dev="eth0"

tc qdisc del dev $dev root
iptables -t mangle -v -D OUTPUT 1
tc qdisc add dev $dev root handle 1: htb
tc class add dev $dev parent 1: classid 1:10 htb rate 56kbit ceil 56kbit
tc filter add dev $dev parent 1: prio 0 protocol ip handle 10 fw flowid 1:10
iptables -t mangle -A OUTPUT -p tcp -m owner --uid-owner www-data -j MARK --set-mark 10