1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
|
// Copyright (c) 2020 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.
// NOLINT(build/header_guard)
// This file intentionally does not have header guards, it's intended to be
// included multiple times, each time with a different definition of
// QUIC_PROTOCOL_FLAG.
#if defined(QUIC_PROTOCOL_FLAG)
QUIC_PROTOCOL_FLAG(
bool,
quic_allow_chlo_buffering,
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_PROTOCOL_FLAG(bool,
quic_disable_pacing_for_perf_tests,
false,
"If true, disable pacing in QUIC")
QUIC_PROTOCOL_FLAG(bool,
quic_enforce_single_packet_chlo,
true,
"If true, enforce that QUIC CHLOs fit in one packet")
// Currently, this number is quite conservative. At a hypothetical 1000 qps,
// 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.
QUIC_PROTOCOL_FLAG(int64_t,
quic_time_wait_list_max_connections,
600000,
"Maximum number of connections on the time-wait list. "
"A negative value implies no configured limit.")
QUIC_PROTOCOL_FLAG(int64_t,
quic_time_wait_list_seconds,
200,
"Time period for which a given connection_id should live in "
"the time-wait state.")
QUIC_PROTOCOL_FLAG(double,
quic_bbr_cwnd_gain,
2.0f,
"Congestion window gain for QUIC BBR during PROBE_BW phase.")
QUIC_PROTOCOL_FLAG(
int32_t,
quic_buffered_data_threshold,
8 * 1024,
"If buffered data in QUIC stream is less than this "
"threshold, buffers all provided data or asks upper layer for more data")
QUIC_PROTOCOL_FLAG(
uint64_t,
quic_send_buffer_max_data_slice_size,
4 * 1024,
"Max size of data slice in bytes for QUIC stream send buffer.")
QUIC_PROTOCOL_FLAG(
int32_t,
quic_lumpy_pacing_size,
2,
"Number of packets that the pacing sender allows in bursts during "
"pacing. This flag is ignored if a flow's estimated bandwidth is "
"lower than 1200 kbps.")
QUIC_PROTOCOL_FLAG(
double,
quic_lumpy_pacing_cwnd_fraction,
0.25f,
"Congestion window fraction that the pacing sender allows in bursts "
"during pacing.")
QUIC_PROTOCOL_FLAG(int32_t,
quic_max_pace_time_into_future_ms,
10,
"Max time that QUIC can pace packets into the future in ms.")
QUIC_PROTOCOL_FLAG(
double,
quic_pace_time_into_future_srtt_fraction,
0.125f, // One-eighth smoothed RTT
"Smoothed RTT fraction that a connection can pace packets into the future.")
QUIC_PROTOCOL_FLAG(bool,
quic_export_write_path_stats_at_server,
false,
"If true, export detailed write path statistics at server.")
QUIC_PROTOCOL_FLAG(bool,
quic_disable_version_negotiation_grease_randomness,
false,
"If true, use predictable version negotiation versions.")
QUIC_PROTOCOL_FLAG(bool,
quic_enable_http3_grease_randomness,
true,
"If true, use random greased settings and frames.")
QUIC_PROTOCOL_FLAG(int64_t,
quic_max_tracked_packet_count,
10000,
"Maximum number of tracked packets.")
QUIC_PROTOCOL_FLAG(
bool,
quic_client_convert_http_header_name_to_lowercase,
true,
"If true, HTTP request header names sent from QuicSpdyClientBase(and "
"descendents) will be automatically converted to lower case.")
QUIC_PROTOCOL_FLAG(
int32_t,
quic_bbr2_default_probe_bw_base_duration_ms,
2000,
"The default minimum duration for BBRv2-native probes, in milliseconds.")
QUIC_PROTOCOL_FLAG(
int32_t,
quic_bbr2_default_probe_bw_max_rand_duration_ms,
1000,
"The default upper bound of the random amount of BBRv2-native "
"probes, in milliseconds.")
QUIC_PROTOCOL_FLAG(
int32_t,
quic_bbr2_default_probe_rtt_period_ms,
10000,
"The default period for entering PROBE_RTT, in milliseconds.")
