bandwidth management,htb, r2q?? quantum??
I am working on a Bandwidth management project for my company.I am running TCNG 10-b but I am not able to classify packets based on MAC address using tcng, so I am running tc commands in /tcng/bin and they are working. But is there a way out to classify packets based on MAC address using TCNG.
And, I am successful in throttling down the Bandwidth to 8kbit using HTB. Below that I get report to change r2q. I want to bring down the Leaf class Bandwidth to 3kbit.My script is as below:
Tc Script to throttle down the Bandwidth to 8kbit based on MAC address and IP address
tc qdisc del dev eth0 root
tc qdisc add dev eth0 root handle 1:0 htb default 30 r2q 1
tc class add dev eth0 parent 1:0 classid 1:1 htb rate 24kbit ceil 24kbit quantum 1514
tc class add dev eth0 parent 1:1 classid 1:10 htb rate 8kbit ceil 8kbit
tc qdisc add dev eth0 parent 1:10 handle 10:0 sfq
tc class add dev eth0 parent 1:1 classid 1:20 htb rate 8kbit ceil 8kbit
tc qdisc add dev eth0 parent 1:20 handle 20:0 sfq
tc class add dev eth0 parent 1:1 classid 1:30 htb rate 8kbit ceil 8kbit
tc qdisc add dev eth0 parent 1:30 handle 30:0 sfq
tc filter add dev eth0 parent 1:0 protocol ip prio 1 u32 match ip dst 192.168.10.163 flowid 1:10
tc filter add dev eth0 parent 1:0 protocol ip prio 1 u32
match u32 0x11e6bd53 0xffffffff at -12
match u16 0x0011 0xffff at -14 flowid 1:20
If I am to Throttle down the Leaf class Bandwidth to 3kbit what should be the value of root qdisc r2q?? and what should be the value of root class quantum??
Normaly you don't need to specify quantums manualy as HTB chooses precomputed values. It computes classe's quantum (when you add or change it) as its rate divided by r2q global parameter. Its default value is 10 and because typical MTU is 1500 the default is good for rates from 15 kBps (120 kbit). For smaller minimal rates specify r2q 1 when creating qdisc - it is good from 12 kbit which should be enough. If you will need you can specify quantum manualy when adding or changing the class. You can avoid warnings in log if precomputed value would be bad. When you specify quantum on command line the r2q is ignored for that class.
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