[Cake] diffserv based on firewall mark

[ching lu]

My current config is HTB+fq-codel.

I deprioritize bittorrent traffic by marking related connections in
iptables (e.g. detect by port number) and route them to corresponding
HTB class and qdisc.

How can i archive the same goal using the cake qdisc?

I am aware that cake supports Diffserv by DSCP, but i think it is not applicable

1. i do not know to turn on DSCP for Winodws 8 (or above) client  <-
someone may know
2. ingress traffic do not have DSCP


Thanks in advance