"It was very painful, it felt like you've been hit by a bus," she said. "Nothing would prepare you to understand how much pain I was in."
Virtual memory is conceptually simple but potentially devastating to performance. Every memory access must go through segmentation (add segment base, check limit) and then paging (look up the page table). Naively, paging alone requires two additional memory reads per access -- one for the page directory entry, one for the page table entry.
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