WFQ
Weighted fair queuing (WFQ) is a data packet scheduling technique allowing different scheduling priorities to statistically multiplexed data flows.
WFQ is a generalization of fair queuing (FQ). Both in WFQ and FQ, each data flow has a separate FIFO queue. In FQ, with a link data rate of R, at any given time the N active data flows (the ones with non-empty queues) are serviced simultaneously, each at an average data rate of R/N. Since each data flow has its own queue, an ill-behaved flow (who has sent larger packets or more packets per second than the others since it became active) will only punish itself and not other sessions.
As opposed to FQ, WFQ allows different sessions to have different service shares. If N data flows currently are active, with weights w_1, w_2 ... w_N, data flow number i will achieve an average data rate of
\frac{Rw_i}{(w_1+w_2+...+w_N)}
It can be proven that when using a network with WFQ switches and a data flow that is leaky bucket constrained, an end-to-end delay bound can be guaranteed. By regulating the WFQ weights dynamically, WFQ can be utilized for controlling the quality of service, for example to achieve guaranteed data rate.
Proportional fairness can be achieved by setting the weights to w_i=1/c_i, where c_i is the cost per data bit of data flow i. For example in CDMA spread spectrum cellular networks, the cost may be the required energy (the interference level), and in dynamic channel allocation systems, the cost may be the number of nearby base station sites that can not use the same frequency channel, in view to avoid co-channel interference.

This is an excerpt from the article WFQ from the Wikipedia free encyclopedia. A list of authors is available at Wikipedia.
The article WFQ at en.wikipedia.org was accessed 104 times in the last 30 days. (as of: 06/03/2013)
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Weighted fair queuing - Wikipedia, the free encyclopedia
Weighted fair queuing (WFQ) is a data packet scheduling technique allowing different scheduling priorities to statistically multiplexed data flows. WFQ is a ...
en.wikipedia.org/wiki/Weighted_fair_queuing
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Weighted Fair Queuing (WFQ) - Cisco Systems
WFQ is one of Cisco's premier queuing techniques. It is a flow-based queuing algorithm that does two things simultaneously: It schedules interactive traffic to the ...
www.cisco.com/en/US/tech/tk543/tk544/tk718/tsd_technology_support_sub-protocol_home.html
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(WFQ) and Virtual Clock
1. Packet Scheduling: (. ) Weighted Fair Queueing (WFQ) and Virtual Clock (VC). 2/25/2013. 1. WFQ and VC scheduling (Simon S. Lam) ...
www.cs.utexas.edu/users/lam/386p/slides/Packet_Scheduling_algorithms.pdf
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What is weighted fair queueing (WFQ)? - Definition from WhatIs.com
Weighted fair queueing (WFQ) is a method of automatically smoothing out the flow of data in packet-switched communication networks by sorting packets to ...
searchnetworking.techtarget.com/definition/weighted-fair-queueing
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Weighted Fair Queuing (WFQ) - McMaster University
4DN4 - WFQ, pg 2 .... Let a Weighted Fair Queueing (WFQ) Server run in parallel with an ideal ... The WFQ server only services whole IP packets (it doesn't ...
www.ece.mcmaster.ca/faculty/teds/COURSES/4DN4-folder/CLASSNOTES/2013-4-4DN4-WFQ-2pp.pdf
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Weighted Fair Queuing – WFQ » OKS's CCIE Voice Blog
Feb 27, 2010 ... WFQ is enabled by default on slow-speed interfaces (< 2,048 Mbps). WFQ allocates a queue for each flow, for as many as 256 flows by default.
ccievoice.ksiazek.be/?p=395
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EECS 122 Supplementary Notes on WFQ - Kfall.com
EECS 122. Supplementary Notes on WFQ. Kevin Fall, kfall@cs.berkeley.edu. Weighted Fair Queuing (WFQ). • Textbook is not quite precise on its description of ...
kfall.net/ucbpage/EE122/wfq-notes/wfq-notes.pdf
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QOS: 2.6. WFQ, Weighted Fair Queuing
WFQ, Weighted Fair Queuing. Le Weighted Fair Queuing est une discipline de file d'attente hautement élaboré très utilisé dans le monde de la QoS. Il s'agit en ...
