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From source-files : 
Weighted Round Robin scheduler.
 
Written by Christian Worm Mortensen, worm@diku.dk.
 
Introduction
============
This module implements a weighted round robin queue with build-in classifier.
The classifier currently map each MAC or IP address (configurable either MAC
or IP and either source or destination) to different classes. Each such class
is called a band. Whan using MAC addresses only bridged packets can be
classified other packets go to a default MAC address.
 
Each band has a weight value, where 00, then every time a packet is transmitted, val
value is incremented by:
 
  decr**penalfact.
 
If penalfact<0, then every time a packet is transmitted, the weight1.val
value is decremented by:
 
  decr***(-penalfact)
 
This all makes it possible to give penalty to machines transferring much data.