Re: [bhyve][arm64] Number of allowed vcpus

> Hello,
> 
> >From my perspective bhyve should use what is stated in the device tree if
> no parameter is given and throw an error when N is greater than the device
> tree value.
> 
> Mihai

That seems to be one reasonable solution.  I am not very informed on what
the CPU over commit situation is on an ARM cpu with respect to virtualization.

I would also propose as an alternative to just do what was asked by the
user, which is the current amd64 implementation, OR do as asked and
emmit a warning message.

I would ask given what was said above: isnt this the same situation as
if the sum of all VM VCPU's is more than the total cores in the system?
That is a very common situation, and one we must not restrict.

> On Wed, Jan 13, 2021 at 1:55 PM Andrei Martin <[email protected]>
> wrote:
> 
> > Hello,
> >
> > While working on enabling multiple virtual cpus for the arm64 virtual
> > machine
> > I used the bhyve's "-c N" parameter to create N cpus (it gets only the
> > cpus, in contrast to the amd64). If N is smaller than the number of cores
> > described in the device tree it will enable only N and if it's larger it
> > will enable only the number of cores from the device tree.
> >
> > I don't know if it is the best approach. Another way would be to enable
> > all the cpus from the device tree, no more, no less.
> >
> > Do you have any suggestions?
> >
> > Andrei
> >
> _______________________________________________
> [email protected] mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization
> To unsubscribe, send any mail to "[email protected]"
> 

-- 
Rod Grimes                                                 [email protected]
_______________________________________________
[email protected] mailing list
https://lists.freebsd.org/mailman/listinfo/freebsd-arm
To unsubscribe, send any mail to "[email protected]"