[CentOS-virt] XEN and RH 6

Adam adam0x54 at gmail.com
Tue Nov 10 20:22:19 UTC 2009

Fedora 12 doesnt come with Xen and from what I heard RHEL 6 will be based on
F12. In the F12 release notes it states that they might port Xen in 2.6.33.
"The kernel package in Fedora 12 supports booting as a guest domU, but will
not function as a dom0 until such support is provided upstream. Work is
ongoing and hopes are high that support will be included in kernel 2.6.33
and Fedora 13."
I will start testing kvm+virtio+ovirt for my 5-6 virtual machines to migrate
from xen. It seems that its the way to go for future deployments. Xen works
fine for me now so I am not in a rush.

I started with xen, moved to xenserver, moved back to xen and I will start
testing kvm soon.


On Tue, Nov 10, 2009 at 1:52 PM, Scott McClanahan <smcclanahan at sigovs.com>wrote:

> > Yeah.. Xen paravirtualized mmu is fast, and in some (many) cases beats
> > CPU hardware virtualized mmu.
> >
> > KVM has 'pvmmu' aswell, but it's not as good, so KVM is faster with CPU
> > hardware virtualization. But that's a problem of KVM only, they haven't
> > managed to optimize the pvmmu. And they're going to drop it altogether.
> >
> > KVM people tend to say 'paravirtualized mmu is slow', but they just mean
> > KVM implementation of it sucks :)
> >
> > -- Pasi
> I haven't tested or seen any benchmarks but I wonder how much the
> addition of a page table for virtualized guests will help.  Not to
> mention newer features like a virtualized task priority register and
> ASID could continue to require less paravirt code in the guest.  I get
> my two new 5500 series servers in a few weeks so I'm pretty excited to
> see some of the second gen hardware virtualization assist features in
> action.
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