| SP (Strict priority)
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SP handles the scheduling of the packets following a priority-based model where packets are classified and placed into different queues with different priorities. Packets are sent from the head of a given queue for processing only if the queues with higher priorities are empty.
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| WRR (Weighted round robin)
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WRR addresses the priority queue problem in which one queue can starve other queues that are not as high a priority. WRR does this by allowing at least one packet to be removed from each queue containing packets in each scheduling turn. This scheme is best used with server queues with different processing capacities.
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| WFQ (Weighted fair queueing)
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In WFQ big packets do not get more scheduling time than smaller packets, as the WFQ foci is on bits and not packets as in WRR.
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| DWRR (Deficit weighted round robin)
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DWRR is a modified WRR scheduling type that addresses the limitations of WRR. The algorithm handles packets with variable sizes. A maximum packet size number is subtracted from the packet length, and packets that exceed that number are held back until the next scheduling turn
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| Mixed SP and WFQ
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With this type of scheduling the top scheduler inputs are SP and the bottom scheduler inputs are WFQ . Usually it is the top three are SP and the bottom five are WFQ.
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