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    SubjectRe: [PATCH] x86: mtrr cleanup for converting continuous to discrete - auto detect v2
    On Thu, May 1, 2008 at 2:26 PM, H. Peter Anvin <hpa@zytor.com> wrote:
    > Yinghai Lu wrote:
    >
    > >
    > > >
    > > > >
    > > > >
    > > > Yes, 16 GB systems are already mainstream; 32 GB is common, so I don't
    > see
    > > > any reason to stop at 2 GB. Instead, it should loop up to the physical
    > > > address size.
    > > >
    > >
    > > but our objective is that has 0xd0000000-0xe0000000 (WC) not to be
    > > overlapping with other MTRR entries (UC)..
    > >
    > >
    >
    > So, pray tell, how comes this algorithm can come up with a non-solution to
    > the problem presented to it?
    >
    > Overall, I'm feeling there is something really completely wrong if this
    > needs manual tunables of any sort.

    the problem is BIOS set MTRR like BIG WB - SOME SAMLL UC to spare mtrr regs.

    but later X server driver want to set some range to WC. that already
    is fallen in UC...

    YH


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