DataSheet Proposal for Xen 3.3 Hypervisor Published

Stephen Spector published a post yesterday on the Xen blog featuring a proposed data sheet (PDF) for the upcoming Xen 3.3 release, which we said was in final testing stage in the beginning of this month.

Update 26 August: Xen 3.3.0 is available for download.

The complete list of new features in Xen 3.3 includes:

Performance and Scalability

  • CPUID Levelling
  • Shadow 3 Page Table Optimizations
  • EPT/NPT 2MB Page Support
  • Virtual Framebuffer Support for HVM Guests
  • PVSCSI — SCSI Support for PV Guests
  • Full 16-bit Emulation on Intel VT
  • Support for memory overcommit allowing more VMs per physical machine for some workloads


  • PVGRUB Secure Replacement for PYGRUB
  • IO Emulation “stub domains” for HVM IO
  • Green Computing
  • Enhanced C & P State Power Management
  • Graphics Support
  • VT-d Device Pass-Through Support


  • Upgrade QEMU Version
  • Multi-Queue Support for Modern NICs
  • Removal of Domain Lock for PV Guests
  • Message Signalled Interrupts
  • Greatly improved precision for time-sensitive SMP VMs

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