On Mon, 2012-03-26 at 18:34 +0200, Alexander Lyakas wrote:
> Greetings everybody,
> I am running stock ubuntu-natty 2.6.38-8, with KVM 0.14.0 and libvirt

Any chance you can try upstream qemu-kvm?  Interrupts, including msi-x
have been given an overhaul recently.  Thanks,

Alex

> 0.8.8. I am using Intel 82599EB dual-port 10Gb NIC with VFs spawned by
> each one of the PFs. Those VFs are further assigned to KVM instances
> with PCI-passthrough using libvirt. Each instance receives 4 VFs (two
> VFs from each PF).
> Usually when KVM starts, messages like these appear in the kernel log
> of the physical machine:
> syslog.ubuntu-sata-51 146907  Mar 25 18:19:51 ubuntu-sata-51 kernel:
> [51267.029108] pci-stub 0000:03:13.1: claimed by stub
> syslog.ubuntu-sata-51 146908  Mar 25 18:19:51 ubuntu-sata-51 kernel:
...

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