is there a vCPU hard limit for bhyve guests?

[Rodney W. Grimes]

> Hi,
> 
> On a host with hw.ncpu=48 I tried to start a bhyve guest with -c 24 and
> it failed to start. So I tried -c 16 and it starts and runs as
> expected. Any more than -c 16 fails to run.
> 
> Is a maximum of 16 vCPU hardwired somewhere, and if so, why? Is there a
> way to overcome the limit?

man bhyve
Look at -c option, default is 1 max is 16.

There is a compile time constant VM_MAXCPU, you can raise that
to 20, then other problems come about that require more patching.

Last time I played with this it failed above 16, I suspect
some other places have had a bad derived constant using the
assumption that 16 is the max.

> thanks,
> -- 
> J.
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-- 
Rod Grimes                                                 rgrimes at freebsd.org