moodle.um5s.ac.ma/moodle/mod/resource/view.php?id=303
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WFQ - Nislab
WFQ is an approximation of GPS, which does not make the assumption of infinitesimal packet size. GPS is the ideal method for best-effort and interactive ...
nislab.bu.edu/sc546/sc441Spring2003/wfq/wfq.htm
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Weighted Fair Queuing - MyNetworkingWiki
Weighted Fair Queuing. From MyNetworkingWiki. QoS. Introduction. One of the big difference between WFQ and other queuing tools is that it classifies packets ...
mynetworkingwiki.com/index.php/Weighted_Fair_Queuing
Search results for "WFQ"
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WFQ in science
[PDF]Weighted Fair Queuing (WFQ) - McMaster University
McMaster University .... Let a Weighted Fair Queueing (WFQ) Server run in parallel with an ideal ... The WFQ server only services whole IP packets (it doesn't ...
[PDF]Lecture 7, part 2
University of Bologna – Italy. Visiting Assistant Professor at SIS, Telecom Program. Slides partly ... Generalized Processor Sharing. – Weighted Fair Queuing ...
[PDF]Adaptive Weighted Fair Queueing with Pritority (AWFQP) Scheduler ...
Mar 11, 2008 ... Adaptive Weighted Fair Queueing with Pritority (AWFQP) Scheduler ... Department of Computer Engineering and Science, Yuan-Ze University ...
[PDF]Tuning the weights in WFQ schedulers for the maximization of ...
University of California, Berkeley, CA 94720 email: {emagana, dmorato ... This paper shows a configuration scheme for networks with WFQ schedulers that ...
Distributed WFQ Scheduling in Buffered Crossbars (FORTH-ICS)
Distributed WFQ Scheduling in Buffered Crossbar (CICQ) Switches. Nikolaos ... Dept. of Computer Science, University of Crete, Heraklion, Crete, Greece ...
[PDF]A COMPARATIVE STUDY OF DIFFERENT QUEUING ...
DAFFODIL INTERNATIONAL UNIVERSITY JOURNAL OF SCIENCE AND ... WFQ . The study has been carried out on some issues like: Traffic dropped Traffic ...
[PDF]Analysis and Simulation of a Fair Queueing Algorithm
SRINIVASAN KESHAV. Computer Science Division. Department of EECS. University of California at Berkeley. Berkeley,. CA 94720,. U. S.A.. SCOTT SHENKER ...
[PDF]A Novel Sliding Weighted Fair Queueing Scheme for ... - IEEE
National Dong Hwa University. Hualien, Taiwan ... Abstract. Weighted Fair Queueing (WFQ) is a popular ... scheduling and WFQ could not be used at the same ...
A radio-aware worst-case fair weighted fair queuing scheduler for ...
Mar 21, 2012 ... A radio-aware worst-case fair weighted fair queuing scheduler for WiMAX networks. Rosario G. Garroppo,; Stefano Giordano,; Davide Iacono, ...
QoS Lab 7 - Class-Based Weighted Fair Queuing - Network World
Oct 15, 2010 ... This video configures CB-WFQ to give different amounts of bandwidth ... World Resort and a network manager for Eastern Kentucky University.
Books on the term WFQ
Voice Over IP Fundamentals
Voice Over IP Fundamentals
2006
CB-WFQ (CB=Class Based) CB-WFQ has all the benefits of WFQ, with the additional functionality of providing granular support for ... CB-WFQ enables you to define what constitutes a class based on criteria that exceed the confines of flow.
Cisco Voice Over Frame Relay, Atm, and Ip
Cisco Voice Over Frame Relay, Atm, and Ip
Stephen McQuerry, Kelly McGrew, Stephen Foy, 2001
The fundamental differences between WFQ and CBWFQ (they use the same internal algorithm) are: • For WFQ the weight of the flow is given (derived from IP Precedence) and the BW calculated • For CBWFQ the BW is given, and the resulting ...
