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222 lines
9.2 KiB
C
222 lines
9.2 KiB
C
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// This file intentionally does not have header guards, it's included
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// inside a macro to generate values. The following line silences a
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// presubmit warning that would otherwise be triggered by this:
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// no-include-guard-because-multiply-included
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// This file contains the list of QUIC protocol flags.
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// Time period for which a given connection_id should live in the time-wait
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// state.
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QUIC_FLAG(int64_t, FLAGS_quic_time_wait_list_seconds, 200)
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// Currently, this number is quite conservative. The max QPS limit for an
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// individual server silo is currently set to 1000 qps, though the actual max
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// that we see in the wild is closer to 450 qps. Regardless, this means that
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// the longest time-wait list we should see is 200 seconds * 1000 qps, 200000.
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// Of course, there are usually many queries per QUIC connection, so we allow a
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// factor of 3 leeway.
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//
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// Maximum number of connections on the time-wait list. A negative value implies
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// no configured limit.
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QUIC_FLAG(int64_t, FLAGS_quic_time_wait_list_max_connections, 600000)
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// Enables server-side support for QUIC stateless rejects.
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QUIC_FLAG(bool,
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FLAGS_quic_reloadable_flag_enable_quic_stateless_reject_support,
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true)
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// If true, require handshake confirmation for QUIC connections, functionally
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// disabling 0-rtt handshakes.
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// TODO(rtenneti): Enable this flag after CryptoServerTest's are fixed.
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QUIC_FLAG(bool,
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FLAGS_quic_reloadable_flag_quic_require_handshake_confirmation,
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false)
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// If true, disable pacing in QUIC.
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QUIC_FLAG(bool, FLAGS_quic_disable_pacing_for_perf_tests, false)
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// If true, QUIC will use cheap stateless rejects without creating a full
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// connection.
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QUIC_FLAG(bool,
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FLAGS_quic_reloadable_flag_quic_use_cheap_stateless_rejects,
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true)
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// If true, allows packets to be buffered in anticipation of a future CHLO, and
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// allow CHLO packets to be buffered until next iteration of the event loop.
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QUIC_FLAG(bool, FLAGS_quic_allow_chlo_buffering, true)
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// If greater than zero, mean RTT variation is multiplied by the specified
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// factor and added to the congestion window limit.
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QUIC_FLAG(double, FLAGS_quic_bbr_rtt_variation_weight, 0.0f)
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// Congestion window gain for QUIC BBR during PROBE_BW phase.
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QUIC_FLAG(double, FLAGS_quic_bbr_cwnd_gain, 2.0f)
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// Simplify QUIC\'s adaptive time loss detection to measure the necessary
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// reordering window for every spurious retransmit.
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QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_fix_adaptive_time_loss, false)
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// Allows the 3RTO QUIC connection option to close a QUIC connection after
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// 3RTOs if there are no open streams.
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QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_3rtos, false)
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// When true, defaults to BBR congestion control instead of Cubic.
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QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_default_to_bbr, false)
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// If buffered data in QUIC stream is less than this threshold, buffers all
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// provided data or asks upper layer for more data.
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QUIC_FLAG(uint32_t, FLAGS_quic_buffered_data_threshold, 8192u)
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// Max size of data slice in bytes for QUIC stream send buffer.
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QUIC_FLAG(uint32_t, FLAGS_quic_send_buffer_max_data_slice_size, 4096u)
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// If true, QUIC supports both QUIC Crypto and TLS 1.3 for the handshake
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// protocol.
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QUIC_FLAG(bool, FLAGS_quic_supports_tls_handshake, false)
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// Allow QUIC to accept initial packet numbers that are random, not 1.
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QUIC_FLAG(bool, FLAGS_quic_restart_flag_quic_enable_accept_random_ipn, false)
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// If true, enable QUIC v43.
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QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_43, true)
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// Enables 3 new connection options to make PROBE_RTT more aggressive
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QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_less_probe_rtt, false)
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// If true, limit quic stream length to be below 2^62.
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QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_stream_too_long, true)
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// If true, enable QUIC v99.
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QUIC_FLAG(bool, FLAGS_quic_enable_version_99, false)
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// When true, set the initial congestion control window from connection options
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// in QuicSentPacketManager rather than TcpCubicSenderBytes.
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QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_unified_iw_options, false)
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// Number of packets that the pacing sender allows in bursts during pacing.
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QUIC_FLAG(int32_t, FLAGS_quic_lumpy_pacing_size, 1)
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// Congestion window fraction that the pacing sender allows in bursts during
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// pacing.
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QUIC_FLAG(double, FLAGS_quic_lumpy_pacing_cwnd_fraction, 0.25f)
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// Default enables QUIC ack decimation and adds a connection option to disable
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// it.
