Found in xen wiki a remark of Jeremy Fitzhardinge about the performance of Xen 4.0 (Xen Summit at Intel Shanghai Nov 19-20, 2009, Slide 7):

Performance still needs attention

  • Seems to be ~10-20% hit vs 2.6.18-xen

… but you get a current 2.6.31/32/… Linux kernel.

Preparations to boot a Xen 4.0 dom0  kernel: 2.6.18-to-2.6.31-and-higher

Status of Xen features in Linux kernel: XenParavirtOps

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