This module selectively drops packets, based on the available buffer space of the queues attached to its output.

The componenent has n input and n output gates (specified by the numGates parameter). Packets arrived at the ith input gate are transmitted on the ith output gate, or dropped.

The module sums the buffer lengths of its outputs and if enqueuing a packet would exceed the configured capacities, then the packet will be dropped instead.

Be attaching a ThresholdDropper to the input of a FIFO queue, you can compose a DropTailQueue. Shared buffer space can be modeled by attaching more FIFO queues to the output.

Parameters

Name	Type	Default value	Description
numGates	int	1	number of input and output gates
frameCapacity	int	-1	if positive, then limits the sum of frames in output queues
byteCapacity	int	-1	if positive, then limits the sum of bytes in the output queues

Properties

Name	Value	Description
display	i=block/downarrow

Gates

Name	Direction	Size	Description
in [ ]	input	numGates
out [ ]	output	numGates

Source code

//
// This module selectively drops packets, based on the available
// buffer space of the queues attached to its output.
//
// The componenent has n input and n output gates (specified by
// the numGates parameter). Packets arrived at the ith input
// gate are transmitted on the ith output gate, or dropped.
//
// The module sums the buffer lengths of its outputs
// and if enqueuing a packet would exceed the configured
// capacities, then the packet will be dropped instead.
//
// Be attaching a ThresholdDropper to the input of a FIFO
// queue, you can compose a DropTailQueue. Shared buffer
// space can be modeled by attaching more FIFO queues
// to the output.
//
simple ThresholdDropper
{
    parameters:
        int numGates = default(1); // number of input and output gates
        int frameCapacity = default(-1); // if positive, then limits the sum of frames in output queues
        int byteCapacity = default(-1);  // if positive, then limits the sum of bytes in the output queues
        @display("i=block/downarrow");

    gates:
        input in[numGates];
        output out[numGates];
}

File: src/inet/common/queue/ThresholdDropper.ned

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