Date: Wed, 13 Jan 2021 06:55:43 -0800 (PST) From: "Rodney W. Grimes" <freebsd-rwg@gndrsh.dnsmgr.net> To: Mihai Carabas <mihai.carabas@gmail.com> Cc: Andrei Martin <andrei.cos.martin@gmail.com>, freebsd-arm@freebsd.org, freebsd-virtualization@freebsd.org Subject: Re: [bhyve][arm64] Number of allowed vcpus Message-ID: <202101131455.10DEthxJ041740@gndrsh.dnsmgr.net> In-Reply-To: <CANg1yUshoDff6ahaGY1Au=BdnzuX2yh1n-NxWfUaCnmSmzOVMg@mail.gmail.com>
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> 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 <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 > > > _______________________________________________ > freebsd-virtualization@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization > To unsubscribe, send any mail to "freebsd-virtualization-unsubscribe@freebsd.org" > -- Rod Grimes rgrimes@freebsd.org
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