From what I understand, there are many types of qdisc (HTB, CBQ, Prio, on and on) that you can invoke with the 'tc' linux command. HTB is the 'Hierarchical Token Bucket' that you hear a lot about because it works well. HTB should not be confused with 'Hierarchical TOLKIEN Bucket' that has something to do with the Lord of the Rings. 'Leaky Bucket' is a reference to my brains as I try to grasp bandwidth shaping.


Rich Comroe wrote:
Great reference and I've learned a tremendous amount from this list.  I learned 
that I have been mis-using the term Leaky Bucket.  I now understand that what 
Jason described to the list is Token Bucket (I was totally wet in my earlier 
reply calling it Leaky Bucket).

Radios that implement bw management vary considerably in sophistication of 
their bw management algorithms.  I'm really impressed with the Alvarion bw 
management.  Canopy has bw management built-in as well, but it seems less 
sophisticated.  I'm also impressed with what I've learned Linux advanced bw 
management can do at the head-end if your radios don't.

Given radios can be bridged or not, bw management in the in-radio 
implementations seem better ... because I don't see how head-end bw management 
can distinguish between bw to multiple destinations behind the same customer 
radio if the radios are bridged.  Even if the radios are not bridged, then I'd 
see in-radio bw management as 'still' better because bw limited at the customer 
radio doesn't chew up inbound rf capacity, while in head-end bw management the 
rf inbound capacity gets burned whether the traffic is ultimately limited or 

Anyways, I'm getting a great deal from the discussion, and would love to hear 
if other radios have built-in bw management and what method is use for 
comparison (any Trango users who could possibly comment?).

From: Ryan Langseth To: WISPA General List Sent: Thursday, January 25, 2007 12:44 AM
  Subject: Re: [WISPA] Advanced Bandwidth Management

  On Jan 24, 2007, at 8:25 PM, Rich Comroe wrote:

> Thanks much. I love it when you talk technical! Sorry, couldn't > help it...
> No really, the devil is always in the details in these things. > This is just the detail I was looking for. After I digest I hope I > may send questions your way off-list. Still hoping operators using > other brands will share what bw management algorithms they may have > built-in.
If you are looking for a better understanding of some of the traffic control systems, the Linux Advanced Routing and Traffic Control manual is a good place to look. Starting at chapter 9, it goes into some detail on how some of the the algorithms available work and how to implement them.

  > thanks again,
  > Rich


  Ryan Langseth
  Systems Administrator
  work: (218) 745-6030

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