Re: [Mldonkey-users] mldonkey and QoS

[Alexander Gretencord]

On Friday 06 September 2002 16:20, Rainer Krauss wrote:

> I'm really not an expert in CBQ and what i got so far as demonstrations
> doesn't change a lot to my router with mldonky traffic. Has
> anyone got some rules/classes for iptable/CBQ to optimize traffic with
> mldonkey use (just as a client, no server)? Or at least some tips
> where to start from? (I've DSL 1024/128 kbit - i'm using debian woody
> with 2.4.18 kernel if that matters)

It does :) I shape my mldonkey too but I use HTB which is not yet in the 
official kernel (will be in 2.4.20, is in since 2.4.10-presomething) but it 
works great and is easier to setup. And with HTB you can have one class 
borrow unused traffic from another class.

I've given mldonkey its own class which lives besides all the others. So my 
setup of classes is like this:

           1:1
      /      |      \
  1:10   ...   1:31

with 1:31 being mldonkey traffic. As you can see all traffic can borrow from 
the rest (if you can't read the user guide at 
http://luxik.cdi.cz/~devik/qos/htb/manual/userg.htm). mldonkey gets less if I 
have other traffic but can borrow unused traffic if it wants (up to a ceiling 
I defined). You can also read the Advanced Routing Howto at 
http://lartc.org/howto/ which is where I got more explanation of what the 
adsl-bw-howto just does :)

My script is an adaption of the script in the ADSL-Bandwidth-Management Howto. 
(I also use the RED queue for incoming traffic which works great but is not 
in the official kernel either).

This is what mldonkey gets

tc class add dev ppp0 parent 1:1 classid 1:31 htb rate 1kbps ceil 10kbps \
   burst 6k prio 3

This means mldonkey's rate is at 1kilobyte per second when my line is busy 
doing other uploading stuff but can get up to 10K/sec if my bandwidth is 
unused. The following attaches an sfq qdisc so mldonkey connections get 
stochastic fairness (each connection from mldonkey gets its fair share of 
that 1-10K/sec):

tc qdisc add dev ppp0 parent 1:31 handle 31: sfq perturb 10

To filter traffic into the right class I use iptables FWMARK support. The 
following matches on mark 5 set by iptables in my firewall:

tc filter add dev ppp0 parent 1:0 protocol ip prio 2 \
      handle 5 fw flowid 1:31

I set that mark for every packet that the mldonkey user creates. If you don't 
have an mldonkey user you can match on proccess name too but I'd suggest you 
make a user and run mldonkey under that user, its not just good for shaping. 
This is the line from my firewall script:

iptables -t mangle -A OUTPUT -j MARK -m owner --uid-owner mldonkey \
          --set-mark 5


Alex

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