Since r347532 (merged to stable/12) we only count user-wired pages
towards the system limit. However, we now also treat pages wired by
hypervisors (bhyve and virtualbox) as user-wired, so starting VMs with
large amounts of RAM tends to fail due to the low limit. I've seen a
number of reports of this with both bhyve and virtualbox.
I propose increasing the default value. The point of the limit is to
provide a seatbelt to ensure that the system can reclaim pages, not to
impose some policy on the use of wired memory. Now that kernel-wired
pages are not counted against the limit, I believe it is reasonable to
increase the default value (and merge the change to 12.2).