tc htb question

danfou · 12-26-2007, 08:26 AM

I'm using tc htb to shaper my traffic:

The total traffic is 400Mbit
Since I shape it 100Mbit, I can see 140Mbit of my traffic.
When I shape it to 200Mbit, I can see 270Mbit of my traffic.

Does anyone know why this is happening? How can I make it exactly certain rate?

tc qdisc add dev eth2 handle 1:0 root htb default 1
tc class add dev eth2 parent 1:0 classid 1:1 htb rate 100Mbit ceil 100Mbit
tc filter add dev eth2 parent 1:0 protocol ip u32 match ip protocol 47 0xff classid 1:1

Thanks

jlinkels · 12-26-2007, 08:10 PM

I am not completely sure (I studied a hundred examples and copied eventually one of them) but I thought you had to define a class first with speed settings, and below that class a qdisc. So to see, your qdisc has no parent class at all.

This is an excerpt from my own shaper:

Code:

$TC qdisc add dev $nic_ext root handle 1:0 htb default 90
        $TC class add dev $nic_ext parent 1:0 classid 1:1 htb rate 20mbit burst 15k

        #: Highest priority, full bw, higest CIR, 704/1024
        $TC class add dev $nic_ext parent 1:1 classid 1:10 htb rate 704kbit ceil 1700kbit
        $TC qdisc add dev $nic_ext parent 1:10 handle 10 sfq perturb 10
        $TC filter add dev $nic_ext parent 1:0 protocol ip prio 10 handle 10 fw classid 1:10

The first class I define (1:1) is for the entire network interface.

Then comes a first class (1:10 -> 704/1024) below this one, and below this class there is a qdisc.

The filter is obvious.

jlinkels

danfou · 12-26-2007, 09:10 PM

I tried the following commands, it still doesn't work. I mean it shape some traffic but the traffic is still far above 100Mbit

tc qdisc add dev eth4 handle 1:0 root htb default 1
tc class add dev eth4 parent 1:0 classid 1:1 htb rate 110Mbit ceil 110Mbit
tc class add dev eth4 parent 1:1 classid 1:10 htb rate 100Mbit ceil 100Mbit
tc qdisc add dev eth4 parent 1:10 handle 10 sfq perturb 10
tc filter add dev eth4 parent 1:0 protocol ip prio 1 u32 match ip protocol 47 0xff classid 1:10

In fact, I only have one class of traffic in eth4, So I also tried only the first two line, it is still far above 100Mbit

tc qdisc add dev eth4 handle 1:0 root htb default 1
tc class add dev eth4 parent 1:0 classid 1:1 htb rate 110Mbit ceil 110Mbit