Deciding what entries to keep in the TLB is crucial to the efficient operation of a virtual memory system. The percentage of references that get “resolved” via the TLB is called the TLB hit ratio. Compare and contrast the performance of virtual address translation systems that achieve a high (near 100 percent) hit ratio versus those that achieve a low (near 0 percent) hit ratio.
What will be an ideal response?
Obviously, systems with a high hit ratio perform their address translations much faster
than those with a low hit ratio. The difference could be extraordinary. Translations through
direct-mapped primary memory require an extra memory cycle. Thus a poor hit ratio could
conceivably “bring the system to its knees.”
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