Polling for an I/O completion can waste a large number of CPU cycles if the processor iterates a busy-waiting loop many times before the I/O completes. But if the I/O device is ready for service, polling can be much more efficient than is catching and dispatching an interrupt. Describe a hybrid strategy that combines polling, sleeping and interrupts for I/O service. For each of these strategies (pure polling, pure interrupts, hybrid) describe a computing environment in which that strategy is more efficient than is either of the others.

Polling for an I/O completion can waste a large number of CPU cycles if the processor iterates a busy-waiting loop many times before the I/O completes. But if the I/O device is ready for service, polling can be much more efficient than is catching and dispatching an interrupt. Describe a hybrid strategy that combines polling, sleeping and interrupts for I/O service. For each of these strategies (pure polling, pure interrupts, hybrid) describe a computing environment in which that strategy is more efficient than is either of the others.

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Question

Polling for an I/O completion can waste a large number of CPU cycles if the processor iterates a
busy-waiting loop many times before the I/O completes. But if the I/O device is ready for service,
polling can be much more efficient than is catching and dispatching an interrupt. Describe a
hybrid strategy that combines polling, sleeping and interrupts for I/O service. For each of these
strategies (pure polling, pure interrupts, hybrid) describe a computing environment in which that
strategy is more efficient than is either of the others.

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When a CPU interrupt occurs, the processor comes to a halt and reacts to the signal. Why should the process be halted so that this duty may be completed? Let's start with the pausing procedure and then go on to the carrying out process. Explain?
Please and thank you. An external event is sensed using polling with period P. It takes 100 cycles to processthe event. Processor frequency is 48 MHz. Before starting a new period, the previouspolling 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.
A MISD machine is an example of a systolic array, a kind of array. Data processing units are organized into a "wavefront" in a systolic array. All of these components do not need the use of a program counter since execution is initiated when new data is received. Lock-step computation is achieved in a clocked-systolic array, where each unit completes its alternating calculation and communication phases in the same clock cycle.
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