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Kapittel 11 · I/O-enheter, disker og RAIDI/O devices

Polling vs Interrupts: How the CPU Talks to a Slow Disk

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Polling vs interrupts — polling spins the CPU on a device status register until the device is ready; an interrupt lets the CPU run other work and be woken when the device is done. For a slow device the difference is most of the CPU's time.

pollinginterruptI/O devicedevice driverCPU utilisationbusy-wait
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