The SPEC benchmark for RHEL5.5 with KVM was released yesterday. http://www.spec.org/virt_sc2010/press/release.html "The non-profit Standard Performance Evaluation Corp. (SPEC) has released SPECvirt_sc2010, the first vendor-neutral benchmark to measure the performance of datacenter servers used for virtualized server consolidation." Only result left standing at launch: http://www.spec.org/virt_sc2010/results/res2010q3/ IBM x3950M3 + RHEL 5.5/KVM = 1169@72 SPECvirt_sc2010@VMs