Struct RttEstimator 

pub struct RttEstimator { /* private fields */ }

Available on crate feature transport only.

RTT estimator implementing RFC 6298.

This struct maintains smoothed RTT (SRTT) and RTT variance (RTTVAR) values, and computes an adaptive Retransmission Timeout (RTO).

Implementations

impl RttEstimator

pub fn new() -> Self

Create a new RTT estimator with initial values.

pub fn update(&mut self, sample: Duration)

Update RTT estimate with a new sample.

Implements RFC 6298 RTT calculation:

• First measurement: SRTT = sample, RTTVAR = sample / 2
• Subsequent: RTTVAR = 0.75 * RTTVAR + 0.25 * |SRTT - sample|
• SRTT = 0.875 * SRTT + 0.125 * sample

pub fn srtt(&self) -> Duration

Get the current smoothed RTT.

pub fn srtt_ms(&self) -> f64

Get the current smoothed RTT in milliseconds.

pub fn rttvar(&self) -> Duration

Get the current RTT variance.

pub fn rto(&self) -> Duration

Get the current retransmission timeout.

pub fn is_initialized(&self) -> bool

Check if the estimator has been initialized with at least one sample.

pub fn backoff(&mut self) -> Duration

Apply exponential backoff to RTO (used after timeout).

Returns the new RTO after doubling (capped at MAX_RTO).

pub fn reset_backoff(&mut self)

Reset RTO to initial value (e.g., after successful transmission).

Trait Implementations

impl Clone for RttEstimator

fn clone(&self) -> RttEstimator

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RttEstimator

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

Formats the value using the given formatter.

impl Default for RttEstimator

fn default() -> Self

Returns the “default value” for a type.