Re: LFENCE instruction (was: [rfc][patch 3/3] x86: optimise barriers)

[H. Peter Anvin]

Mikulas Patocka wrote:
> I know about unordered stores (movnti & similar) --- they basically use 
> write-combining method on memory that is normally write-back --- and they 
> need sfence. But which one instruction does unordered load and needs 
> lefence?

PREFETCHNTA.

	-hpa
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