Re: About burst and cburst in htb (Re: [LARTC] htb faq)

["Julián Muñoz" <jmunoz@telefonica.net>]

On Mon, 27 May 2002, Martin Devera wrote:


> I don't think so. The burst values are used by htb to answer
> question "is the class over rate" and "is the class over ceil".
> The rate and ceil estimator is coupled by pairs rate/burst and
> ceil/cburst. It is by definition of leaky bucket.

So is it the leak size ?

>
> So that by raising burst you higher probability that next question
> whether the class is under its rate will be answered "yes".

Ok. Well, in fact I asked this because I want to understand a bit
better why use bursts:

Do really bursts decrement the medium time of response of the affected
class ?

(I suppose that yes, as say Devik in the manual "Well it is cheap and
simple way how to improve response times on congested link.").


If I have 2 classes in paralell, exactly with the same parameters, except
one with a little (default) burst, another with a big burst (say burst= X
), receiving the same N bits a the same time ( N < X ). Will the second
class empty before the first one ?

Now suppose that this classes during this experiment use more bandwidth
than their "rate" parameter. Is both have the same "cburst" parameter
(little cburst (default)), are they identical during this time ? Should I
always set burst AND cburst in order to have the expected result ?

What I want to do is prioritize some interactive traffic (and understant
why it works :-)



Thanks :-)

-- 
Saludos de Julián
EA4ACL
-.-

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