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    SubjectRe: memory beyond4GB invisible to the system even though CONFIG_HIGHMEM64G=y
    Date
     > please do
    > 1. boot linux with "disable_mtrr_trim" in grub.conf etc
    > 2. after booting input:
    > echo "base=0x100000000 size=0x20000000 type=write-back" >/proc/mtrr

    Is there any way we can have the kernel do this automatically if there
    are any free mtrr slots? I would guess this type of BIOS bug is pretty
    common (desktop boards not validated with > 4GB of RAM), and having the
    kernel throw away 4GB of memory unless the user does some fancy
    scripting is not very friendly (not to mention the fact that things are
    likely to be very slow until the mtrr fixup script runs).

    - R.


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