An I/O system using DMA has a latency time of 10 ms between the peripheral requesting a data transfer and the transfer beginning. This system transfers data at the rate of one byte per microsecond. What is the peak efficiency of this arrangement if:
a. data is transmitted in 1 KB blocks?
b. data is transmitted in 10 KB blocks?
a. efficiency = data transfer time/(data transfer time + latency) = 1,024 × 1/(1,024 × 1 + 10 × 1,000) = 1,024/(1,024 + 10,000) = 0.0929 = 9.29%.
b. efficiency = 10 × 1,024 × (10 × 1,024 + 10,000) = 0.5059 = 50.59%
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