Ubuntu 14.04 On Amazon EC2: Xen PV vs. HVM
A common benchmark request at Phoronix lately has been to compare the Xen PV (para-virtualization) performance to Xen HVM (Hardware-assisted virtualization). Well, now that Ubuntu 14.04 LTS has been released, here's some benchmarks from within Amazon's EC2 compute cloud when comparing Ubuntu 14.04 Server PV and HVM instances.
Xen has long supported para-virtualization (PV) as its means of virtualization support for best performance and stability while minimizing overhead between Dom0 and the hypervisor by the two operating system software stacks working more closely together. The "newer" option for Xen virtualization users is to act as a hardware-assisted virtual machine (HVM) whereby the host and guest kernels don't need to be patched, Windows can run as a HVM guest, and there's complete hardware isolation.
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