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Date:	Tue, 20 Oct 2009 22:35:12 +0200
From:	Thomas Schlichter <>
To:	Ingo Molnar <>
Cc:	Jan Beulich <>,
	Suresh Siddha <>,,,,,,,,,,,,,,,
Subject: Re: [RFC Patch] use MTRR for write combining if PAT is not available

Ingo Molnar wrote:
> * Thomas Schlichter <> wrote:
> > > or Perhaps just try to add mtrr only for the pci mmap case like the
> > > 4th patch in this series..
> >
> > I'd prefer this! ;-)
> Hm, we could perhaps do that - but i think we should only do that on
> systems that have PAT disabled.

The patch I sent should do exactly that.

> Which brings up the question of how to properly QA such a narrow segment
> of the market. Maybe disabling CONFIG_X86_PAT should enable that logic
> too.

When CONFIG_X86_PAT is disabled, pat_enabled is 0, and thus my new code should 
be active. Or do I miss something?

What do you think about the latest version of my patch series I just sent?

Kind regards,
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