Re: [LARTC] Priority Queueing on Linux

[Patrick Chan <patrick_chan@mtelnet.com>]

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Hi,

Below is the explanation of priority queueing
http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/qos.htm#xtocid22

I am developing a linux router.
There is both data and voice traffic passed thru it.

When I use priority queueing on Cisco router,
the voice quality is good, evening downloading a large file.

But I use the following tc config, the voice quality is not smooth
when downloading a large file:

tc qdisc add dev ppp0 root handle 10: cbq bandwidth 112Kbit avpkt 1000
tc class add dev ppp0 parent 10:0 classid 10:100 cbq bandwidth 112Kbit rate
57Kb
it allot 1514 weight 5Kbit prio 2 maxburst 20 avpkt 1000 isolated
tc class add dev ppp0 parent 10:0 classid 10:200 cbq bandwidth 112Kbit rate
55Kb
it allot 1514 weight 5Kbit prio 8 maxburst 20 avpkt 1000 bounded
tc qdisc add dev ppp0 parent 10:100 sfq quantum 1514b perturb 15
tc qdisc add dev ppp0 parent 10:200 sfq quantum 1514b perturb 15
tc filter add dev ppp0 parent 10:0 protocol ip prio 2 u32 match ip tos 0x8
0xff
flowid 10:100
tc filter add dev ppp0 parent 10:0 protocol ip prio 8 u32 match ip tos 0x00
0xff
 flowid 10:200

voice packet is tagged with 0x8 in TOS field.
Voice traffic only uses 34K bandwidth. So the bandwidth allocated
to voice is enough.
Is there any better tc config?









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Date: Tue, 9 Jul 2002 11:46:58 +0200
From: bert hubert <ahu@ds9a.nl>
To: lartc@mailman.ds9a.nl
Subject: Re: [LARTC] Priority Queueing on Linux

On Tue, Jul 09, 2002 at 12:02:40PM +0800, Patrick Chan wrote:
> There is priority queueing in Cisco router.
> 
> Is there any equivalent implementation for TC on Linux?
> 
> If yes, how can I configure and can you give me example?

Please dig up a link so we can see what 'priority queueing' actually *is*.
But I bet that tc has it. 

Regards,

bert

-- 
http://www.PowerDNS.com          Versatile DNS Software & Services
http://www.tk                              the dot in .tk
http://lartc.org           Linux Advanced Routing & Traffic Control HOWTO

Date: Tue, 09 Jul 2002 09:19:11 -0400
From: "Michael T. Babcock" <mbabcock@fibrespeed.net>
Organization: FibreSpeed Ltd.
To: lartc <lartc@mailman.ds9a.nl>
Subject: Re: [LARTC] Priority Queueing on Linux

bert hubert wrote:

>On Tue, Jul 09, 2002 at 12:02:40PM +0800, Patrick Chan wrote:
>  
>
>>There is priority queueing in Cisco router.
>>    
>>
>Please dig up a link so we can see what 'priority queueing' actually *is*.
>But I bet that tc has it. 
>  
>
I can almost guarantee Patrick is asking about diffserv support.
-- 
Michael T. Babcock
CTO, FibreSpeed Ltd.



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