[LARTC] why isn't 1:1 getting the traffic? [filter question]

[Andreas]

Jody Shumaker wrote:
>>tc qdisc del dev eth0 root > /dev/null 2>&1
>>tc qdisc add dev eth0 handle 1: root htb default 2
>>tc class add dev eth0 classid 1:1 parent 1: htb rate 100kbps ceil 100kbps quantum 1500
>>tc class add dev eth0 classid 1:2 parent 1: htb rate 90mbit ceil 90mbit quantum 1500
> 
> 
> You're defining 2 root classes to the HTB qdisc, while it should
> possibly have given an error, it seems to instead just put the first
> one, 1:1, into a state of limbo where its never used.
> 
> This was fairly obvious looking at your tc statistics output, where it
> lists both 1:1 and 1:2 as roots with no parent. There can only be one
> valid root class.

Why? I need two virtual circuits. I don't want the 90mbit class 
interfere with the 200kbit class: no lending, no borrowing.

> Should really set it up something like this with one main root:
> tc qdisc add dev eth0 handle 1: root htb default 2
> tc class add dev eth0 classid 1:0 parent 1: htb rate 90100kbps ceil
> 90100kbps quantum 1500
> tc class add dev eth0 classid 1:1 parent 1:0 htb rate 100kbps ceil
> 100kbps quantum 1500
> tc class add dev eth0 classid 1:2 parent 1:0 htb rate 90mbit ceil
> 90mbit quantum 1500
> 
> Then I imagine your tc filter would actually work.

It actually works if I use a *leaf* class as the target of the filter 
(see my subsequent email). But this contradicts the documentation, which 
even mentions one could gain speed by adding further filters to other 
classes besides a root one.