CubicCongestionController class

RFC 8312 / RFC 9002 CUBIC congestion controller.

CUBIC uses a cubic function of elapsed time since last loss to grow cwnd: W_cubic(t) = C*(t - K)^3 + W_max where K = cubic_root(W_max * (1 - β_cubic) / C) and β_cubic = 0.7 (multiplicative decrease factor)

C is the CUBIC scaling factor (default 0.4).

Implemented types

Constructors

CubicCongestionController({int initialCwnd = 2, int packetSize = 1200})

Properties

appLimited → bool
Whether the application is currently limited (not sending enough to fill the congestion window).
no setteroverride
bytesInFlight → int
Bytes currently in flight.
no setteroverride
congestionWindow → int
Current congestion window in bytes.
no setteroverride
cwndInPackets → int
Current cwnd in packets (exposed for testing).
no setter
hashCode → int
The hash code for this object.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
wMax → int
W_max in packets (exposed for testing fast convergence).
no setter

Methods

canSend(int bytes) → bool
Whether sending bytes would exceed the congestion window.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
onAckReceived(int largestAcked, int newlyAckedBytes, DateTime now) → void
Process an ACK.
override
onECNCEMarked(int count) → void
React to ECN Congestion Experienced (CE) marks.
override
onPacketLost(int packetNumber, int lostBytes, DateTime now) → void
React to a detected packet loss.
override
onPacketSent(int packetNumber, int size) → void
Register a sent packet.
override
onPersistentCongestion() → void
React to persistent congestion being declared (RFC 9002 §7.6).
override
onRttSample(Duration rtt) → void
Record an RTT sample.
override
reset() → void
Reset to initial state.
override
setAppLimited(bool limited) → void
Set the application-limited state.
override
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited