Given data,
Non pipelined machine with 6 stages,
Length of each stage=20,10,30,25,40,15 ns.
Implementing the pipelining the machine adds each stage=5ns overhead.
Speed up factor of the pipelining system=?
Step-1: Non pipeline for 1 instruction to all stages=20+10+30+25+40+15 ns
=140 ns
Step-2: Per cycle adds 5ns overhead to each stage =25,15,35,30,45,20 ns
= 45 ns
Step-3: Speedup factor= Time non pipelining / Time with pipeline
= 140/45
= 3.11 ns