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    SubjectRe: PROBLEM: Linux 2.6.0-test11 only lets me use 1GB out of 2GB ram.
    On Thu, Dec 11, 2003 at 12:33:39AM -0500, Ed Sweetman wrote:
    > I thought highmem wasn't necesarily needed for memory <=2GB? Highmem
    > incurs some performance hits doesn't it and so the urge to move to it
    > with only 2GB is not very attractive. Anyways i'm just interested in if
    > that's the case or not since 2GB is easy to get to these days and i had
    > heard that highmem could be avoided passed the 1GB barrier.

    You're probably thinking of 2:2 split patches.

    2:2 splits are at least technically ABI violations, which is probably
    why this isn't merged etc. Applications sensitive to it are uncommon.

    Yes, the SVR4 i386 ELF/ABI spec literally mandates 0xC0000000 as the
    top of the process address space.

    -- wli
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