VMware有文档讲这个。
KVM requires hardware-assisted virtualization, so it can only be run under ESXi 5.0, Workstation 8, Player 4 or Fusion 4 (or later). KVM performs relatively poorly as a guest hypervisor on Intel CPUs using virtualized Intel VT-x. Performance is improved with Linux kernel versions 3.0 and greater.
提到要求esxi 5.0以上。而且在Intel平台上,基于虚拟化后的vt-x指令运行KVM的性能“relatively poor”,Linux内核高于3.0会有所改善
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