| // 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) |
| |
| // Allows the 3RTO QUIC connection option to close a QUIC connection after |
| // 3RTOs if there are no open streams. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_3rtos, 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) |
| |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_disable_version_41_2, 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, 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) |
| |
| // If true, QuicConnection::ProcessPacket will add the connection to write |
| // blocked list if it is write blocked, and will not attempt to write before the |
| // writer unblocks. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_add_to_blocked_list_if_writer_blocked, |
| true) |
| |
| // Only send an ack immediately when a previously missing packet is received if |
| // an ack with a larger largest acked has already been sent. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_ack_reordered_packets, true) |
| |
| // If true, QuicWriteBlockedList will use StaticStreamCollection to speed up |
| // operations on static streams. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_use_static_stream_collection_in_write_blocked_list, |
| true) |
| |
| // If true, disables QUIC v42. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_disable_version_42, 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, true) |
| |
| // If true, mark QUIC as app-limited after sending queued packets or |
| // retransmisssions and we then become congestion control blocked. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_retransmissions_app_limited, |
| true) |
| |
| // 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) |
| |
| // If true, fix potential crashes in QuicSession::RetransmitLostData. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_fix_retransmit_lost_data, true) |
| |
| // 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) |
