Struct quinn_proto::AckFrequencyConfig

pub struct AckFrequencyConfig { /* private fields */ }

Parameters for controlling the peer’s acknowledgement frequency

The parameters provided in this config will be sent to the peer at the beginning of the connection, so it can take them into account when sending acknowledgements (see each parameter’s description for details on how it influences acknowledgement frequency).

Quinn’s implementation follows the fourth draft of the QUIC Acknowledgement Frequency extension. The defaults produce behavior slightly different than the behavior without this extension, because they change the way reordered packets are handled (see AckFrequencyConfig::reordering_threshold for details).

Implementations

impl AckFrequencyConfig

pub fn ack_eliciting_threshold(&mut self, value: VarInt) -> &mut Self

The ack-eliciting threshold we will request the peer to use

This threshold represents the number of ack-eliciting packets an endpoint may receive without immediately sending an ACK.

The remote peer should send at least one ACK frame when more than this number of ack-eliciting packets have been received. A value of 0 results in a receiver immediately acknowledging every ack-eliciting packet.

Defaults to 1, which sends ACK frames for every other ack-eliciting packet.

pub fn max_ack_delay(&mut self, value: Option<Duration>) -> &mut Self

The max_ack_delay we will request the peer to use

This parameter represents the maximum amount of time that an endpoint waits before sending an ACK when the ack-eliciting threshold hasn’t been reached.

The effective max_ack_delay will be clamped to be at least the peer’s min_ack_delay transport parameter, and at most the greater of the current path RTT or 25ms.

Defaults to None, in which case the peer’s original max_ack_delay will be used, as obtained from its transport parameters.

pub fn reordering_threshold(&mut self, value: VarInt) -> &mut Self

The reordering threshold we will request the peer to use

This threshold represents the amount of out-of-order packets that will trigger an endpoint to send an ACK, without waiting for ack_eliciting_threshold to be exceeded or for max_ack_delay to be elapsed.

A value of 0 indicates out-of-order packets do not elicit an immediate ACK. A value of 1 immediately acknowledges any packets that are received out of order (this is also the behavior when the extension is disabled).

It is recommended to set this value to TransportConfig::packet_threshold minus one. Since the default value for TransportConfig::packet_threshold is 3, this value defaults to 2.

Trait Implementations

impl Clone for AckFrequencyConfig

fn clone(&self) -> AckFrequencyConfig

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for AckFrequencyConfig

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

Formats the value using the given formatter.

impl Default for AckFrequencyConfig

fn default() -> Self

Returns the “default value” for a type.