Given scenario:
The given performance parameters of virtual machine is as follows:
- Base CPI =1.5
- Privileged O/S accesses per 10000 instructions = 120
- Performance impact to guest O/S= 15 cycles
- Performance impact to VMM = 175 cycles
- I/O Access per 10000 instructions = 30
- I/O access time = 1100 cycles
![Check Mark](/static/check-mark.png)
Explanation of Solution
Calculation of CPI:
Calculation of CPI if the VMM performance impact double:
Calculation of CPI if the VMM performance cut in half:
Longest possible penalty to trap to the VMM:
To obtain a 10% performance degradation, use the following formula:
Therefore, 13 cycles is the longest possible penalty to trap to the VMM.
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Chapter 5 Solutions
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