| // 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. |
| |
| // This file contains the list of QUIC protocol flags. |
| |
| // If true, QUIC BBR congestion control may be enabled via Finch and/or via QUIC |
| // connection options. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_allow_new_bbr, true) |
| |
| // 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, multipath is enabled for the connection. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_multipath, false) |
| |
| // 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 public reset packets will have the \"pre-v33\" public header |
| // flags. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_use_old_public_reset_packets, |
| true) |
| |
| // 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, QUIC respect HTTP2 SETTINGS frame rather than always close the |
| // connection. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_respect_http2_settings_frame, |
| true) |
| |
| // If true, re-enables QUIC_VERSION_36. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_36_v3, true) |
| |
| // If true, only open limited number of quic sessions per epoll event. Leave the |
| // rest to next event. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_limit_num_new_sessions_per_epoll_loop, |
| true) |
| |
| // If true, QUIC server push will enabled by default. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_enable_server_push_by_default, |
| true) |
| |
| // Allow large send deltas to be used as RTT samples. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_allow_large_send_deltas, true) |
| |
| // If true, release QuicCryptoStream\'s read buffer when stream are less |
| // frequently used. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_release_crypto_stream_buffer, |
| true) |
| |
| // Use a more conservative backoff of 2x instead of 1.5x for handshake |
| // retransmissions, as well as a larger minimum. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_conservative_handshake_retransmits, |
| false) |
| |
| // If true, buffer packets while parsing public headers instead of parsing down |
| // if CHLO is already buffered. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_buffer_packets_after_chlo, |
| false) |
| |
| // If true, enable the Lazy FACK style loss detection in QUIC. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_lazy_fack, true) |
| |
| // If true, do not override a connection in global map if exists. Only create |
| // QUIC session if it is successfully inserted to the global map. Toss the |
| // packet if insertion fails. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_create_session_after_insertion, |
| false) |
| |
| // If true, rejected packet number is removed from public reset packet. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_remove_packet_number_from_public_reset, |
| false) |
| |
| // If true, v33 QUIC client uses 1 bit to specify 8-byte connection id in |
| // public flag. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_remove_v33_hacks2, false) |
| |
| // If true, limits QUIC uncompressed headers to 16K. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_limit_uncompressed_headers, |
| true) |
| |
| // If true, release headers stream\'s sequencer buffer when there is no active |
| // stream. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_headers_stream_release_sequencer_buffer, |
| true) |
| |
| // Enable QUIC force HOL blocking experiment. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_force_hol_blocking, 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) |
| |
| // Add a new client connection options field to QuicOptions which is only used |
| // to configure client side features, such as congestion control. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_client_connection_options, true) |
| |
| // If true, fix some casts that were causing off-by-one errors in QUIC's cubic |
| // "convex" increases. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_fix_cubic_convex_mode, false) |
| |
| // If true, GFE sends SETTINGS_MAX_HEADER_LIST_SIZE to the client at the |
| // beginning of a connection. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_send_max_header_list_size, true) |
| |
| // If true, fix quantization of CubicBytes while performing convex increases. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_fix_cubic_bytes_quantization, |
| false) |
| |
| // If true, QUIC cubic code will use the event time when adjusting CWND after an |
| // ACK instead of the clock\'s current approximate time. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_use_event_time, true) |
| |
| // If true, lazy allocate and early release memeory used in |
| // QuicStreamSequencerBuffer to buffer incoming data. |
| QUIC_FLAG( |
| bool, |
| FLAGS_quic_reloadable_flag_quic_reduce_sequencer_buffer_memory_life_time, |
| true) |
| |
| // If true, Makes GFE respect the connection options for initial flow control |
| // window larger than 32 KB. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_large_ifw_options, true) |
| |
| // If true, fix Cubic\'s use of kBetaLastMax for n-connection emulation. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_fix_beta_last_max, false) |
| |
| // If true, enable QUIC v37. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_37, true) |
| |
| // If true, disables QUIC v34. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_disable_version_34, true) |
| |
| // Allow quic to properly support proxying 100 Continue responses. |
| QUIC_FLAG(bool, FLAGS_quic_restart_flag_quic_supports_100_continue, false) |
| |
| // If true, enable quic version 38 |
| QUIC_FLAG(bool, FLAGS_quic_enable_version_38, false) |
| |
| // When true, ensures the session's flow control window is always at least 1.5x |
| // larger than the largest stream flow control window. |
| QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_flow_control_invariant, false) |
| |
| // 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, bidi streaming is always enabled in QUIC. |
| QUIC_FLAG(bool, |
| FLAGS_quic_reloadable_flag_quic_always_enable_bidi_streaming, |
| false) |
