altq on $if_ppp hfsc bandwidth 170Kb queue { std, ssh, http, ack}
queue std bandwidth 25% priority 0 hfsc (default realtime 32Kb upperlimit 170Kb)
queue ssh bandwidth 25% priority 5 hfsc (realtime 64Kb upperlimit 160Kb )
queue http bandwidth 25% priority 2 hfsc (realtime 32Kb upperlimit 160Kb )
queue ack bandwidth 25% priority 7 hfsc ( realtime 8Kb upperlimit 160Kb)

pass out on $if_ppp proto tcp from any queue (std, ack)
pass out on $if_ppp proto tcp from any to port 22 queue (ssh, ack)
pass out on $if_ppp proto tcp from any to port {80,443} queue (http,ack)