Patterson Hennessey

Question

Which of the following cache designer guidelines are generally valid?
1.  The shorter the memory latency, the smaller the cache block
2.  The shorter the memory latency, the larger the cache block
3.  The higher the memory bandwidth, the smaller the cache block
4.  The higher the memory bandwidth, the larger the cache block

Answer 1

I can't find the relation between memory latency and cache size, But one thing is for sure that if memory bandwidth is high the cache size should be large to accommodate. Even in the Patterson (page 471 ) you can see discussion about this bandwidth and cache block size.

According to me 4th one is the right answer.

Comments

I think 1st option is correct.

Answer 2

1 and 4.

Smaller block size mean less time to load and access, larger block obviosly take more time than smaller.

4 as exactly the vaibhav said higher bandwidth means larrge cache size