To avoid the two memory reads on every access, the 386 includes a 32-entry Translation Lookaside Buffer (TLB) organized as 8 sets with 4 ways each. Each entry stores the virtual-to-physical mapping along with the combined PDE+PTE permission bits.
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事实已经证明了这一点。春节期间，因为新机价格普遍上涨，把不少消费者推向了那些芯片稍老一代、但内存配置同样不低的老产品。一位手机专卖店老板指着柜台里的样机表示，“现在不少年轻人进来就问，有没有前两年的旗舰款”。