Re: [LARTC] Patch to allow for the ATM "cell tax"

From: Andreas Hasenack <ahasenack@terra.com.br>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] Patch to allow for the ATM "cell tax"
Date: Fri, 03 Mar 2006 19:34:17 +0000	[thread overview]
Message-ID: <20060303193416.GA3364@mandriva.com> (raw)
In-Reply-To: <1141284603.10264.168.camel@ras.pc.brisbane.lube>

On Fri, Mar 03, 2006 at 01:45:31PM -0500, Jason Boxman wrote:
> Andreas Hasenack said:
> > On Fri, Mar 03, 2006 at 11:18:00AM -0500, Jason Boxman wrote:
> >> On Friday 03 March 2006 08:43, Andreas Hasenack wrote:
> >> > On Thu, Mar 02, 2006 at 07:27:13PM -0500, Jason Boxman wrote:
> >> > > Any chance something like this can be applied to q_tbf?  It's been
> classful for a while and I find a tbf with a prio under it works
> quite well for my
> >> >
> >> > tbf qdisc is classfull?
> >>
> >> It has been since like 2.6.9, yes.  I was as surprised as you, but I use it
> >> with a leaf prio all the time and have for a year now.
> >
> > If this is correct, then the docs are really in bad shape. They are not
> only outdated, but just plain wrong in many cases.
> 
> Yes.
> 
> > But tbf is still not your regular classfull qdisc, or I'm missinterpreting
> things:
> 
> tc qdisc add dev eth0 root handle 1: tbf rate ${RATE}kbit \
>   burst 1600 limit 1
> tc qdisc add dev eth0 parent 1:1 handle 2: prio bands 4
> tc qdisc add dev eth0 parent 2:1 handle 10: pfifo limit 10
> tc qdisc add dev eth0 parent 2:2 handle 20: pfifo limit 10
> tc qdisc add dev eth0 parent 2:3 handle 30: pfifo limit 10
> tc qdisc add dev eth0 parent 2:4 handle 40: tbf rate \
>   $(($RATE-32))kbit burst 1600 limit 1
> tc qdisc add dev eth0 parent 40:1 handle 33: sfq perturb 1
> 
> But, you're right.  Classful is probably the wrong way of saying it.
> 
> Perhaps I meant you can attach a different queueing disipline besides using
> tbf.  It's more like tbf has a nested bfifo attached, which you can replace
> with anything you want since around 2.6.9.
> 
> I guess I'm used to using prio and tbf, where you can attach various leaf
> qdiscs and have more leaf qdiscs attached.  It's certainly not the same
> thing as cbq, htb, or hfsc.  Oops.  My bad.

Thanks for the example and the explanation, it was very helpful. It also
means I can try new things :)

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