[Bug 1258498] [NEW] Migration problems and low network performance with multi cpu

[Stefan Reiff]

Public bug reported:

Could you use the newer Qemu 1.7 and Libvirt 1.2 in Ubuntu Trusty?
In the Qemu 1.7 changelog i found, that the migration in 1.6 to older versions is broken (Migration was broken from QEMU <= 1.5 to 1.6; the new release fixes it.).

I am using Qemu 1.2 on Ubuntu 12.10 and with more than one cpu in the virtual machine and virtio as network interface and vhost=on the network is very slow. With one cpu in the vm you get the full speed.
I'm not sure, but i think this line in qemu 1.7 changelog solves the problem:
    VFIO now supports setting CPU affinity on MSI interrupts.

** Affects: qemu (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Migration problems and low network performance with multi cpu

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