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QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_ack_decimation, false)
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// If true, QUIC offload pacing when using USPS as egress method.
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QUIC_FLAG(bool, FLAGS_quic_restart_flag_quic_offload_pacing_to_usps2, false)
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// Max time that QUIC can pace packets into the future in ms.
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QUIC_FLAG(int32_t, FLAGS_quic_max_pace_time_into_future_ms, 10)
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// Smoothed RTT fraction that a connection can pace packets into the future.
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QUIC_FLAG(double, FLAGS_quic_pace_time_into_future_srtt_fraction, 0.125f)
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// If true, enable QUIC v44.
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QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_44, true)
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// Only send an ack immediately when a previously missing packet is received if
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// an ack with a larger largest acked has already been sent.
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QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_ack_reordered_packets, true)
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// Stop checking QuicUnackedPacketMap::HasUnackedRetransmittableFrames and
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// instead rely on the existing check that bytes_in_flight > 0
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QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_optimize_inflight_check, false)
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// When you\'re app-limited entering recovery, stay app-limited until you exit
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// recovery in QUIC BBR.
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QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_app_limited_recovery, false)
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// If true, mark QUIC as app-limited after sending queued packets or
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// retransmisssions and we then become congestion control blocked.
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QUIC_FLAG(bool,
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FLAGS_quic_reloadable_flag_quic_retransmissions_app_limited,
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true)
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// If true, stop resetting ideal_next_packet_send_time_ in pacing sender.
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QUIC_FLAG(
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bool,
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FLAGS_quic_reloadable_flag_quic_donot_reset_ideal_next_packet_send_time,
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false)
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// If true, enable experiment for testing PCC congestion-control.
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QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_pcc3, false)
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// If true, fix potential crashes in QuicSession::RetransmitLostData.
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QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_fix_retransmit_lost_data, true)
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// When true, ensure BBR allows at least one MSS to be sent in response to an
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// ACK in packet conservation.
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QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_one_mss_conservation, false)
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// Add 3 connection options to decrease the pacing and CWND gain in QUIC BBR
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// STARTUP.
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QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_slower_startup3, false)
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// When true, the LOSS connection option allows for 1/8 RTT of reording instead
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// of the current 1/8th threshold which has been found to be too large for fast
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// loss recovery.
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QUIC_FLAG(bool,
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FLAGS_quic_reloadable_flag_quic_eighth_rtt_loss_detection,
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false)
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// Enables the BBQ5 connection option, which forces saved aggregation values to
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// expire when the bandwidth increases more than 25% in QUIC BBR STARTUP.
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QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_slower_startup4, false)
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// If true, QuicCryptoServerConfig::EvaluateClientHello will use GetCertChain
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// instead of the more expensive GetProof.
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QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_use_get_cert_chain, false)
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// If true, try to aggregate acked stream frames.
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QUIC_FLAG(bool,
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FLAGS_quic_reloadable_flag_quic_aggregate_acked_stream_frames,
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false)
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// If true, only process stateless reset packets on the client side.
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QUIC_FLAG(
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bool,
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FLAGS_quic_reloadable_flag_quic_process_stateless_reset_at_client_only,
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false)
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// If true, do not retransmit old window update frames.
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QUIC_FLAG(bool,
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FLAGS_quic_reloadable_flag_quic_donot_retransmit_old_window_update2,
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false)
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// If ture, make QuicSession::GetStream faster by skipping the lookup into
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// static stream map, when possible.
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QUIC_FLAG(bool,
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FLAGS_quic_reloadable_flag_quic_session_faster_get_stream,
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false)
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// If true, when session decides what to write, set a approximate retransmission
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// for packets to be retransmitted. Also check packet state in
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// IsPacketUsefulForRetransmittableData.
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QUIC_FLAG(bool,
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FLAGS_quic_reloadable_flag_quic_fix_is_useful_for_retrans,
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false)
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// If true, QUIC connection will notify the debug visitor after a connectivity
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// probing is sent.
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QUIC_FLAG(
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bool,
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FLAGS_quic_reloadable_flag_quic_notify_debug_visitor_on_connectivity_probing_sent,
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false)
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// If true, disable QUIC version 35.
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QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_disable_version_35, false)
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// If true, then QuicCryptoServerConfig::ProcessClientHelloAfterGetProof() will
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// use the async interface to KeyExchange::CalculateSharedKeys.
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QUIC_FLAG(bool, FLAGS_quic_restart_flag_quic_use_async_key_exchange, false)
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// If true, increase size of random bytes in IETF stateless reset packet.
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QUIC_FLAG(bool,
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FLAGS_quic_reloadable_flag_quic_more_random_bytes_in_stateless_reset,
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false)
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