Milan Technology MIL-SM2401MAF - Manual (Page 130)

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Switch Advanced setting interface
Priority Queue Service settings: select the priority queue service type.
First Come First Service: the sequence of packets sent is depend on arrive
order.
All High before Low: the high priority packets sent before low priority packets.
Weighted Round Ratio: select the preference given to packets in the switch's
high-priority queue. These options represent the number of high priority packets
sent before one low priority packet is sent. For example, 5 High: 1 Low means
that the switch sends 5 high priority packets before sending 1 low priority packet.
Qos Policy (checked for High Priority): 0~7 priority level can map to high or
low queue.