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. -Adam 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. > > _______________________________________________ > CentOS-virt mailing list > CentOS-virt at centos.org > http://lists.centos.org/mailman/listinfo/centos-virt > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos-virt/attachments/20091110/34532b9f/attachment-0003.html>