Question

B. Ch. 5 Interrupt-driven I/O Assume that we have a hard disk that produces 220 interrupts per second when active, and assume that the disk is active 10% of the time. The overhead of interrupting the CPU and performing the transfer is 1000 clock cycles. What fraction of a 1 GHz CPU's time is spent attending to the hard disk drive?

Answer 1

Solution:-----------

When active , the hard - disk produces 2²⁰ = 1000K inturrupts per second.

10 % =0.1

1 GHz = 10⁹ Hz

SO,

0.1 * ( 1000K * 1000 ) / 10⁹ = 10%