KVM vs Xen

KVM vs Xen

Xen  

ParaVirtualization

Full Virtualization (CPU)  

CPU *

Guest Kernel-2.6.23

Host Kernel-Patch

Intel VT ▲

AMD-V ▲

Citrix

BVT(Borrowed Virtual Time)

VT-x, VT-i, SVM, and KVM

KVM  

Full Virtualization (CPU)  

I/O *  

Kernel-2.6.20 (2007/02)

Intel VT-x •

AMD-V   •

RedHat

Linux Kernel 

VT-x and SVM

#CPU

                Xen-PV        Xen-HVM KVM-HVM Help

Phoronix Test Suite - Kernel Compilation 2304.17 secs 2885.10 secs 3228.48 secs Fewer are better

Phoronix Test Suite - FFmpeg 20.87 secs 20.96 secs 21.79 sces Fewer are better

Phoronix Test Suite - Wavpack 17.34 secs 18.16 secs 18.78 secs Fewer are better

Para-Virtualization Xen *

Full Virtualization Xen-HVM * (Xen-PV > Xen-HVM > KVM-HVM)

#Memory

Para-Virtualization Xen *

Full Virtualization (Floating point arithmetics) KVM-HVM O Xen-HVM X

#Disk I/O

Xen Para-Virtualization (most)

bigFileReading Xen-HVM O Xen-PV & KVM-HVM X

bigFileComputing Full Virtualization KVM-HVM O Xen-HVM X

>Ref

http://trac.nchc.org.tw/grid/wiki/KVM_vs_Xen