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From: bert hubert <ahu@ds9a.nl>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] tc hard problem
Date: Sat, 06 Jul 2002 12:10:31 +0000	[thread overview]
Message-ID: <marc-lartc-102595748205133@msgid-missing> (raw)
In-Reply-To: <marc-lartc-102592292622661@msgid-missing>

On Sat, Jul 06, 2002 at 10:45:12AM +0800, Patrick Chan wrote:
> Hi,
> 
> I have a Linux router which has to do QoS
> Voice and Data traffic will pass through this router
> Of cuz, voice traffic is put in first priority than data traffic
> Can you tell me how can I configure tc in order to meet 
> the following requirements?
> 
> 1. There are two types of traffic: voice and data
> 
> 2. The bandwidth to the Internet is just 64K
> 
> 3. Each voice call occupies 16K bandwidth, so 
> the whole bandwidth can only allows 4 concurrent voice calls
> 
> 4. The most important and most hard to do:
> If no voice call, data can use up to 64K bandwidth
> 
> If there are three voice calls, voice can use up to 16K x 3 = 48K bandwidth,
> data only can use 16K bandwidth
> 
> If there are four voice calls, voice can use up to 64K bandwidth,
> data cannot use any bandwidth
> 
> Voice always come first, data can only use the bandwidth left.

I've tried this and you can't get it perfect. The big thing with voice is
that it really hates delays. I think you'll be able to do 3 calls and have
data active at the same time. 

You can easily do this with the PRIO qdisc. Just make sure that all call
data, which you can recognize because they are small UDP packets most of the
time, and put them in the highest priority band, band 0 or 1 I think. Put
the rest in the lowest band.

I very much advise the use of 'tcng'
http://tcng.sourceforge.net/dist/tcng-8s.tar.gz

Configure with ./configure -n and read the example file. It should be pretty
easy to write something that does what you want. Also see
http://ds9a.nl/ols-presentation/800x600 , near the end.

Regards,

bert

-- 
http://www.PowerDNS.com          Versatile DNS Software & Services
http://www.tk                              the dot in .tk
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  reply	other threads:[~2002-07-06 12:10 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-07-06  2:45 [LARTC] tc hard problem Patrick Chan
2002-07-06 12:10 ` bert hubert [this message]
2002-07-06 14:08 ` bert hubert
2002-07-08  3:17 ` Patrick Chan

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