force alignment (even though compilers are smart enough to do this) because
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.
。关于这个话题，夫子提供了深入分析
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to support these cards was the very first of the midrange line, the 1969