Ericsson MINI-LINK PT 2010 ETSI Technical Description page 25

Figure 10
With Strict Priority, buffers with lower priority will never get served if high priority
queues are constantly being filled up. The scheduler will serve the high priority
Strict Priority area first and empty the buffers according to the Strict Priority
algorithm. The low priority Strict Priority buffers are emptied when all buffers
above are empty.
The WFQ algorithm is used when low latency is not crucial, but it is important
to prevent starvation of buffers. With Strict Priority, buffers with lower priority
will never get served if high priority queues are constantly being filled up. WFQ
however will make sure that all queues are served according to the predefined
weight (%). The accuracy of the percentage allocation is roughly 1%, where
constant bit rate traffic is more accurate than burst traffic. WFQ is typically used
for buffers with non delay sensitive data traffic.
Figure 11
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Highest priority (TC7)
Egress priority/TC
buffers
Lowest priority (TC0)
Strict Priority Based Scheduling
Highest priority (TC7)
Lowest priority (TC0)
Weighted Fair Queuing Scheduling
MINI-LINK PT 2010 Functions – Ethernet
Empty 1st
Empty2nd
Strict
Priority
Scheduler
Empty last
Serve 10%
Serve 20%
Serve x%
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