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    SubjectRe: [PATCH] convert parisc to sparsemem (was Re: [PATCH v3] mm: make expand_downwards symmetrical to expand_upwards)
    On Sat, 23 Apr 2011, James Bottomley wrote:

    > The boot sequence got a few seconds slower because now all of the loops
    > over our pfn ranges actually have to skip through the holes (which takes
    > time for 64GB).

    On my rp3440, the biggest gap seems to be 265GB:

    dave@mx3210:~$ cat /proc/iomem
    00000000-3fffffff : System RAM
    00000000-000009ff : PDC data (Page Zero)
    00100000-004acfff : Kernel code
    004ad000-00661fff : Kernel data
    40000000-4fffffff : IOVA Space
    100000000-27fdfffff : System RAM
    4040000000-40ffffffff : System RAM

    J. David Anglin
    National Research Council of Canada (613) 990-0752 (FAX: 952-6602)

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