Re: WFQ: Rounded packet size

From: Petr Lapukhov (petr@internetworkexpert.com)
Date: Mon Dec 15 2008 - 10:56:19 ARST

Hi,
Most likely, the book refers to the "round number" which is the size of the
last packet sent by the scheduler. This value is used to initialize every
new flow queue byte counter. You can read a detailed description of WFQ
algorithm (explaning how this round number is used btw) here:

http://www.internetworkexpert.com/downloads/IEWB-RS-VOL-I-V5.Section.10.QoS.teaser.pdf

The second task in dedicated to WFQ. Understanding the internal working of
WFQ is very important since the same scheduling procedure is used by CBWFQ.

HTH, 

-- 
Petr Lapukhov, CCIE #16379 (R&S/Security/SP/Voice)
petr@internetworkexpert.com

Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Outside US: 775-826-4344

2008/12/14 Bit Gossip <bit.gossip@chello.nl>

> Experts,
> any idea on how these value are calculated for the WFQ min-max
> algorithm?
> In "CCIE Practical Studies Volume II" chapter "Chapter 6. QoS b  Rate
> Limiting and Queuing Traffic" there is an example where 60 and 700 are
> used. But how are these value determined?
> "During the WFQ process, packet size is noted when new packets arrive.
> If the IP flow that they belong to is new, a rounded packet size is also
> used."
> Tnx,
> bit
>
>
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