One of routers have about 120 active users the same time. Bandwith is about 11Mbit/s. All working fine!
Second routers have about 200 active users the same time. Bandwith is about 20Mbit/s. Packet loss ~1-2%!
Third router have about 330 active users the same time. Bandwith is about 29Mbit/s. Packet loss is about 8%. CPU load on every router is not more than 45%. Where is the problem???
With old configuration (every user have one queue) all working fine! Packet loss not more than 1/1000