Ip Quality of Service
Ip Quality of Service
Srinivas Vegesna, 2001
WFQ limits its drops to the most active flows, whereas FIFO might drop from any flow. Therefore, WFQ should encourage the most active flows to scale back without affecting the smaller flows. Because the median flow duration in the Internet is ...
Cisco Ios 12.0 Quality of Service
Cisco Ios 12.0 Quality of Service
1999
This chapter describes the tasks for configuring QoS weighted fair queuing iWFQ) and Distributed WFQ tDWFQ) on a router. ... WFQ provides traffic priority management that automatically sorts among individual traffic streams without requiring ...
Inside Cisco IOS Software Architecture
Inside Cisco IOS Software Architecture
Russ White, Vijay Bollapragada, Curtis Murphy, 2008
IOS has two implementations of platform-independent WFQ: ' Flow-Based WFQ ° Class-Based CBWFQ Flow-Based ... Flow-Based WFQ is a legacy congestion management feature in IOS and has been available since IOS version 11.0; we ...
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WFQ
VIP Weekly Fun Question for May 25, 2013
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Router Output QueueDavid Sudjiman | David Sudjiman
Output Queue For the egress queue, router interface uses two queues. The first queue is, like Input queue, Output queue is a software queue. The default
www.davidsudjiman.info/2013/05/20/router-output-queue/
Does checkpoint support WFQ and LLQ?
May i ask checkpoint support WFQ and LLQ or not? as i know, this two queuing method is Cisco proprietary if not, what qos mechanisms is used on
cpug.org/forums/qos-quality-service-formerly-floodgate-1/18623-does-checkpoint-support-wfq-llq.html
Average Bandwidth Allocation Model of WFQ
Modelling and Simulation in Engineering aims at providing a forum for the discussion of formalisms, methodologies and simulation tools that are intended to support the new, broader interpretation of Engineering. Competitive pressures of Global Economy have had a profound effect on the manufacturing in Europe, Japan and the USA with much of the production being outsourced. In this context the traditional interpretation of engineering profession linked to the actual manufacturing needs to be broadened to include the integration of outsourced components and the consideration of logistic, economical and human factors in the design of engineering products and services.
www.hindawi.com/journals/mse/2012/301012/
Louis Vuitton OutletTdeJ wfq (Page 1) / Raw Dairy Ads / Raw Dairy Forum
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WiMAX simulation with WFQ algoritm - WiMAX360
Hi..I'am new in thus forum WiMAX 360. I want to make simulation about scheduling in WiMAX network withns-2.29.I use WFQ algoritm as the scheduler, but I don't…
wimax360.com/forum/topics/wimax-simulation-with-wfq
www.mmfengxiong.net/vklkw/hex.wfq – Virus Scan Results
Is http://www.mmfengxiong.net/vklkw/hex.WFQ safe to visit? Check out our virus and malware scan results BEFORE you visit.
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CB-WFQ misconceptions « ipSpace.net by @ioshints
Reading various documents describing Class-Based Weighted-Fair-Queueing (CB-WFQ) one gets the impression that the following configuration … class-map match-all High match access-group name High ! policy-map WAN class High bandwidth percent 50 ! interface Serial0/1/0 bandwidth 256 service-policy output WAN ! ip access-list extended High permit ip any host 10. 0.
blog.ioshints.info/2009/11/cb-wfq-misconceptions.html
Yeslab Hans技术文档:QOS技术之队列机制-WFQ(加权公平队列)详细讲解 – Yeslab Hans's Blog
WFQ(Weighted Fair Queuing) 加权公平队列(基于流的) a>加权公平队列是低速链路(2.048 Mbps 以下)上的默认设置 b>引入FT(完成时间)和WFT(最坏完成时间) c>丢弃机制引入HQO(hold-queue out)和CDT(congestive discard threshold) e>FT-finished time 数据包来的时刻加上数据包的长度: f..
www.yeslab.net/hans/164.html
What happens when WFQ dynamic conversations are exceeded? - IEOC - INE's Online Community
INE's Online Community - a place for CCIE and CCENT candidates to connect, share, and learn.
ieoc.com/forums/p/24313/185574.aspx
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