Traffic shaping with rtorrent

Hi,

I have been trying to shape the traffic out from my Linux router. I run rtorrent on the router machine.

I have been marking all the packaged sent from rtorrent with iptables (ports + conmark), iptables together with both l7-filter or ipp2p.
The marking seems to work as expected. All packaged seems to get marked.

Then when the packages are marked, I have some tc commands putting the packages in queues and prioritizing the traffic in different ways.
Here comes some problems that I have not been able to solve.
I want to prioritize all other upload traffic from me over bittorrent traffic. Traffic generated by rtorrent should have the lowest priority.
If my upload is not used for anything, rtorrent should be able to use it all. But if someone else wants to use the upload, the rtorrent traffic should let it do so.

I have managed to do this with dc++ and some other types of traffic. With rtorrent it does not go so well.
I am quite sure that it has to do with rtorrent opening up so many connections. I found this that supports my theory:

"Unfortunately, some clever software (e.g. Kazaa and eMule among others)
obliterate the benefit of this attempt at fair queuing by opening as
many TCP sessions (flows) as can be sustained. In many networks, with
well-behaved users, SFQ can adequately distribute the network resources
to the contending flows, but other measures may be called for when
obnoxious applications have invaded the network." From here: http://www.linux.com/howtos/Traffic-Control-HOWTO/classless-qdiscs.shtml

Changing "max_open_sockets" to something low like 6 or 8 makes the traffic shaping work. But this makes the downloads very slow, and usually the uploads are too slow even though the upload pipe is not used by any other process.

Has anyone managed to shape the traffic in a situation like this?

Maybe there could be some setting implemented that could make rtorrent less aggressive?

Any help is greatly appreciated.
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