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

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Date:	Mon, 28 Oct 2013 03:53:14 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...nel.org>, Andreas Werner <wernerandy@....de>
CC:	Borislav Petkov <bp@...en8.de>, tglx@...utronix.de,
	mingo@...hat.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

On 10/28/2013 03:51 AM, Ingo Molnar wrote:
>>
>> If i mark the region WB and call clflush my system will crash without
>> any message, it just stop working.
> 
> Yeah, I was wondering whether it's valid at all to mark IO memory as 
> cacheable - with the lack of MESI transactions and all that ...
> 
> So it's apparently not valid and we've got to live with WT as the 
> 'best' caching/bursting method for reads.
> 

On a lot of systems I'm not sure if even WT is legitimate.

	-hpa


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