[Bug 237429] bhyve: Performance regression after 12 upgrade

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

--- Comment #10 from Rodney W. Grimes <rgrimes at FreeBSD.org> ---
(In reply to doctor from comment #9)
> 1) In case I wish to expand to say 64G RAM I can do so without trying to rebuild the server.
Ok, valid, thanks for clarifing.

> 2)Running UFS not ZFS.  Did I forget to mention this?
Your system shows it has loaded ZFS:
ZFS filesystem version: 5
ZFS storage pool version: features support (5000)
you can say your not using it, but your dmesg says differently.

> 3) In 11.2 There were not problems.  in 12.0 These problems suddenly manifested.

Are you certain that the only change is that of from 11.2 to 12.0,
or did some other change, perhaps a change not considered is the
cause of issues.  I am simply trying to identify what performance
would be low on 12.0 independent of any prior status.

> 4) I was able to put up to 8 VM in 11.2 and below without issue.
8 VM's with 4G each on 11.2 with 16G of memory, I do not accept this as true,
that is 32G of memory commit + host memory needs.  That should of been trashing
itself unless those 8vm's are pretty well idle

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