Final answer:
Most virtual memory schemes utilize a Translation Lookaside Buffer (TLB) to overcome the problem of doubling memory access time.
Step-by-step explanation:
In order to overcome the problem of doubling the memory access time, most virtual memory schemes utilize a special high-speed cache for page table entries, also known as a Translation Lookaside Buffer (TLB). The TLB is a hardware cache that stores recently accessed virtual-to-physical address translations, reducing the time needed to access a page table entry.
When a virtual memory system receives a memory access request, it first checks the TLB. If the desired virtual-to-physical address translation is found in the TLB, the memory access can be completed quickly. If not, the virtual memory system retrieves the necessary page table entry from main memory, updates the TLB with the translation, and then performs the memory access.
The TLB operates on the principle of locality; it takes advantage of the fact that programs tend to access memory locations that are close to each other. By caching frequently accessed translations, the TLB greatly reduces the memory access time and improves overall system performance.
TLB is a special high-speed cache for page table entries that stores recently accessed virtual-to-physical address translations. It reduces memory access time and improves system performance.