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Unformatted text preview: completes. But if the I/O device is ready for service, polling can be much more efFcient than is catching and dispatching an interrupt. Describe a hybrid strategy that combines polling, sleeping, and interrupts for I/O device service. ±or each of these three strategies (pure polling, pure interrupts, hybrid), describe a computing environment in which that strategy is more efFcient than is either of the others. 13.5 How does DMA increase system concurrency? How does it complicate hardware design? 13.6 Why is it important to scale up system bus and device speeds as the CPU speed increases? 13.7 Distinguish between a STREAMS driver and a STREAMS module. 29...
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This note was uploaded on 11/03/2009 for the course IT OS taught by Professor Dr.stephan during the Winter '09 term at Abu Dhabi University.
- Winter '09
- Operating Systems