On Sun, Mar 14, 2021 at 01:17:05AM +0000, Joseph Mayer wrote:
> Hi,
>
> Apologies if I missed any earlier clarification on the mailing list of
> this question:
>
> What should the size of my swap partition be exactly, at least, for it
> to guaranteedly be big enough to contain a whole kernel crash dump, if
> the kernel crashes?
>
> I would presume the exact size of the RAM, or are there headings that add
> some bytes or kilobytes, or some further annotations that may take how
> much, a gigabyte extra?
>
> Thanks,
> Joseph
>
A crash dump needs a bit more than physical RAM. If you use the
autoallocater when creating a disklabel, it uses max 2 * physmem + 256M,
to have room for two crash dumps. See
src/sbin/disklable/editor.c:editor_allocspace().
-Otto
