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    SubjectRe: [PATCH] x86: 46 bit PAE support

    * Rik van Riel <> wrote:

    > H. Peter Anvin wrote:
    >> Rik van Riel wrote:
    >>> Testing: booted it on an x86-64 system with 6GB RAM. Did you really think
    >>> I had access to a system with 64TB of RAM? :)
    >> No, but it would be good if we could test it under Qemu or KVM with an
    >> appropriately set up sparse memory map.
    > I don't have a system with 1TB either, which is how much space
    > the memmap[] would take...

    Not if the physical layout is sparse. I.e. something silly like:

    BIOS-e820: 0000000100000000 - 0000000140000000 (usable)
    BIOS-e820: 0000200000000000 - 0000200040000000 (usable)

    Which is 1GB of RAM at 4GB physical offset, and another 1GB of RAM
    at 32 TB physical offset. Takes two gigs of real RAM and a kernel
    modified with your patch, to not get confused by this :-)


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      Last update: 2009-05-06 14:33    [W:0.020 / U:17.204 seconds]
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