WrrScheduler

simple module

Implements weighted round-robin scheduling.

There is a weight associated with each input gate. Initially, each input gate gets as many tokens as their weight. When a packet is requested, then the first input gate is selected that has a packet and enough tokens, and one token is consumed. When there are waiting input packets, but there are not enough tokens to schedule one, then each token bucket is filled up.

Inheritance diagram

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

Used in compound modules

Name	Type	Description
DiffservQueue	compound module	This is an example queue that can be used in interfaces of DS core and edge nodes to support the AFxy (RFC 2597) and EF (RFC 3246) PHBs.
DSQueue1	compound module	Diffserv Queue used in Experiment 1.1 - 1.6 and 5.1.
DSQueue2	compound module	Diffserv Queue used in Experiment 2.1 - 2.4.

Used in

Name	Type	Description
WrrSchedulerTutorialStep	network	(no description)

Extends

Name	Type	Description
PacketSchedulerBase	simple module	Base module for various packet scheduler modules. Derived modules must implement a single packet scheduler function which determines the index of the input gate for the pulled packet.

Parameters

Name	Type	Default value	Description
displayStringTextFormat	string	"scheduled %p pk (%l)"	Determines the text that is written on top of the submodule, supports displaying pars, watches, and module-specific information
reverseOrder	bool	false
weights	string

Properties

Name	Value	Description
class	WrrScheduler
display	i=block/join

Gates

Name	Direction	Size	Description
in [ ]	input
out	output

Signals

Name	Type	Unit	Description
packetPulled	inet::Packet

Statistics

Name	Title	Source	Record	Unit	Interpolation Mode	Description
packetLengths	packet lengths	packetLength(packetPulled)	sum, histogram, vector	b	none	the statistical value is the length of the scheduled packet
dataRate	data rate	throughput(packetPulled)	vector	bps	linear	the statistical value is the data rate of the scheduled packets
packets	packets	packetPulled	count	pk		the statistical value is the scheduled packet

Source code

//
// Implements weighted round-robin scheduling.
//
// There is a weight associated with each input gate.
// Initially, each input gate gets as many tokens as their
// weight. When a packet is requested, then the first input
// gate is selected that has a packet and enough tokens,
// and one token is consumed. When there are waiting input
// packets, but there are not enough tokens to schedule one,
// then each token bucket is filled up.
//
simple WrrScheduler extends PacketSchedulerBase like IPacketScheduler
{
    parameters:
        string weights;
        @class(WrrScheduler);
}

File: src/inet/queueing/scheduler/WrrScheduler.ned