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

H. Peter Anvin
2007-10-16T00:15:42Z

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