cache miss question

Question

 

In $T_{Read Avg}$, shouldn’t it be $T_{Read Avg}$ = (10*0.9) + 0.1*(10+100), because it must be checking the cache in case of cache miss too, right?

Comments

In hierarchical access, you have to first put the data to cache for which extra 0.1*(100+10) here 10 unit time extra needed .

But in simultaneous we directly read from main memory so we don't need to take the data from main memory to cache but simultaneously search in both cache in main memory. So no need of extra 10 unit time in 0.1*(100+10) .

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Yes, by default it is heirarchical for cache as used in standard text books.

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thanks