[Bug 231117] bhyve: I/O lockups inside guests

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231117

--- Comment #23 from Rodney W. Grimes <rgrimes at FreeBSD.org> ---
(In reply to Mateusz Kwiatkowski from comment #22)
> VMs may use 8GBs of RAM in total. Hypervisor has 64GB in total. So VMs and ARC could create OOM condition but the statistics I provided were taken at themoment when one of the VMs hang. I'll reduce arc_max anyway to 8GB to make sure this isn't the cause.

Not sure you need to cut arc_max to 8GB, but just make sure that arc_max +
total(all VM's) + host usage is < than 64GB.

I have been pointed at:
If the guest(s) are using virtio-block, it might be interesting to
check the status of the IO queues for those devices.  The reported
issues could be a case of https://smartos.org/bugview/OS-7613.
(Posted as https://reviews.freebsd.org/D19501)

I have pinged the D19501 review and it looks like some forward motion has
happened there.  You *may* if you can want to try the patch that is there now,
knowing that it is about to be revised.

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