Any plans to increase the maximum number of virtual CPUs above 16?

[Rodney W. Grimes]

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> On Tue, Nov 27, 2018 at 10:06:52PM +0000, Simon Connah wrote:
> > I was reading the bhyve man page and noticed that it said the maximum number
> > of virtual CPUs is limited to 16. With AMD Epyc being out with 32 cores and
> > 64 threads per CPU and being able to have 2 of them in one system this
> > number seems rather low by modern standards.
> > 
> > Are there any plans to increase this number to something like 32 virtual
> > CPUs?
> 
> I'm running into this. I have a server that can handle way more than
> 16 vCPUs. I know this topic has been talked about several times, and
> theoretical discussions keep taking place.
> 
> A bit more than two years later, and this is still a topic of
> discussion. I'm curious if anyone has a patch to punish me with. I'm
> very happy to be a guinea pig.

Several in phab, probably need rebased, its my WIP to eliminate
the compile time constant.  If you need more vCPU's it is just
a recompile of the kernel, libvmm, and bhyve(8) iirc.  Up the
value of MAX_VCPU.

https://reviews.freebsd.org/D10070
https://reviews.freebsd.org/D18816
https://reviews.freebsd.org/D18846

I believe all the fixes that allow you to increase VM_MAXCPU
up to something like 240 have all been committed.  

> Thanks,
> 
> -- 
> Shawn Webb
> Cofounder / Security Engineer
> HardenedBSD
> 
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-- 
Rod Grimes                                                 rgrimes at freebsd.org