/ALLOCATE
       /NOALLOCATE (default)

    Allocates pages during the next reboot of the system as specified
    on the command line. (The default is taken from the existing
    Reserved Memory Registry entry.) The physical alignment of the
    pages is based on the maximum granularity hint factor that can
    be used to map the pages depending on the size of the reserved
    memory.

    Possible granularity hint factors are 512 pages (or 4 MB) and 64
    pages (or 512 KB). Therefore, assuming an 8-KB system page size,
    reserved memory is physically aligned as follows:

    o  size >= 4 MB: physically aligned on a 4-MB boundary

    o  size < 4 MB: physically aligned on a 512-KB boundary

    If you specify /NOALLOCATE, or if you do not specify /ALLOCATE,
    memory is reserved only by reducing the system's fluid page
    count, but no specific pages are set aside.