Re: [LARTC] quantum value for voip

[Victor Cassar <victorcassar@yahoo.com>]

Thanks Stef

Yep i missunderstood the quantum concept (it´s clear
now), but since my voip class was configured with
enough bw this doesn´t matter

Reading more on docum.org, i find hte possible cause
of the delays i was using sfq (128p queue) on the leaf
i removed sfq from the voip class


I will try also with other disciplines.. like tbf
just to have a deeper understanding of queuing in real
life applications

Are there any recomendation on which queuing
discipline to use with voip?
(my stats show 100 bytes per packet average in voip)

i´m doing more tests now and i´ll re re-read the full
lartc. doc

regards



--- Stef Coene <stef.coene@docum.org> wrote:
> On Thursday 13 February 2003 00:59, Victor Cassar
> wrote:
> > Well
> >
> > I understand why quantum should be at least equal
> to
> > mtu size
> >
> > but let´s think in this
> >
> > if i have a dsl link and i want to give more
> quality
> > to
> > "one voip user"
> > i´ve already solved the dsl upload problem
> transfering
> > the bottleneck to my shapping box.
> >
> > Should i change the quantum to a lower value for
> that
> > class?
> >
> > any ideas or comments about this?
> Do you know where quantum is used for?  It's for
> classes that are asking for 
> remaining bandwidth.  So if that "one voip user" is
> never asking for more 
> then the configured rate of its class, quantum is
> never used.  So it really 
> depends on how you configured the classes to answer
> that question.
> 
> And taking a quantum of 10 byte is not "wrong".  But
> if you send 1000byte and 
> your quantum is 10byte, htb will use 10byte in it's
> calculations.  So it can 
> disturb the setup, but nothing bad will happen.
> 
> Stef
> 
> -- 
> 
> stef.coene@docum.org
>  "Using Linux as bandwidth manager"
>      http://www.docum.org/
>      #lartc @ irc.oftc.net
> 
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