Re: [PATCH 0/8] x86, acpi: Move acpi_initrd_override() earlier.

[H. Peter Anvin]

Well... relying on MTRRs is a big cost in complexity and failure modes.

Tejun Heo <tj@xxxxxxxxxx> wrote:
>Hello,
>
>On Fri, Aug 23, 2013 at 03:08:55PM +0200, H. Peter Anvin wrote:
>> What is the point of 1G+MTRR?  If there are caching differences the
>> TLB will fracture the pages anyway.
>
>Ah, right.  Consuming less memory / cachelines would still be a small
>advantage tho unless creating split TLB from larger mapping is
>noticeably less efficient.  If the extra logic to do that is small,
>which I think it'd be, it'd be a gain at almost no cost.
>
>Thanks.

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