Some TLBs support address space identifiers (ASIDS), why?

Answer:

-Multitasking operating systems would better perform when the physical memory addresses loaded from the TLB are identifiable, as they are process specific. On a context switch, one needs to flush the TLB (invalidate all entries), which is an expensive operation, and on a system that is frequently context switching could provide so much of a performance issue that the TLB almost becomes useless.

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