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Consider a 2 level memory hierarchy. L1 (cache) has an accessing time of 15 ns and main memory has an accessing time of 20 ns. Writing or updating contents into their memory takes 30 ns for L1 and 25ns for main memory respectively. Assume L1 gives misses 75% of the time and percentage of dirty bits = 35%

The average WRITING time for system (in ns) if it uses WRITE-BACK technique for hierarchical access is ______.

The average READING time for system (in ns) if it uses WRITE-BACK technique for hierarchical access is ______.

The average WRITING time for system (in ns) if it uses WRITE-BACK technique for simultaneous access is ______.

The average READING time for system (in ns) if it uses WRITE-BACK technique for simultaneous access is ______.

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Shubhanshu asked Aug 5, 2017
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According to my calculation, the time required in write back is 240ns and for write through it should be 1920ns. Is it correct or not?