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    SubjectRe: [Xen-devel] [PATCH 10/27] xen: make sure swiotlb allocation isphysically contigious
    Jan Beulich wrote:
    > While on native using alloc_bootmem_low_pages() is a requirement here,
    > on Xen this should explicitly not be used, as we realized just a couple of
    > days ago:

    Which conversation was this?

    > The way the bootmem allocator works, running out of space
    > below 4Gb is pretty easy on machines with lots of memory, and since the
    > swiotlb is a requirement for Dom0, the risk of allocation failures must be
    > kept as low as possible.

    Are we talking about a 32 or 64 bit dom0 here? If its 32-bit, then yes,
    low memory is a precious resource, but I don't see why that depends on
    the total amount of memory. And if its 64-bit, why is below-4G
    particularly constrained? That would only matter for 32-bit devices?


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