[LARTC] PRIO type qdisc

[LARTC] PRIO type qdisc

[Paul C. Diem]

I'm looking for a PRIO type qdisc which will prioritize packets (either
based on DS or filters). Unlike PRIO, I need all the classes to flow into
a single qdisc (HTB). For example:

         PRIO
           |
  +--------+--------+
  |        |        |
Band0    Band1    Band2
  |        |        |
  +--------+--------+
           |
          HTB

Does such a qdisc exist or is there a way to get all the PRIO classes to
flow into a single qdisc?


Paul C. Diem
PCDiem@FoxValley.net

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Re: [LARTC] PRIO type qdisc

[Stef Coene]

On Tuesday 17 December 2002 07:05, Paul C. Diem wrote:
> I'm looking for a PRIO type qdisc which will prioritize packets (either
> based on DS or filters). Unlike PRIO, I need all the classes to flow into
> a single qdisc (HTB). For example:
>
>          PRIO
>
>   +--------+--------+
>
> Band0    Band1    Band2
>
>   +--------+--------+
>
>           HTB
>
> Does such a qdisc exist or is there a way to get all the PRIO classes to
> flow into a single qdisc?
There is no such qdisc.  And I don't think there is such way.

But why do you want to do this?  

Stef

-- 

stef.coene@docum.org
 "Using Linux as bandwidth manager"
     http://www.docum.org/
     #lartc @ irc.oftc.net

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Re: [LARTC] PRIO type qdisc

[Paul C. Diem]

On Wed, 18 Dec 2002, Stef Coene wrote:

> On Tuesday 17 December 2002 07:05, Paul C. Diem wrote:
> > I'm looking for a PRIO type qdisc which will prioritize packets (either
> > based on DS or filters). Unlike PRIO, I need all the classes to flow into
> > a single qdisc (HTB). For example:
> >
> >          PRIO
> >
> >   +--------+--------+
> >
> > Band0    Band1    Band2
> >
> >   +--------+--------+
> >
> >           HTB
> >
> > Does such a qdisc exist or is there a way to get all the PRIO classes to
> > flow into a single qdisc?
> There is no such qdisc.  And I don't think there is such way.
>
> But why do you want to do this?

Here's what I'm really trying to accomplish: I have several links of
various speeds. Some of the links feed from other links. For example,

                   +---> B                 +---> E
                   |                       |
A <---< 10Mbps >---+---> C <---< 6Mbps >---+---> F <---< 6Mbps >---> H
                   |
                   +---> D <---< 3Mbps >---> G


ie. I have a 10Mbps link from A which feeds B, C and D, a 6Mbps link from
C which feeds E and F, a 6Mbps link from F which feeds H and a 3Mbps link
from D which feeds G. I need to provide multiple levels of service (based
on maximum bandwidth and packet priority) at each node. What I'd like to
do it use htb to cap the bandwidth and some sort of prio qdisc to
prioritize packets. The problem with prio is that I'd need to define the
entire remaining "link tree" for each band at each level. It seems I need
a qdisc which will prioritize packets based on some mark (ie. DS) but only
had one class (instead of as many classes at there are bands like prio).

It looks like gred may do something like this but I can't find any
detailed information on gred. If I'm going about this all wrong, please
let me know.

Paul C. Diem
PCDiem@FoxValley.net

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Re: [LARTC] PRIO type qdisc

[Hayden Myers]

Hayden Myers	
Support Manager
Skyline Network Technologies	
hayden@spinbox.com
(410)583-1337 option 2


> > > I'm looking for a PRIO type qdisc which will prioritize packets (either
> > > based on DS or filters). Unlike PRIO, I need all the classes to flow into
> > > a single qdisc (HTB). For example:
> > >
> > >          PRIO
> > >
> > >   +--------+--------+
> > >
> > > Band0    Band1    Band2
> > >
> > >   +--------+--------+
> > >
> > >           HTB
> > >
> > > Does such a qdisc exist or is there a way to get all the PRIO classes to
> > > flow into a single qdisc?
> > There is no such qdisc.  And I don't think there is such way.
> >
> > But why do you want to do this?
> 
I had wanted to do similar things a while back before 10 other things beat
me over the head and set me back.  It's funny because the above topology
is exactly what I had envisioned but read that it was impossible.  My
setup is to have a number of users who have bandwidth limiting based on an
ip but also does priority shaping as well.  I finally decided that I could
have a top level htb qdisc for the total box bandwidth with seperate
classes for the users below the box bandwidth qdisc.  Underneath each
user's class I thought that I could possibly attach a prio qdisc to do
independent priority scheduling.  I don't know if this works.  It was just
a thought I had.  If think the manpage shows that you can attach a prio
to any class.  Does this work and is it a feasable setup?    

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Re: [LARTC] PRIO type qdisc

[Paul C. Diem]

On Wed, 18 Dec 2002, Hayden Myers wrote:

> > > > I'm looking for a PRIO type qdisc which will prioritize packets (either
> > > > based on DS or filters). Unlike PRIO, I need all the classes to flow into
> > > > a single qdisc (HTB). For example:
> > > >
> > > >          PRIO
> > > >
> > > >   +--------+--------+
> > > >
> > > > Band0    Band1    Band2
> > > >
> > > >   +--------+--------+
> > > >
> > > >           HTB
> > > >
> > > > Does such a qdisc exist or is there a way to get all the PRIO classes to
> > > > flow into a single qdisc?
> > > There is no such qdisc.  And I don't think there is such way.
> > >
> > > But why do you want to do this?
> >
> I had wanted to do similar things a while back before 10 other things beat
> me over the head and set me back.  It's funny because the above topology
> is exactly what I had envisioned but read that it was impossible.  My
> setup is to have a number of users who have bandwidth limiting based on an
> ip but also does priority shaping as well.  I finally decided that I could
> have a top level htb qdisc for the total box bandwidth with seperate
> classes for the users below the box bandwidth qdisc.  Underneath each
> user's class I thought that I could possibly attach a prio qdisc to do
> independent priority scheduling.  I don't know if this works.  It was just
> a thought I had.  If think the manpage shows that you can attach a prio
> to any class.  Does this work and is it a feasable setup?

Right now we have one htb qdisc at the root and a class under it for each
user. We could put a prio qdisc at the root and use htb under each of
prio's band classes. This gets ridiculously complex though as you get more
link levels. I'd really like to be able to priorize the packets at each
node though so that higher priority packets take precendence at each link
(not just at the main link).

Paul C. Diem
PCDiem@FoxValley.net

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