[Bug 280846] Low memory freezes / OOM: a thread waited too long to allocate a page

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280846

--- Comment #52 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Henrich Hartzer from comment #50)

Were Active, Inact, Laundry, Wired, and Free such that
Laundry was huge in each case (and the others were not)?
Did the lead up to the failures have Laundry increasing
at a notable sustained rate vs. did it more suddenly
jump?

If you had spare USB media and a USB port, for example,
having a swap space that is say, something like 3.6*RAM
(so RAM+SWAP == 4.6*RAM) and seeing if the RAM+SWAP use
stabilized before running out of RAM+SWAP could be
interesting. If it stabilized, you might be able to see
how much RAM+SWAP your example-being-tested needs.
That can help for future planning.

(The 3.6 factor should avoid warnings when the swap is
added about potentially being mistuned.)

(This USB or analogous test need not be biased for the
performance you would like in normal operation.)

Now that you get reasonable/useful Active, Inact, Laundry,
Wired, and Free figures while monitoring in top, such
explorations should now be possible via use of top.

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