Date: Fri, 15 Jan 2021 15:00:37 +0200 From: Andrei Martin <andrei.cos.martin@gmail.com> To: freebsd-arm@freebsd.org, freebsd-virtualization@freebsd.org, Mihai Carabas <mihai.carabas@gmail.com>, Darius Mihai <dariusmihaim@gmail.com>, Elena Mihailescu <elenamihailescu22@gmail.com> Subject: Re: [bhyve][arm64] Number of allowed vcpus Message-ID: <CAC%2BC28R_NgsTbRj89xf54Fdx5Rj8oEUF-OY=pSKKBrrm0b-JJg@mail.gmail.com> In-Reply-To: <CAC%2BC28QevGZZhb5trdA=UN-yZp_rLF1pkA8CPhzE3WUuhRv0pw@mail.gmail.com> References: <CAC%2BC28QevGZZhb5trdA=UN-yZp_rLF1pkA8CPhzE3WUuhRv0pw@mail.gmail.com>
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Thanks for you responses and sorry for not specifying the guest's device
tree.
I've summed up your proposals and sketched and algorithm:
N - the number of vcpus from the '-c' parameter
X - the number of vcpus from the device tree
if there isn't the parameter -> start the vm with X vcpus
if there is the parameter --> if N <= X -> start the vm with N parameters
|-> if N > X -> throw an error
I believe this gives the opportunity to rebuild the device tree and use all
vcpus (first branch)
or let the device tree as it is (more vcpus) but use only a subset of them.
Is this alright?
Thanks,
Andrei
On Wed, Jan 13, 2021 at 1:55 PM Andrei Martin <andrei.cos.martin@gmail.com>
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
>
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