QUIC_PROTOCOL_FLAG(
double,
quic_bbr2_default_loss_threshold,
0.02,
"The default loss threshold for QUIC BBRv2, should be a value "
"between 0 and 1.")
QUIC_PROTOCOL_FLAG(
int32_t,
quic_bbr2_default_startup_full_loss_count,
8,
"The default minimum number of loss marking events to exit STARTUP.")
QUIC_PROTOCOL_FLAG(
int32_t,
quic_bbr2_default_probe_bw_full_loss_count,
2,
"The default minimum number of loss marking events to exit PROBE_UP phase.")
QUIC_PROTOCOL_FLAG(
double,
quic_bbr2_default_inflight_hi_headroom,
0.15,
"The default fraction of unutilized headroom to try to leave in path "
"upon high loss.")
QUIC_PROTOCOL_FLAG(
int32_t,
quic_bbr2_default_initial_ack_height_filter_window,
10,
"The default initial value of the max ack height filter's window length.")
QUIC_PROTOCOL_FLAG(
double,
quic_ack_aggregation_bandwidth_threshold,
1.0,
"If the bandwidth during ack aggregation is smaller than (estimated "
"bandwidth * this flag), consider the current aggregation completed "
"and starts a new one.")
// TODO(b/153892665): Change the default value of
// quic_anti_amplification_factor back to 3 when cert compression is
// supported.
QUIC_PROTOCOL_FLAG(
int32_t,
quic_anti_amplification_factor,
5,
3,
"Anti-amplification factor. Before address validation, server will "
"send no more than factor times bytes received.")
QUIC_PROTOCOL_FLAG(
int32_t,
quic_max_buffered_crypto_bytes,
16 * 1024, // 16 KB
"The maximum amount of CRYPTO frame data that can be buffered.")
QUIC_PROTOCOL_FLAG(
int32_t,
quic_max_aggressive_retransmittable_on_wire_ping_count,
5,
"Maximum number of consecutive pings that can be sent with the "
"aggressive initial retransmittable on the wire timeout if there is "
"no new stream data received. After this limit, the timeout will be "
"doubled each ping until it exceeds the default ping timeout.")
QUIC_PROTOCOL_FLAG(
int32_t,
quic_max_retransmittable_on_wire_ping_count,
1000,
"Maximum number of pings that can be sent with the retransmittable "
"on the wire timeout, over the lifetime of a connection. After this "
"limit, the timeout will be the default ping timeout.")
QUIC_PROTOCOL_FLAG(int32_t,
quic_max_congestion_window,
2000,
"The maximum congestion window in packets.")
QUIC_PROTOCOL_FLAG(
int32_t,
quic_max_streams_window_divisor,
2,
"The divisor that controls how often MAX_STREAMS frame is sent.")
QUIC_PROTOCOL_FLAG(
uint64_t,
quic_key_update_confidentiality_limit,
0,
"If non-zero and key update is allowed, the maximum number of "
"packets sent for each key phase before initiating a key update.")
QUIC_PROTOCOL_FLAG(bool,
quic_disable_client_tls_zero_rtt,
false,
"If true, QUIC client with TLS will not try 0-RTT.")
QUIC_PROTOCOL_FLAG(bool,
quic_disable_server_tls_resumption,
false,
"If true, QUIC server will disable TLS resumption by not "
"issuing or processing session tickets.")
QUIC_PROTOCOL_FLAG(bool,
quic_defer_send_in_response,
true,
"If true, QUIC servers will defer sending in response to "
"incoming packets by default.")
QUIC_PROTOCOL_FLAG(
bool,
quic_header_size_limit_includes_overhead,
true,
"If true, QUIC QPACK decoder includes 32-bytes overheader per entry while "
"comparing request/response header size against its upper limit.")
QUIC_PROTOCOL_FLAG(
bool,
quic_reject_retry_token_in_initial_packet,
false,
"If true, always reject retry_token received in INITIAL packets")
#endif
|
