What is the benefit of having varied time-quantum sizes at various levels of a multilayer queueing system? Why is it vital for the scheduler to differentiate between I/O-bound and CPU-bound programmes?

Systems Architecture
7th Edition
ISBN:9781305080195
Author:Stephen D. Burd
Publisher:Stephen D. Burd
Chapter6: System Integration And Performance
Section: Chapter Questions
Problem 12RQ
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What is the benefit of having varied time-quantum sizes at various levels of a multilayer queueing system?
Why is it vital for the scheduler to differentiate between I/O-bound and CPU-bound programmes? 

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