Messages in this thread | | | Date | Wed, 12 Oct 2022 22:41:12 +0200 | From | Borislav Petkov <> | Subject | Re: [PATCH v12 7/7] x86/crash: Add x86 crash hotplug support |
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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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