Image via WikipediaAfter almost a year, a new major version of Xen hypervisor was released. Xen 4.1 adds several performance enhancements and support for very large systems.There's also a new API: Xen 4.1 includes support for old xend/xm tools, but they're deprecated. You should migrate to xl command and libxl toolstack. There are some significant differences, so upgrade path is not easy. A terrible idea in my opinion: Xen was always harder to run then its competitors, adding another obstacle definitely won't help. That is, unless you run a high-level tool, in which case you don't care about the gory details.
Now if only I can get my hands on a physical machine to run some tests...
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