[Freeswitch-dev] Using TC to prioritise VOIP traffic

[Tom Parrott]

Hi,

I have been experimenting with the tc command to prioritise VOIP 
traffic, and I wondered if anyone could check over my script and see if 
it does what I think it does :)

Effectively I want to create 3 queues, one for UDP traffic (RTP) with 
highest priority, one for SIP traffic (port 5060 TCP) with 2nd highest 
priority, and finally a 3rd queue for everything else.

#Put everything in 3rd queue by default?
tc qdisc add dev $DEV root handle 1: prio priomap 2 2 2 2 2 2 2 2 2 2 2 
2 2 2 2 2

#Create 3 SFQ queues
tc qdisc add dev $DEV parent 1:1 handle 10: sfq limit 3000
tc qdisc add dev $DEV parent 1:2 handle 20: sfq
tc qdisc add dev $DEV parent 1:3 handle 30: sfq

#Match UDP traffic and put into priority 1 queue
${TC} filter add dev $DEV parent 1: protocol ip prio 1 u32 \
         match ip protocol 17 0xff flowid 1:1

#Match SIP traffic and put into priority 2 queue
${TC} filter add dev $DEV parent 1: protocol ip prio 1 u32 \
         match ip dport 5060 0xffff flowid 1:2
${TC} filter add dev $DEV parent 1: protocol ip prio 1 u32 \
         match ip sport 5060 0xffff flowid 1:2

I have check the status of the queues, and it seems to be correctly 
classifying the different packets.

But I am not sure whether it is prioritising them correctly or not.

Thanks
Tom


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