Re: [PATCH] X86: MM: Add PAT Type write-through in combination withmtrr

From: H. Peter Anvin
Date: Mon Oct 28 2013 - 06:56:52 EST

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.


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