Module adaptive_timeout 

Per-peer adaptive timeout estimation using the TCP-inspired SRTT/RTTVAR algorithm.

This module dynamically adjusts per-peer operation timeouts based on observed RTT history, ensuring timeouts are neither too aggressive nor too conservative. The algorithm is modelled after RFC 6298 (TCP retransmission timer computation).

Algorithm

On the first RTT sample for a peer:

SRTT   = R
RTTVAR = R / 2

On every subsequent sample:

RTTVAR = (1 - β) * RTTVAR + β * |SRTT - R|
SRTT   = (1 - α) * SRTT   + α * R
RTO    = SRTT + 4 * RTTVAR

where α = 1/8 and β = 1/4 by default (RFC 6298 recommendations).

Structs

AdaptiveTimeoutConfig

Configuration for PeerAdaptiveTimeout.

PeerAdaptiveTimeout

Per-peer adaptive timeout manager.

RttSample

A single RTT measurement for a specific peer.

TimeoutEstimate

The current timeout estimate and smoothed RTT state for a single peer.

TimeoutStats

Aggregate statistics across all tracked peers.