Re: QoS for VoIP

Linux Advanced Routing and Traffic Control

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If you have for example 1024 Kbps, you have to create a class (maybe htb) 
about 920Kpbs to create the queue. Then you have to attach the prio qdisc to 
this class, mark the voip packets and send to class :1 in the prio qdisc.

Santiago
Ecuador
On Thu, 27 Sep 2007 12:05:16 -0400, Santiago wrote
> The prio qdisc is the solution. Try this.
> 
> On Thu, 27 Sep 2007 10:31:08 +0800, Ming-Ching Tiew wrote
> > As you are probably aware, this is a ever green topic.
> > 
> > I have personally tried doing it, testing it and verifying it
> > and I am myself finding this problem challenging and frustrating.
> > 
> > Most of the scripts will recommend some form of rate limiting
> > ( or policing ) on the download. But the challenge is how to 
> > determine the correct value for the policing ?
> > 
> > Lot of the recommendation says use x % over the sales package 
> > figure. Is this the correct way to do it ? Should it be a more
> > engineering way to empirically determine it ?
> > 
> > What I noticed is that if I over-specify the x %, then I
> > will greatly limit the utilizable bandwidth. The LAN users will
> > noticed significant difference in download speed compared
> > to when QoS is not running. But if I under specify the
> > x %, then the entire VoIP QoS has no significance, and
> > the VoIP quality will be bad.
> > 
> > Any views or comments ?
> > 
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