Re: [PATCH] X86: MM: Add PAT Type write-through in combination with mtrr

Ingo Molnar
2013-10-28T10:31:36Z

* Borislav Petkov <bp@alien8.de> wrote:

> On Mon, Oct 28, 2013 at 11:17:49AM +0100, Ingo Molnar wrote:
>
> > And regular write-back cacheable isn't sufficient because the
> > CPU could do things like prefetch your range automatically?
>
> Yeah, he's doing a CLFLUSH anyway which basically makes it a
> write-through...

The CLFLUSH is done afterwards (making it a use-once thing), so WB
might still be faster and would avoid the PAT headache ...

Thanks,

Ingo