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    SubjectRe: Using >1GB RAM
    Date
    > making up for a maximum of 0xfc (252) megabytes of kernel virtual address
    > space. Access to physical memory (for /dev/mem or paging) is done
    > using temporary mappings.

    OpenBSD has this luxury however because it lacks a unified buffer cache. Linux
    kernel side may need mappings to more than 252Mbytes of pages



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