Re: [LARTC] CBQ Rate

From: Stef Coene <stef.coene@docum.org>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] CBQ Rate
Date: Thu, 04 Sep 2003 17:49:41 +0000	[thread overview]
Message-ID: <marc-lartc-106269785907476@msgid-missing> (raw)
In-Reply-To: <marc-lartc-106269010029191@msgid-missing>

On Thursday 04 September 2003 19:07, Emmanuel SIMON wrote:
> It is me again.
> is there nos a trouble in my script :
> " ... rate 5Mbit weight 0.3 ..." --> is it compatible ??
Yes.  But take weight = rate / 10 as a general rule.
And your bandwidth parameter should be the real NIC bandwidth.  So 10mbit.
And it's also better to create a "parent" class attached to the root qdisc.
And different prio's in the filter statement will not change much.  It only 
determines the order the filters are checked.

> Thanks again
>
> > -----Message d'origine-----
> > De : lartc-admin@mailman.ds9a.nl
> > [mailto:lartc-admin@mailman.ds9a.nl]De
> > la part de Emmanuel SIMON
> > Envoyé : jeudi 4 septembre 2003 17:40
> > À : 'LARTC'
> > Objet : [LARTC] CBQ Rate
> >
> >
> > Hi everyone,
> >
> > This is on a linux box, ingress (eth1) at 100Mb/s and egress (eth0) at
> > 10Mb/s. The purpose is to test CBQ
> > Here is my script
> >
> > -------------------------------------------------------------------
> > # Root qdisc
> > tc qdisc add dev eth0 root handle 1:0 cbq bandwidth 9Mbit \
> >   avpkt 1000 cell 8
> >
> > # Classes
> > tc class add dev eth0 parent 1:0 classid 1:1 cbq bandwidth 9Mbit \
> >   rate 5Mbit weight 0.3 allot 1514 avpkt 1000 bounded prio 1
> > tc class add dev eth0 parent 1:0 classid 1:2 cbq bandwidth 9Mbit \
> >   rate 5Mbit weight 0.3 allot 1514 avpkt 1000 bounded prio 2
> > tc class add dev eth0 parent 1:0 classid 1:3 cbq bandwidth 9Mbit \
> >   rate 5Mbit weight 0.3 allot 1514 avpkt 1000 bounded prio 3
> >
> > # Leaf qdiscs
> > tc qdisc add dev eth0 parent 1:1 handle 10:0 sfq perturb 10
> > tc qdisc add dev eth0 parent 1:2 handle 20:0 sfq perturb 10
> > tc qdisc add dev eth0 parent 1:3 handle 30:0 sfq perturb 10
> >
> > # Filters
> > tc filter add dev eth0 parent 1:0 proto ip prio 0 u32 \
> >   match ip tos 0x10 0xff flowid 1:1
> > tc filter add dev eth0 parent 1:0 proto ip prio 1 u32 \
> >   match ip tos 0x04 0xff flowid 1:2
> > tc filter add dev eth0 parent 1:0 proto ip prio 2 u32 \
> >   match ip tos 0x08 0xff flowid 1:3
> > -------------------------------------------------------------------
> >
> > I send some traffic at different rate : 3Mb/s, 3.5Mb/s,
> > 4Mb/s, 4.5Mb/s,
> > 5Mb/s, 6Mb/s
> >
> > 1st in only one class at a time
> >    => the result is always 2.35Mb/s
> >
> > then in the 3 classes at the same time with the same rates.
> >    => the result rate is close from wanted rate
> >
> > Can someone explain to me why we I send data in only one
> > class the rate is
> > so low ?
> >
> > Thank you
> > Emmanuel

Stef

-- 

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

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