Package: inet.queueing.queue


compound module

Combines a packet queue with random early detection (RED) dropper.

RedDropper IPacketQueue

Usage diagram

The following diagram shows usage relationships between types. Unresolved types are missing from the diagram.

Inheritance diagram

The following diagram shows inheritance relationships for this type. Unresolved types are missing from the diagram.


Name Type Description
CompoundPacketQueueBase compound module

This compound module serves as a base module for complex packet queues formed by combining several queueing components.


Name Type Default value Description
displayStringTextFormat string "contains %p pk (%l) pushed %u created %c\n pulled %o removed %r dropped %d"

determines the text that is written on top of the submodule

packetCapacity int -1

maximum number of packets in the queue, no limit by default

dataCapacity int -1b

maximum total length of packets in the queue, no limit by default

dropperClass string ""

determines which packets are dropped when the queue is overloaded, packets are not dropped by default; the parameter must be the name of a C++ class which implements the IPacketDropperFunction C++ interface and is registered via Register_Class


Name Value Description
display i=block/queue
class CompoundPacketQueueBase
defaultStatistic queueLength:vector


Name Direction Size Description
in input
out output


Name Type Unit
packetRemoved inet::Packet
packetPushStarted inet::Packet
packetDropped inet::Packet
packetPushEnded inet::Packet?
packetPulled inet::Packet


Name Title Source Record Unit Interpolation Mode
queueBitLength queue bit length warmup(atomic(constant0(localSignal(packetPushEnded)) + sum(packetLength(localSignal(packetPushStarted))) - sum(packetLength(localSignal(packetPulled))) - sum(packetLength(localSignal(packetRemoved))) - sum(packetLength(localSignal(packetDropped))))) last, max, timeavg, vector b sample-hold
queueLength queue length warmup(atomic(constant0(localSignal(packetPushEnded)) + count(localSignal(packetPushStarted)) - count(localSignal(packetPulled)) - count(localSignal(packetRemoved)) - count(localSignal(packetDropped)))) last, max, timeavg, vector pk sample-hold
droppedPacketsQueueOverflow dropped packets: queue overflow packetDropReasonIsQueueOverflow(localSignal(packetDropped)) count pk none
queueingTime queueing times queueingTime(localSignal(packetPulled)) histogram, vector s none
incomingDataRate incoming datarate throughput(localSignal(packetPushStarted)) vector bps linear
flowQueueingTime flow queueing times queueingTime(demuxFlow(localSignal(packetPulled))) histogram, vector s none
incomingPacketLengths incoming packet lengths packetLength(localSignal(packetPushStarted)) sum, histogram, vector b none
flowIncomingDataRate flow specific incoming data rate throughput(flowPacketLength(demuxFlow(localSignal(packetPushStarted)))) vector bps linear
outgoingDataRate outgoing datarate throughput(localSignal(packetPulled)) vector bps linear
outgoingPacketLengths outgoing packet lengths packetLength(localSignal(packetPulled)) sum, histogram, vector b none
droppedPacketLengthsQueueOverflow dropped packet lengths: queue overflow packetLength(packetDropReasonIsQueueOverflow(localSignal(packetDropped))) sum, vector b none
flowOutgoingDataRate flow specific outgoing data rate throughput(flowPacketLength(demuxFlow(localSignal(packetPulled)))) vector bps linear
incomingPackets incoming packets localSignal(packetPushStarted) count pk
outgoingPackets outgoing packets localSignal(packetPulled) count pk

Direct method calls (observed)

call tofunctioninfo

Called methods (observed)

functioninfocall from

Region Tagging operations (observed)


Unassigned submodule parameters

Name Type Default value Description
red.displayStringTextFormat string "dropped %d/%p pk (%k/%l)"

determines the text that is written on top of the submodule

red.backpressure bool false
red.collectionModule string ""
red.wq double 0.002

weight of the current queue length in the averaged queue length, in range [0.0, 1.0]

red.minth double 5

minimum threshold for avg queue length

red.maxth double 50

maximum threshold for avg queue length (=buffer capacity), in range (minth,packetCapacity]

red.maxp double 0.02

maximum value for pbs, in range [0.0, 1.0]

red.pkrate double 150

average packet rate for calculations when queue is empty

red.useEcn bool false

if enabled, packets are marked with ECN if applicable

red.packetCapacity int int(maxth)

packets are dropped if queue length is greater

Source code

// Combines a packet queue with random early detection (RED) dropper.
module RedDropperQueue extends CompoundPacketQueueBase
        red: RedDropper {
        fifo: <default("PacketQueue")> like IPacketQueue {
        in --> { @display("m=n"); } -->;
        red.out -->;
        fifo.out --> { @display("m=s"); } --> out;
File: src/inet/queueing/queue/RedMarkerQueue.ned