Re: [LARTC] why so fast?

[Stef Coene <stef.coene@docum.org>]

On Wednesday 14 May 2003 11:25, sun reflex4 wrote:
> Hi,
> I am doing some test to control outgoing traffic, and  I want to see if
> everything is working, but when I configure Compuetr A, and make a download
> in Computer B from A (e.g.  in Computer A Apache is installed), the
> download goes so fast(not as in the ceil or rate!), even when I make the
> rate & ceil too small, am I doing something wrong??
> Example on Computer A:
>    tc qdisc add dev eth0 root handle 1: htb default 19
>
>   tc class add dev eth0 parent 1: classid 1:1 htb rate 10bps ceil 10bps
>   tc class add dev eth0 parent 1: classid 1:19 htb rate 15bps ceil 15bps
>
>   tc filter add dev eth0 parent 1: protocol ip handle 1 fw classid 1:1
>
>   iptables -t mangle -A OUTPUT -d 192.168.0.11 -j MARK --set-mark 1
> #Compter B has ip 192.168.0.11
Your setup is good, but you put all packets coming from computer A (and marked 
with 1) in class 1:1.  The problem is that this is not a leaf class because 
it has a child class.  And a non-leaf class can not transmit packets itself.  
So the packets are sended at link speed.
Solution : only leaf classes can shape traffic so make sure all packets ends 
up in a leaf class.  You can do this by removing the filter statement so all 
packets are placed in the default class.  Or change your filter statement so 
all packets marked with a 1 are redireted to class 1:19.

If you are interested, I did some tests myself.  You can find the results on 
www.docum.org.

Stef

-- 

stef.coene@docum.org
 "Using Linux as bandwidth manager"
     http://www.docum.org/
     #lartc @ irc.oftc.net

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