Assume a hierarchical memory system having a joint instruction/data cache with a memory - access cost of 10 ns on a hit and 90 ns on a miss. an alternative design without hierarchical memory architecture has a memory - access cost of 70 ns. what is the minimum cache - hit percentage that would make the hierarchical memory system useful?

solution:

this situation is called an ip conflict.

data from a server is sent in small bits called packets. in an ip conflict, some packets will end up in one computer while some other packets will end up in another computer.

so…overall none of the computers get the data as the original message or picture being sent by the server cannot be retrieved with only half the packets. so it will show up as an error.

thus the final answer is d.

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