Struct BandwidthEstimator 

pub struct BandwidthEstimator { /* private fields */ }

BBR-like Bandwidth Estimator

Implementations

impl BandwidthEstimator

pub fn new() -> Self

Create a new estimator starting in Startup state.

pub fn on_send(&mut self, bytes: u64)

Notify the estimator that bytes were sent (increases inflight).

pub fn on_ack(&mut self, sample: DeliverySample) -> u64

Process an ACK and update bandwidth estimates.

Returns the new recommended pacing rate (bytes/sec).

pub fn on_loss(&mut self, bytes: u64)

Notify a packet loss — triggers BBRv3 Fast Recovery.

Unlike earlier BBR versions that ignored loss, BBRv3 immediately backs off pacing rate and CWND relative to the lost bytes fraction.

pub fn set_app_limited(&mut self)

Mark the sender as application-limited (not sending at line rate).

Call this when there is no data to send but the CWND has room. Samples produced during app-limited periods won’t update the BW filter, preventing bandwidth underestimation.

pub fn is_app_limited(&self) -> bool

Whether the sender is currently considered application-limited.

pub fn pacing_rate(&self) -> u64

Get current recommended pacing rate (bytes/sec).

pub fn cwnd(&self) -> u64

Get recommended congestion window size (bytes).

pub fn bdp(&self) -> u64

Get the Bandwidth-Delay Product (BDP) in bytes.

pub fn inflight_bytes(&self) -> u64

Get current bytes in flight.

pub fn bottleneck_bandwidth(&self) -> u64

Get estimated bottleneck bandwidth (bytes/sec).

pub fn min_rtt(&self) -> Duration

Get minimum observed RTT.

pub fn state(&self) -> BbrState

Get current BBR state.

pub fn delivered_bytes(&self) -> u64

Get total bytes delivered.

pub fn round_count(&self) -> u32

Get the round count.

Trait Implementations

impl Debug for BandwidthEstimator

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

Formats the value using the given formatter.

impl Default for BandwidthEstimator

fn default() -> Self

Returns the “default value” for a type.