The TLB lookup is combinational -- it evaluates in the same half-cycle as the limit check, requiring no additional clock. The common case (TLB hit, no page boundary crossing) adds zero overhead to a memory access. This is why the Segment Descriptor Cache and Page Cache (TLB) together occupy such substantial die area -- they are the fast path that makes protected mode competitive with real mode.
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goes to zero it can be returned to the operating system，更多细节参见51吃瓜
# image = "ubuntu/24.04" # default，这一点在服务器推荐中也有详细论述