Xen 4.2 Limits

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This document contains information about limits of Xen 4.2.

CPUs & Memory

  • Xen can scale up to 4,095 host CPUs with 5Tb of RAM.
  • Using Para Virtualization (PV), Xen supports a maximum of 512 VCPUs with 512Gb RAM per guest.
  • Using Hardware Virtualization (HVM), Xen supports a maximum of 128 VCPUs with 512Gb RAM per guest.

Other Limits

  • Maximum of 32K interrupts and 2k PCI segments: this limits the number of devices that can be

used in two ways.

    • The number of devices many can be attached to the system must fit into 2k PCI segments, i.e. 2k * 256 [buses] * 32 [devices] * 8 [functions])
    • The number of hardware interrupts they may surface (one would expect at least one interrupt per device function, so this is the stricter of the two limitations).
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