QUIC version 35. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_disable_version_35, false) |
| // If true, then QuicCryptoServerConfig::ProcessClientHelloAfterGetProof() will |
| // use the async interface to KeyExchange::CalculateSharedKeys. |
| QUIC_FLAG(bool, FLAGS_quic_restart_flag_quic_use_async_key_exchange, false) |
| |
| // If true, increase size of random bytes in IETF stateless reset packet. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_more_random_bytes_in_stateless_reset, |
| false) |
| |
| // If true, use new, lower-overhead implementation of LRU cache for compressed |
| // certificates. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_new_lru_cache, 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) |
| |
| // If true, mark packets for loss retransmission even they do not contain |
| // retransmittable frames. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_fix_mark_for_loss_retransmission, |
| false) |
| |
| // If true, enable version 45. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_45, false) |
| |
| // If true, QuicSession::HasPendingCryptoData checks whether the crypto stream's |
| // send buffer is empty. This flag fixes a bug where the retransmission alarm |
| // mode is wrong for the first CHLO packet. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_fix_has_pending_crypto_data, |
| true) |
| |
| // This flag fixes a bug where a zombie stream cannot be correctly reset. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_fix_reset_zombie_streams, true) |
| |
| // When true, fix initialization and updating of |
| // |time_of_first_packet_sent_after_receiving_| in QuicConnection. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_fix_time_of_first_packet_sent_after_receiving, |
| true) |
| |
| // If true, deprecate PostProcessAfterData from QuicConnection. This is used to |
| // fix a bug where window update causes session to write data. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_deprecate_post_process_after_data, |
| true) |
| |
| // 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 true, don't arm the path degrading alarm on the server side and stop |
| // using HasUnackedPackets to decide when to arm it. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_fix_path_degrading_alarm, true) |
| |
| // When true, QUIC server push uses a unidirectional stream. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_unidirectional_server_push_stream, |
| false) |
| |
| // If true, a QUIC connection will attempt to process decryptable packets when |
| // a new decryption key is made available. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_decrypt_packets_on_key_change, |
| false) |
| |
| // This flag fixes a bug where dispatcher's last_packet_is_ietf_quic may be |
| // wrong when getting proof asynchronously. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_fix_last_packet_is_ietf_quic, |
| true) |
| |
| // If true, dispatcher passes in a single version when creating a server |
| // connection, such that version negotiation is not supported in connection. |
| QUIC_FLAG(bool, |
| FLAGS_quic_restart_flag_quic_no_server_conn_ver_negotiation, |
| false) |
| |
| // If true, enable QUIC version 46 which adds CRYPTO frames. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_46, false) |
| |
| // When true, cache that encryption has been established to save CPU. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_optimize_encryption_established, |
| 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, make GeneralLossAlgorithm::DetectLosses faster by never rescanning |
| // the same packet in QuicUnackedPacketMap. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_faster_detect_loss, 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) |
