Re: Can I allocate some CPUs to the bhyve host?

I think you can.

bhyve has an option named -p which maps the vcpu to the host cpu. In our 
cluster we have the following in vm-bhyve’s config file:

bhyve_options="-p 0:28 -p 100:156 -p 1:29 -p 101:157 -p 2:30 -p 102:158 -p 3:31 
-p 103:159 -p 4:32 -p 104:160 -p 5:33 -p 105:161 -p 6:34 -p 106:162 […] 197:253 
-p 98:126 -p 198:254 -p 99:127 -p 199:255”

Now, to be fair I am matching a single vCPU to a host CPU (and then using the 
cpuset subsystem to “Detach” that cpu from the host), but I don’t see a reason why 
you would not be able to match multiple vCPUs to a single host CPU. (someone 
correct me if I'm wrong).

Hope this helps.

—
Antranig Vartanian
https://antranigv.am/
PGP Key ID: 0x2D59F21C

> On 15 Feb 2025, at 7:34 PM, FreeBSD Louisville <freebsdlouisville@gmail.com> wrote:
> 
> It appears to me that a user could over-provision CPUs to guests, causing massive slowdown of the system.  Can I specify CPUs to be "locked" to the host?  If I have 16 processors available, could I start guests that want 32 CPUs?
> 
>