About burst and cburst in htb (Re: [LARTC] htb faq)
On Mon, 27 May 2002, Martin Devera wrote:
rate has burst
ceil has cburst
So it means that when traffic is borrowed cburst is used, else burst ?
Hmm .. do you understand the difference between ceil rate ?
Yes, rate is the guaranteed bandwitdh, ceil is the maximum bandwidth.
Everytime when ceil is computed then cburst is used and vice versa ..
I will try to answer to myself:
-
| |
| |
-
Say you have a burst like this. When transmiting all the available
bandwitdh is used by the burst.
At the next oportunity, htb will ask himself:
its my turn, how long must be this burst ?
If the computed bandwidth used by this class is over rate (but less than
ceil, the length will be cburst. Else it will be burst).
Is it this ??
--
__o
_ \_
(_)/(_)
Saludos de Julián
EA4ACL
-.-
Foro Wireless Madrid
http://opennetworks.rg3.net
___
LARTC mailing list / [EMAIL PROTECTED]
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
Re: About burst and cburst in htb (Re: [LARTC] htb faq)
Everytime when ceil is computed then cburst is used and vice versa .. I will try to answer to myself: - | | | | - Say you have a burst like this. When transmiting all the available bandwitdh is used by the burst. At the next oportunity, htb will ask himself: its my turn, how long must be this burst ? If the computed bandwidth used by this class is over rate (but less than ceil, the length will be cburst. Else it will be burst). Is it this ?? --- Please don't be impatient ! I didn't respond to your mail instantly and you sent me it again. --- 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 that by raising burst you higher probability that next question whether the class is under its rate will be answered yes. devik ___ LARTC mailing list / [EMAIL PROTECTED] http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
Re: About burst and cburst in htb (Re: [LARTC] htb faq)
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 -.- ___ LARTC mailing list / [EMAIL PROTECTED] http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
