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    SubjectRe: [PATCH v12 7/7] x86/crash: Add x86 crash hotplug support
    On Wed, Oct 12, 2022 at 03:19:19PM -0500, Eric DeVolder wrote:
    > We run here QEMU with the ability for 1024 DIMM slots.

    QEMU, haha.

    What is the highest count of DIMM slots which are hotpluggable on a
    real, *physical* system today? Are you saying you can have 1K DIMM slots
    on a board?

    I hardly doubt that.

    > So, for example, 1TiB requires 1024 DIMMs of 1GiB each with 128MiB
    > memblocks, that results in 8K possible memory regions. So just going
    > to 4TiB reaches 32K memory regions.

    Lemme see if I understand this correctly: when a system like that
    crashes, you want to kdump *all* those 4TiB in a vmcore? How long would
    that dump take to complete? A day?

    IOW, how does a realistic use case of this look like - not a QEMU one?

    Thx.

    --
    Regards/Gruss,
    Boris.

    https://people.kernel.org/tglx/notes-about-netiquette

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