Atomicity: Updates are applied in a single operation at reboot, reducing the risk of inconsistency.
Not Equal: Every domino half in this space must have a completely different number of pips.
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Base image: Intel 80386 DX die, Wikimedia Commons
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Three microcode cycles for the writeback alone. That's acceptable because segment loads are already expensive multi-cycle operations, and the designers likely expected them to be infrequent -- most programs load their segments once at startup and never touch them again. Page translations happen on every memory access, so the same approach would be ruinous. Hence the fully autonomous hardware walker.