ALTQ example (cont.) solution: priorize empty TCP ACKs altq on kue0 priq bandwidth 100Kb queue { q_def, q_pri } queue q_def priority 1 priq(default) queue q_pri priority 7 pass out on kue0 proto tcp flags S/SA \ keep state queue (q_def, q_pri) pass in on kue0 proto tcp to port www flags S/SA \ keep state queue (q_def, q_pri) result: download drops from 50 kB/s to 48 kB/s (instead of 7 kB/s) when uplink gets saturated