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gnunet_constants.h (5317B)

      1 /*
      2      This file is part of GNUnet.
      3      Copyright (C) 2009 GNUnet e.V.
      4 
      5      GNUnet is free software: you can redistribute it and/or modify it
      6      under the terms of the GNU Affero General Public License as published
      7      by the Free Software Foundation, either version 3 of the License,
      8      or (at your option) any later version.
      9 
     10      GNUnet is distributed in the hope that it will be useful, but
     11      WITHOUT ANY WARRANTY; without even the implied warranty of
     12      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13      Affero General Public License for more details.
     14 
     15      You should have received a copy of the GNU Affero General Public License
     16      along with this program.  If not, see <http://www.gnu.org/licenses/>.
     17 
     18      SPDX-License-Identifier: AGPL3.0-or-later
     19  */
     20 
     21 /**
     22  * @author Christian Grothoff
     23  *
     24  * @file
     25  * Global constants for performance tuning
     26  *
     27  * @defgroup constants  Constant definitions
     28  * Global constants for performance tuning
     29  * @{
     30  */
     31 
     32 #ifndef GNUNET_CONSTANTS_H
     33 #define GNUNET_CONSTANTS_H
     34 
     35 #ifdef __cplusplus
     36 extern "C"
     37 {
     38 #if 0                           /* keep Emacsens' auto-indent happy */
     39 }
     40 #endif
     41 #endif
     42 
     43 
     44 /**
     45  * Bandwidth (in/out) to assume initially (before either peer has
     46  * communicated any particular preference).  Should be rather low; set
     47  * so that at least one maximum-size message can be send roughly once
     48  * per minute.
     49  */
     50 #define GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT GNUNET_BANDWIDTH_value_init (1024 \
     51                                                                         * 1024)
     52 
     53 /**
     54  * After how long do we consider a connection to a peer dead
     55  * if we don't receive messages from the peer?
     56  */
     57 #define GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT GNUNET_TIME_relative_multiply ( \
     58     GNUNET_TIME_UNIT_MINUTES, 5)
     59 
     60 /**
     61  * How long do we delay reading more from a peer after a quota violation?
     62  */
     63 #define GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT GNUNET_TIME_relative_multiply ( \
     64     GNUNET_TIME_UNIT_SECONDS, 2)
     65 
     66 /**
     67  * After how long do we consider a service unresponsive
     68  * even if we assume that the service commonly does not
     69  * respond instantly (DNS, Database, etc.).
     70  */
     71 #define GNUNET_CONSTANTS_SERVICE_TIMEOUT GNUNET_TIME_relative_multiply ( \
     72     GNUNET_TIME_UNIT_MINUTES, 10)
     73 
     74 /**
     75  * How long do we delay messages to get larger packet sizes (CORKing)?
     76  */
     77 #define GNUNET_CONSTANTS_MAX_CORK_DELAY GNUNET_TIME_relative_multiply ( \
     78     GNUNET_TIME_UNIT_SECONDS, 1)
     79 
     80 /**
     81  * After what amount of latency for a message do we print a warning?
     82  */
     83 #define GNUNET_CONSTANTS_LATENCY_WARN GNUNET_TIME_relative_multiply ( \
     84     GNUNET_TIME_UNIT_SECONDS, 3)
     85 
     86 /**
     87  * Until which load do we consider the peer overly idle
     88  * (which means that we would like to use more resources).<p>
     89  *
     90  * Note that we use 70 to leave some room for applications
     91  * to consume resources "idly" (i.e. up to 85%) and then
     92  * still have some room for "paid for" resource consumption.
     93  */
     94 #define GNUNET_CONSTANTS_IDLE_LOAD_THRESHOLD 70
     95 
     96 /**
     97  * For how long do we allow unused bandwidth
     98  * from the past to carry over into the future? (in seconds)
     99  */
    100 #define GNUNET_CONSTANTS_MAX_BANDWIDTH_CARRY_S 5
    101 
    102 
    103 /**
    104  * After how long do we expire an address in a HELLO that we just
    105  * validated?  This value is also used for our own addresses when we
    106  * create a HELLO.
    107  */
    108 #define GNUNET_CONSTANTS_HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply ( \
    109     GNUNET_TIME_UNIT_HOURS, 12)
    110 
    111 
    112 /**
    113  * How long do we cache records at most in the DHT?
    114  */
    115 #define GNUNET_CONSTANTS_DHT_MAX_EXPIRATION GNUNET_TIME_relative_multiply ( \
    116     GNUNET_TIME_UNIT_HOURS, 24)
    117 
    118 
    119 /**
    120  * Size of the `struct EncryptedMessage` of the core (which
    121  * is the per-message overhead of the core).
    122  */
    123 #define GNUNET_CONSTANTS_CORE_SIZE_ENCRYPTED_MESSAGE (24 + sizeof(struct \
    124                                                                   GNUNET_HashCode))
    125 
    126 /**
    127  * What is the maximum size for encrypted messages?  Note that this
    128  * number imposes a clear limit on the maximum size of any message.
    129  * Set to a value close to 64k but not so close that transports will
    130  * have trouble with their headers.
    131  *
    132  * Could theoretically be 64k minus (#GNUNET_CONSTANTS_CORE_SIZE_ENCRYPTED_MESSAGE +
    133  * #GNUNET_CONSTANTS_TRANSPORT_SIZE_OUTBOUND_MESSAGE), but we're going
    134  * to be more conservative for now.
    135  */
    136 #define GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE (63 * 1024)
    137 
    138 /**
    139  * Size of the CADET message overhead:
    140  * = sizeof (struct GNUNET_CADET_TunnelEncryptedMessage)
    141  * + sizeof (struct GNUNET_CADET_ChannelAppDataMessage)
    142  * + sizeof (struct GNUNET_CADET_ConnectionEncryptedAckMessage))
    143  *
    144  * Checked for correctness in gnunet-service-cadet_tunnel.c: GCT_init().
    145  */
    146 #define GNUNET_CONSTANTS_CADET_P2P_OVERHEAD 164
    147 
    148 /**
    149  * Maximum message size that can be sent on CADET.
    150  */
    151 #define GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE \
    152   (GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE \
    153    - GNUNET_CONSTANTS_CADET_P2P_OVERHEAD)
    154 
    155 /**
    156  * Largest block that can be stored in the DHT.
    157  */
    158 #define GNUNET_CONSTANTS_MAX_BLOCK_SIZE (62 * 1024)
    159 
    160 
    161 /**
    162  * K-value that must be used for the bloom filters in 'GET'
    163  * queries.
    164  */
    165 #define GNUNET_CONSTANTS_BLOOMFILTER_K 16
    166 
    167 
    168 #if 0                           /* keep Emacsens' auto-indent happy */
    169 {
    170 #endif
    171 #ifdef __cplusplus
    172 }
    173 #endif
    174 
    175 #endif
    176 
    177 /** @} */  /* end of group */