Re: Cache incoherencies

Richard Henderson (rth@twiddle.net)
Thu, 26 Aug 1999 19:44:45 -0700

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On Fri, Aug 27, 1999 at 12:33:02AM +0100, Alan Cox wrote:
> > Say i have 12Mb RAM. So that's 3 4Mb pages. When I need an uncached
> > page, I'd map it into the 64M-68M range, mark that range as uncached,
> > and return the pointer in the 64-68M range. Now we have a "hole" in
>
> And the rest of that 4Mb range is loaded with critical data now running
> uncached. Your box crawls like a 286.

No, he was suggesting a _second_ virtual mapping for the page.

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