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

[Trent Thompson]

Simon,
It is possible to go above that limit if you're willing to recompile the
VMM kernel module.

There has been some discussion as to why this was set to 16 recently (
https://lists.freebsd.org/pipermail/freebsd-virtualization/2018-November/006939.html
).

Some may experience problems at higher counts. I had no issues at 32, and I
believe someone else didn't have issues at 24.

The line `#define VM_MAXCPU    16    /* maximum virtual cpus */` is what
needs to be changed.

Reference:
https://lists.freebsd.org/pipermail/freebsd-virtualization/2016-September/004721.html

On Tue, Nov 27, 2018, 3:07 PM Simon Connah <scopensource at gmail.com 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?
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