A computer has a bus with a 5-nsec cycle time, during which it can read or write a 32-bit word from memory. The computer has an Ultra4-SCSI disk that uses the bus and runs at 160 Mbytes/sec. The CPU normally fetches and executes one 32-bit instruction ever 1 nsec. How much does the disk slow down the CPU?
The machine normally operates at 1/(1*10^-9)= 1000 MIPS. But the data coming from the disk needs to be placed in memory, and uses the bus. 160Mb/sec implies a rate of ...
The solution gives detailed steps on finding the amount that the disk slow down the CPU.