Source file gs_default_parameters.ml

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(** This module defines the default values for simple Gossip parameters and
    limits. These values are used or re-defined in the DAL node before
    instantiating the Gossipsub worker. *)

(* FIXME: https://gitlab.com/tezos/tezos/-/issues/5559

   Document why we choose these default values for GS parameters.

   Note: The current default value was copied from The Go implementation *)

module Topic_score = struct
  let time_in_mesh_weight = 1.0

  let time_in_mesh_cap = 3600.0

  let time_in_mesh_quantum = Types.Span.of_float_s 1.0

  let first_message_deliveries_weight = 1.0

  let first_message_deliveries_cap = 2000

  let first_message_deliveries_decay = 0.5

  (* This part of the score is deactivated because we cannot predict a
     delivery weight. *)
  let mesh_message_deliveries_weight = 0.

  let mesh_message_deliveries_window = Types.Span.of_float_s 0.01

  let mesh_message_deliveries_activation = Types.Span.of_int_s 5

  let mesh_message_deliveries_cap = 100

  let mesh_message_deliveries_threshold = 20

  let mesh_message_deliveries_decay = 0.5

  (* This part of the score is deactivated because we cannot predict a
     delivery weight. *)
  let mesh_failure_penalty_weight = 0.

  let mesh_failure_penalty_decay = 0.5

  let invalid_message_deliveries_weight = ~-.1.

  let invalid_message_deliveries_decay = 0.3
end

module Score = struct
  let topic_score_cap = Some 3600.

  let behaviour_penalty_weight = ~-.10.0

  let behaviour_penalty_threshold = 0.0

  let behaviour_penalty_decay = 0.2

  let app_specific_weight = 10.

  let decay_zero = 0.1
end

module Limits = struct
  let max_recv_ihave_per_heartbeat = 10

  let max_sent_iwant_per_heartbeat = 5000

  let max_gossip_retransmission = 3

  let degree_optimal = 6

  let publish_threshold = 0.

  let gossip_threshold = 0.

  let do_px = true

  let peers_to_px = 16

  let accept_px_threshold = 0.

  let unsubscribe_backoff = Types.Span.of_int_s 10

  let graft_flood_threshold = Types.Span.of_int_s 10

  let prune_backoff = Types.Span.of_int_s 60

  let retain_duration = Types.Span.of_int_s 10

  let fanout_ttl = Types.Span.of_int_s 60

  let heartbeat_interval = Types.Span.of_int_s 1

  let backoff_cleanup_ticks = 15

  let score_cleanup_ticks = 1

  let degree_low = 5

  let degree_high = 12

  let degree_score = 4

  let degree_out = 2

  let degree_lazy = 6

  let gossip_factor = 0.25

  let history_length = 5

  let history_gossip_length = 3

  let opportunistic_graft_ticks = 60L

  let opportunistic_graft_peers = 2

  let opportunistic_graft_threshold = 1.

  let seen_history_length = 120
end

module Peer_filter = struct
  let peer_filter _peer _action = true
end