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    SubjectRe: memory beyond4GB invisible to the system even though CONFIG_HIGHMEM64G=y
    Date
     > I am running kernel 2.6.28 on a computer with 8GB RAM. The BIOS
    > detects all 8GB, yet
    >
    > jk@as12:~$ free
    > total used free shared buffers cached
    > Mem: 3622504 799696 2822808 0 90936 369604
    > -/+ buffers/cache: 339156 3283348
    > Swap: 6867776 0 6867776

    The message in your kernel log:

    [ 0.000000] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 4096MB of RAM.
    [ 0.000000] ------------[ cut here ]------------
    [ 0.000000] WARNING: at arch/x86/kernel/cpu/mtrr/main.c:1662 mtrr_trim_uncached_memory+0x283/0x2a4()

    is a clue. You might want to look for a BIOS update for your
    motherboard.

    - R.


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