Re: [LARTC] Problem attaching htb class to a htb qdisc

[Andy Furniss <lists@andyfurniss.entadsl.com>]

Ruben Porras wrote:
> I'm trying to build a QoS system that would divide the outgoing traffic
> into four categories, each one also subdivided into two more categories.
> For that I chose a htb root qdisc subdivided into four classes, each of
> these classes contains also a htb qdisc. Until these point everything
> goes well, but when I try to attach a new class to the leaf htb qdisc a
> problem with the sintaxis arises. Code follows:
>         
>         
>         tc qdisc add dev $DEV root handle 1: htb default 30
Remember if $DEV is eth arp will go here.
>         
>         tc class add dev $DEV parent 1: classid 1:1 htb rate
>         ${UPLINK}kbit
>         
>         tc class add dev $DEV parent 1:1 classid 1:10 htb rate
>         ${UPLINK}kbit
>         tc class add dev $DEV parent 1:1 classid 1:20 htb rate
>         ${UPLINK}kbit
>         tc class add dev $DEV parent 1:1 classid 1:30 htb rate
>         ${UPLINK}kbit
>         tc class add dev $DEV parent 1:1 classid 1:40 htb rate
>         ${UPLINK}kbit
If you want UPLNK to be the max then children need UPLINK/4 - the parent 
will not cap it. Use ceil UPLINK aswell if you want each to be able to 
reach max when other classes are empty.
>         
>         tc qdisc add dev $DEV parent 1:10 handle 10: htb default 12
This is strange, not sure if it's what you want - you don't need another 
htb here, though it is possible it's not normal. If you just want a 
child under 1:10 then do as you do below with parent 1:10, but remember 
parents don't cap rate of children.
>         tc class add dev $DEV parent 10: classid 1:11 htb rate
>         ${UPLINK}kbit
>         prio 1

If you really want htb under htb then classid 10:11 may work.

Andy.


>         
>         RTNETLINK answers: Invalid argument
>         
>         tc class add dev $DEV parent 10: classid 1:12 htb rate
>         ${UPLINK}kbit
>         prio 2
>         
>         RTNETLINK answers: Invalid argument
>         
>         tc qdisc add dev $DEV parent 1:11 handle 11: sfq perturb 10
>         tc qdisc add dev $DEV parent 1:12 handle 12: sfq perturb 10
>         
>         ...
>         
> If I attach the classes to 1: instead of 10: everything goes well, but I
> do not understand why I can't attach a class to 10:
>         
> Any help would be appreciated.
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