Enum RtoStrategy 

pub enum RtoStrategy {
    Rfc6298,
    Quic,
    MinRtt {
        margin_us: u64,
    },
    Fixed {
        rto_us: u64,
    },
}

RTO computation strategy.

Different algorithms suit different link types:

• Rfc6298: Conservative, jitter-tolerant — good default for unknown links.
• Quic: Lower initial RTO (333ms vs 1s), tighter granularity — better for short flows and first-contact latency.
• MinRtt: Uses minimum observed RTT + margin — aggressive, best for stable low-jitter links (dedicated point-to-point Ethernet).
• Fixed: Constant timeout, no adaptation — ideal for local faces (Unix, SHM) where RTT is known and stable.

Variants

Rfc6298

RFC 6298 EWMA with Karn’s algorithm. Default.

Quic

QUIC (RFC 9002): lower initial RTO, tighter granularity.

MinRtt

Minimum observed RTT + configurable margin. Aggressive.

Fields

margin_us: u64

Added to min RTT to compute RTO (default: 5ms).

Fixed

Fixed RTO, no adaptation. For known-latency links.

Fields

rto_us: u64

Constant RTO value in microseconds.

Trait Implementations

impl Clone for RtoStrategy

fn clone(&self) -> RtoStrategy

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RtoStrategy

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for RtoStrategy

fn default() -> RtoStrategy

Returns the “default value” for a type.