NetBSD
NetBSD is a popular choice for a dom0 OS because of its small and versatile design, which is a good match for the dedicated virtualization server model that Xen encourages. In our experience, a dom0 running NetBSD will use less memory and be at least as stable as one running Linux.
However, Linux people often make the mistake of assuming that NetBSD is exactly like Linux. It's not—it's kind of close, but NetBSD is the product of an evolution as long as Linux's, and it requires some practice to work with. In this section, we're going to assume that you're familiar with NetBSD's idiosyncrasies; we're only going to cover the Xen-related differences.
NetBSD's Historical Xen Support
NetBSD has supported Xen for a very long time—since NetBSD version ...
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