3. An external event is sensed using polling with period P. It takes 100 cycles to process the event. Processor frequency is 48 MHz. Before starting a new period, the previous polling task should have finished. The relative deadline for processing an event is 10μs. (a) Determine the range of feasible polling periods? (b) Suppose now that an unrelated interrupt may occur and the interrupt has higher priority than the code for processing the polling event. Including all overhead, it takes 40 cycles to process the interrupt. The minimum time between two subsequent interrupts is T. Suppose that T is larger than 140 cycles. Determine the range of feasible polling periods.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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3. An external event is sensed using polling with period P. It takes 100 cycles to process
the event. Processor frequency is 48 MHz. Before starting a new period, the previous
polling task should have finished. The relative deadline for processing an event is 10μs.
(a) Determine the range of feasible polling periods?
(b) Suppose now that an unrelated interrupt may occur and the interrupt has higher
priority than the code for processing the polling event. Including all overhead, it takes 40
cycles to process the interrupt. The minimum time between two subsequent interrupts is
T. Suppose that T is larger than 140 cycles. Determine the range of feasible polling
periods.
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