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@sigovs.comwrote:
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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