https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195882

--- Comment #7 from Mark Johnston <ma...@freebsd.org> ---
(In reply to rozhuk.im from comment #6)
Your test program is dirtying pages by writing to them, so the OS is forced to
flush them to disk before they can be reused.  It is easy to dirty pages more
quickly than they can be written back and freed, in which case the system will
continually be starved for free pages.  Currently I don't believe we have any
mechanism to restrict the amount of dirty memory mapped into a given process.

Regarding kernel dumps, if you have space on a raw partition, you can simply
point dumpon(8) at that.  If not, you might consider using netdump(4).

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