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by Dylan16807
921 days ago
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> They both involve flushing cache to backing stores, and waiting for confirmation of the write. No they don't. A fence only imposes ordering. It's instant. It can increase the chance of a stall when it forbids certain optimizations, but it won't cause a stall by itself. CLWB is a small flush, but as tanelpoder explained the more recent CPUs did not need CLWB. |
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