On 4/1/15 6:30 PM, Udo Rader wrote:
Hi all,

first please excuse if this may be a FAQ, but even though I am a long
time linux admin (~1996), I am quite new to the *BSD world and I am
trying to evaluate if FreeBSD fits our virtualization needs.

So, for my many questions:

As far as my homework digging revealed, FreeBSD supports four hypervisors:

* bhyve
* KVM
* QEMU
* VirtualBox
KVM is a linux beast and while some work was done a long time ago to try port it,
I believe it was never really completed..
Bhyve is FreeBSD's "KVM".  it requires
hardware support but is actively supported and reliable (for me).
QEMU... yes.. but I haven't used it in a long time
VB.. seems to work fine.. it's packaged with PBSD as an integrap part and has a UI, unlike Bhyve.
Xen.  works but I've not tried it.


I understand, that bhyve is native to BSD and will probably be the most
effective. But given its relatively 'young age', is it production ready
for (non nested) x86/amd64 linux guests?

While I know the differences between KVM, QEMU and VirtualBox quite well
for myself under linux, how do they compare when being run on FreeBSD?
For example, KVM is tightly integrated with the linux kernel and thus
outperforms the other two. Is that still true under FreeBSD?
s/KVM/Bhyve/


Do the FreeBSD ports of QEMU and/or KVM support ARM guests?
I think QEMU does.

For KVM guests, are the virtio features working (like memory ballooning)?
s/KVM/Byhve/    .. yes though people are still working on it.

Right now, we are virtualizing mostly using linux+KVM. Will there be
major differences (aka glitches ;) if we switch the host OS to FreeBSD
for existing KVM guests?

Bhyve only supports raw disk images.. I'ts quite early in it's developement life so some features may not
be present yet.
VB should just work with VB machines from Linux on the same architecture as long as you are not using
more esoteric features.. (usb passthrough?).


Thanks

Udo





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