(Choose 1 answer)
Imagine that a certain modem can read 7,000 characters per second and that the time to read a character to the modem register is so short it can be ignored. If to run this modem using interrupt-driven I/O and each character read requires an interrupt that takes 10 usec all-in to service. How many percent of the CPU does the interrupt overhead cost?
A. 4% of the CPU
B. 93% of the CPU
C. 7% of the CPU
D. 96% of the CPU
Exit 22
