RE: [LARTC] Some questions remaining about TC

["Emmanuel SIMON" <manu@host.fr>]

First, thank you Stef for answering.
That's what I understood. I think my question was not enough precise (??)

My reel question/problem is why are parameters of the bandwidth (such as
rate, burts ...) set on classes rather than on qdiscs ?
I guess a class should only map a flow and should not know how this flow
will be sent. Especially that classes don't send packets. What is the reason
why it is done so ? And what if i don't specify parameters fir a leaf class
? Does it herit from the parent ?

Thanks once more
Manu

> -----Message d'origine-----
> De : lartc-admin@mailman.ds9a.nl
> [mailto:lartc-admin@mailman.ds9a.nl]De
> la part de Stef Coene
> Envoyé : mardi 10 juin 2003 20:55
> À : Emmanuel SIMON; lartc@mailman.ds9a.nl
> Objet : Re: [LARTC] Some questions remaining about TC
>
>
> On Monday 09 June 2003 23:18, Emmanuel SIMON wrote:
> > Hello everybody,
> >
> > I try to work with TC for a little while in my study and
> there still are a
> > few questions that I can\'t find any answer anywhere.
> >
> > Firts about qdisc and classes:
> >  - What is exactly the difference between qdsic and class ? They are
> > so \"intimately tied together\" that i\'m not sure not make
> the difference.
> > Why can\'t we have a qdsic HTB with a class CBQ within or reverse.
> >  - We have classes but is there any heritage (i\'m not sure
> it is the right
> > word) somewhere: between qdiscs, between classes or between
> qdiscs and
> > classes.
> A qdisc is a structure where a packet can be enqueued.  The
> most important is
> the root qdisc.  That's the qdisc that will proces all
> packets leaving a NIC.
> If you have classfull qdisc you can add classes.  A class
> will hold some part
> of the traffic.  So all packets leaving a nic are enqueued in
> the root qdisc
> and will be "forwarded" to a class.  Each class has 1 qdisc
> attached to it.
> So it's the qdisc attached to a class that will reponsible
> for sending the
> packet
>
> Sorry, can't help you with your other questions.
>
> Stef
>
> --
>
> stef.coene@docum.org
>  "Using Linux as bandwidth manager"
>      http://www.docum.org/
>      #lartc @ irc.oftc.net
>
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