Re: [Xen-users] who comes from kvm?

[Bhasker C V <bhasker@xxxxxxxxxxxxx>]

On Sat, 12 Feb 2011, Mauro wrote:

> On 12 February 2011 22:45, Bhasker C V <bhasker@xxxxxxxxxxxxx> wrote:
> > On Fri, 11 Feb 2011, Javier Guerra Giraldez wrote:
> >
> > > On Fri, Feb 11, 2011 at 12:24 PM, Steve Sapovits <steves06@xxxxxxxxxxx>
> > > wrote:
> > > > (Xen is a type 1, KVM is a type 2)
> > > that's not exact since KVM doesn't run 'on top of' the Linux kernel;
> > > it's part of the Linux kernel. Âas such, it has the same 'bare metal'
> > > access to hardware as the rest of the kernel or the Xen hypervisor.
> > >
> > > IMHO, the main difference is that Xen has its own scheduler and
> > > arbitration logic, while KVM reuses existing Linux code. Âpro: it can
> > > be tuned to the specific case of handling VMs. Âcon: a little
> > > duplication of code
> > I second this. I have used KVM extensively and find it is very stable and
> > useful in case we are running a dissimlar OS (like windows and SunOS). KVM
> > is really good in a lot of respects (for eg:- in case of USB if you want
> > to send a raw USB device to the guest machine). I have found KVM very
> > stable. As Javier told, KVM is _not_ running on top of kernel. It is a
> > totaly different sub-system and gives near-baremetal performance if properly
> > configured with virtio drivers.
> >
> > Almost everything which can be done on Xen can be done on KVM (but IMO
> > vice-versa is not totally true).
> Do you use xen or kvm on your productions servers?
I use KVM. They are running Debian (very light one only having the base 
and the KVM support) and on top of this with RAW LVs I am running windows 
on KVM. These windows machines are using certain USB devices (direct 
access passthrough) and they are quite happy for a long time. I must say 
that I was a bit lazy to bring up the usb passthrough on xen which i had 
problems with.

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