Struct Bbr 

pub struct Bbr { /* private fields */ }

BBR sender-side state.

Implementations

impl Bbr

pub fn new(now: Instant, packet_bytes: u64) -> Self

pub fn on_send(&mut self, now: Instant, app_limited: bool) -> PacketSample

Snapshot the rate-sample state for a packet about to be sent. The caller stores the returned PacketSample with the packet and returns it on delivery via on_ack.

pub fn on_ack(&mut self, now: Instant, samples: &[PacketSample])

Process an ACK delivering samples (the snapshots of every packet newly known-received on this ACK, both the cumulative-ACK advance and any newly SACKed ids). The RTT is taken from the most recently sent acked packet, per the spec; picking that packet by its delivered snapshot also makes the rate sample robust to retransmits (a resent symbol keeps its old, low delivered, so it is never picked).

pub fn pacing_rate_bps(&self) -> f64

Target pacing rate in bytes/second: pacing_gain * BtlBw, minus the 1% margin. Zero until the first reliable bandwidth sample lands (the caller should then fall back to its own flow control).

pub fn cwnd_bytes(&self) -> u64

Target congestion window in bytes: cwnd_gain * BDP, floored at MIN_PIPE_CWND and reduced to PROBE_RTT_CWND during ProbeRTT.

pub fn has_estimate(&self) -> bool

Whether a usable bandwidth estimate exists yet.

pub fn btlbw_bps(&self) -> f64

BtlBw estimate (bytes/s), telemetry.