Pipeline and Vector Processing Q.34

34A device with data transfer rate 10 KB/sec is connected to a CPU. Data is transferred byte-wise. Let the interrupt overhead be 4 usec. The byte transfer time between the device interface register and CPU or memory is negligible. What is the minimum performance gain of operating the device under interrupt mode over operating under program controlled mode?

Option : B
Explanation : If overhead of a single byte transfer with interface mode is 4 ￫ sec, then actual data transfer can be 250000.
Actually transfer take place at the rate ￫ 10000
Now 25 is the minimum performance gain.

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