Pipeline performance - Example2

• Assume times for each functional unit of a pipeline to be: 10ns, 8ns, 10ns, 10ns and 7ns. Overhead 1ns per stage. Compute the speed of the data path.

• Pipelined: Stage time = MAX(10,8,10,10,10,7) + overhead

= 10 + 1 = 11ns.

This is the average instruction execution time at steady state.

• Non-pipelined: 10+8+10+10+7 = 45ns

• Speedup = 45/11= 4.1 times

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