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SubjectRe: 50 Watt idle power regression bisected to Linux-3.10
On Wed, Dec 11, 2013 at 03:56:55PM +0100, Ingo Molnar wrote:
>
> * Borislav Petkov <bp@alien8.de> wrote:
>
> > On Wed, Dec 11, 2013 at 01:43:52PM +0100, Peter Zijlstra wrote:
> > > Something like the below.. someone needs to double check and possibly
> > > add SNB/IVB EX parts if they're already available.
> >
> > Right, our friends at Intel would need to tell us which families/models
> > does AAI65 span... if, this is actually the case.
>
> I think CLFLUSH should be pretty universally available, IIRC graphics
> drivers were using it rather heavily in combination with
> write-combining MTRRs, both on Linux and on Windows.

The availability isn't the problem; the cost is. We shouldn't issue one
if its not required. Only 'broken' EX hardware needs it.


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