Polling for an I/O completion can waste a large number of CPU cyclesif the processor
Chapter 13, Problem 13.4(choose chapter or problem)
Polling for an I/O completion can waste a large number of CPU cyclesif the processor iterates a busy-waiting loop many times before the I/Ocompletes. But if the I/O device is ready for service, polling can be muchmore efficient than is catching and dispatching an interrupt. Describea hybrid strategy that combines polling, sleeping, and interrupts forI/O device service. For each of these three strategies (pure polling, pureinterrupts, hybrid), describe a computing environment in which thatstrategy is more efficient than is either of the others.
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