Re: [RFC Patch] use MTRR for write combining if PAT is not available

[Arjan van de Ven]

Henrique de Moraes Holschuh wrote:
> On Fri, 09 Oct 2009, Arjan van de Ven wrote:
> > > I've found a problem with X.org not setting up MTRR for the
> > > framebuffer memory. After I investigated I think this is not a
> > > X.org problem, but a kernel issue.
> > is there any CPU left that does not support PAT ?
>
> A few million of them.  Like every Centrino laptop out there, unless the
> kernel blacklist for PAT on Intel CPUs is wrong.

afaik it is extremely conservative right now. FAR too much so.

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