I believe it's because Xen adds overhead[0] in its process of working around the... | Hacker News

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		tekacs on June 17, 2015 \| parent \| context \| favorite \| on: Linode turns 12, transitions from Xen to KVM I believe it's because Xen adds overhead[0] in its process of working around the need for hardware virtualisation support[1], whereas KVM has much less overhead, but requires hardware support to run efficiently. [0]: http://dtrace.org/blogs/brendan/2013/01/11/virtualization-pe... [1]: Xen was built before such support was widely adopted.

alexforster on June 17, 2015 [–]

This is about right. A lot of the performance seems to be coming from lower hypervisor CPU overhead and better I/O virtualization with virtio.

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