[Bug 237429] bhyve: Performance regression after 12 upgrade

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237429

--- Comment #8 from Rodney W. Grimes <rgrimes at FreeBSD.org> ---
Something that jumps out is:
warning: total configured swap (58982400 pages) exceeds maximum recommended
amount (16155552 pages).

You have ~60G of swap space configured, the system only has 16G of memory,
do you actually expect to over commit near 4x on memory?

To go with this the 3 vm's you show are 4G in memory size, so they would
need 12 of the 16G for guests, leaving your host running ZFS with only
4G of memory.  Have you tuned the arc cache to be < than say about 2G
as with just these 3 VM's your gong to start having memory pressure.

I see 16 tap devices configured manually, this is normally handled by
vm-bhyve, but leads me to the question how many VM's are you trying to
run at once and what is the total memory footprint?

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