To quote the original article
"Because Tsubame uses a KVM hypervisor and various cloud-like provisioning tools, it can run both Windows and Linux at the same time on different nodes, and offer users various types of processing configurations."
As one of the commentors on the original article pointed out, KVM is virtual machine software designed for linux, so is this benchmark comparing the performance of linux and windows virtual machines (running on a linux host), rather than comparing the performance of linux and windows directly? Or is this comment relevant only in the sense that Tsubame is currently running KVM and totally irrelevant in the context of the testing performed?