D-Link DES-3326SRM Product Manual - Page 77
Con QoS Output Scheduling
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D-Link DES-3326S Layer 3 Switch Configure QoS Output Scheduling Open the QoS Output Scheduling menu to adjust settings for the four QoS Classes. You may then change the Priority settings mapped to these Classes in the 802.1p User Priority setting menu (see below). Figure 10- 1. QoS Output Scheduling The MAX. Packets field specifies the number of packets that a queue will transmit before surrendering the transmit buffer to the next lower priority queue in a round-robin fashion. The default value of 0 combined with the default MAX. Latency value of 0 will enforce a strict scheduling for output queues. The maximum value for MAX. Packets is 255. The MAX. Latency field specifies the maximum amount of time-in multiples of 16 microseconds-that a queue will have to wait before being given access to the transmit buffer. The MAX. Latency is a priority queue timer. When it expires, it overrides the round-robin queuing and gives the priority queue that it was set for access to the transmit buffer. The default value of 0 combined with the default MAX. Packets value of 0 will enforce a strict scheduling for output queues. The maximum value for MAX. Latency is 255. Type in the values desired for scheduling and click on the Apply button to make the changes. NOTE: There is a small amount of additional latency introduced because the priority queue that is transmitting at the time the MAX. Latency time expires will finish transmitting its current packet before giving up the transmit buffer. 67