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

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Message-ID: <20131028103132.GA6274@gmail.com>
Date:	Mon, 28 Oct 2013 11:31:32 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Andreas Werner <wernerandy@....de>, tglx@...utronix.de,
	mingo@...hat.com, hpa@...or.com, x86@...nel.org,
	dave@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] X86: MM: Add PAT Type write-through in combination with
 mtrr


* Borislav Petkov <bp@...en8.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
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