CBWFQ and Priority Q Scheduling with IOS

Question

All,
I have a question in regards to scheduling in QoS.
I have below 2 priority queues (both pri quese go into one queue we beleive), and 3 CBWFQs.
The qestion is, how are these queus scheduled. I know that priority Qs will be emtied before moving onto the CBWFQ.
On the CBWFQ side, how are these scheduled, in a round-robin way? or is the amount of time they get serviced increased, the bigger the bandwidth statement is configured (Like custom-queuing and bigger queue configured in terms of bytes equates to more time being scheduled to empty the queue before moving onto the next queue)
policy-map carrier_cos
class carrier_EF
priority
police 1605000 8000 8000 conform-action transmit exceed-action drop
class carrier_AF4
priority
police 1530000 71500 71500 conform-action transmit exceed-action drop
class carrier_AF1
bandwidth 6120
class carrier_bulk
bandwidth 5480
class class-default
bandwidth 15265
Sounds to me like CBQFQ is a mixture of priority-queueing and custom-queuing combined.
Many kind regards for you help with this question.
Ken

Answer 1

Thx for that.
So, if I have a 1M/bit cct and have CBWFQ running.
CBWFQ 1 = Bandwdith 600
CBWFQ 2 = Bandwdith 200
CBWFQ 3 = Bandwdith 200 (class class-default)
assume interface is congested. How does the scheduler work?
Is it, within a time period, (let say 1second) it will spend 600ms servicing Q1, then move onto Q2 and spend 200ms on that queue before moving onto Q3 where it will spend a 200MS servicing that Queue and then go back to Q1?
Correct me if Im wrong, but is that the same as Custom Qeueing?
1 Second is a long time so what timer interval is used.
Remember is a 1M/bps circuit.
Kindest regards, and many thx.
Ken