Re: Bhyve process consumes way too much CPU

From: Mario Marietto <>
Date: Mon, 20 Mar 2023 15:11:55 UTC
Hello Julie.

As I said some days ago,I'm trying to install homeassistant. For the moment
I'm using Ubuntu 20.04 that I have installed on the Jetson nano,but later I
will use Ubuntu within bhyve on FreeBSD. Unfortunately,a developer,I
suppose,told me that homeassistant is not supported on ubuntu. In Fact I
tried to do that following this tutorial :

but I've got a lot of errors. I've started a thread on reddit,asking for
help,here :

and he/she told me that ubuntu is not supported. So,which linux
distribution have you used within bhyve ? thanks.

On Sun, Mar 19, 2023 at 7:12 PM Miroslav Lachman <> wrote:

> On 18/03/2023 14:59, Julie Koubová wrote:
> > Hey everyone,
> >
> > I'm running Linux (Home Assistant OS) in Bhyve on FreeBSD 13.1. I use
> > PCI passthrough to allow the VM to access a USB card with a couple of
> > radio dongles. The host machine is an Intel Core i3 13100 with 64 GB of
> > RAM. The CPU has 4 physical cores (8 hyper-threaded). The virtual
> > machine is assigned four cores.
> >
> > The host load averages are 0.39 0.39 0.40 right now, which seems way too
> > much. The same workload was previously handled by a Raspberry Pi 4, and
> > the CPU usage there was under 10% when not doing anything special.
> > Inside the guest OS, the CPU usage is reported around 5%, which seems
> > reasonable.
> >
> > What's wrong? How can I start debugging this issue? I use ZFS on the
> > host, vm-bhyve to manage the virtual machines, and I don't have a swap
> > partition.
> I had similar problem few years ago. Never solved. Exhibited on bhyve
> and VirtualBox too. The problem was "the more vCPU for VM, the slower VM".
> Can you try to set just 1 vCPU to your VM? In my case, VM with 1 vCPU
> was fast, almost no overhead, 2 v CPUs slightly slower but 4 or more was
> slow as hell.
> I would also recommend not to overprovision real CPU core count to vCPU
> and not use multi/hyper threading cores as real cores. With your CPU,
> use only 4 cores to assign to all your VMs (4 VMs with 1 vCPU each, or 2
> VMs with 2 vCPU each, 1 VM with 4 vCPU)
> Miroslav Lachman