Re: [LARTC] how hierarchical is HTB?

[Claudio Greco <cla.greco@fastwebnet.it>]

> root class 1: (rate\x100, ceil\x100)
> 1: children classes 1:10 (30,100) and 1:20 (70,100)
> 1:10 children classes 1:100 (10,100) and 1:101 (20,100)
> 1:20 children classes 1:200 (30,100) and 1:201 (70,100)
>
> I managed to have the root rate equals to the sum of its children. 
>
>   
Well, it is still true that total assured rate for classes 1:200 and 
1:201 is greater than assured rate for class 1:20. Still, I don't think 
this is a big deal.

> But how must the rates of the leaves be signed?
>   
What do you mean with 'signed'?

> And how the bandwidth of these leaves will be distributed when
> borrowing/lending is necessary? 
>
>   
As far as I know, when a leaf is 'yellow', i.e. its rate is greater than 
its assured rate and lesser than its ceil rate, it can borrow from its 
parent providing there's a yellow-path to the root and the root is green 
(root can't be yellow, only green or red).

If there's more than one child borrowing from the same class, they're 
served according to their priority (argument prio in *tc class add*).

If there's more than one child having the same priority, then they're 
served in DRR order (Deficit Round Robin).

You can tune DRR behaviour with arguments r2q in *tc qdisc add* and 
quantum in *tc class add*.

> classs 1:10 will/may lend/borrow from class 1:20. I know that.
>   
No it can not. A class can only borrow from its parent, never from its 
siblings.

> But how about 1:1XX and classes 1:2XX? will the borrow/lend from each
> others?
>
>   
ibidem.

> Any docs about this?
>
>   
You may see:

http://luxik.cdi.cz/~devik/qos/htb/manual/userg.htm
http://luxik.cdi.cz/~devik/qos/htb/manual/theory.htm

_______________________________________________
LARTC mailing list
LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc