Hi John,
Here is my source of reference for this response
End to End QoS Design- Quality of Service for Rich-Media & Cloud Networks
Here is the extract from above reference, which I hope useful to you.
- Hardware allocation of buffers is provided only to the priority queues on both wired & wireless queues of this platform.
- The other queues are allocated bufferes on as-needed basis, making it more flexible within the system to support several queues at once.
- Each queue (class) can leverage additional buffering capacity from the shared buffer pool based on a "queue-buffer ratio x" command.
- This command sets the ratio of buffers received by the class and these are allocated on an as-needed basis
- In general the max rate for the class is upto four times the configured value, the queue-buffer ratio command skew this value based on the overall ratio provided to the queue.
- By default these use 1:1:1... for a wired port & 10:20:50:20 for a wireless port on this platform.
- The recommended buffer allocation for wired interface queue 7 to 1 are 10:10:10:10:10:10:25 in percentage (%). Wireless port should use the default values.
- 3850 does not provide reserve thresholds and maximum(overload) thresholds are based on the queue buffer's ratio for non priority queues.
This post may also help you on this
http://mrncciew.com/2013/12/23/3850-qos-part-2-queuing-models/
HTH
Rasika
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