Re: [Xen-users] VT-d CPU resources

[Linus van Geuns <linus@xxxxxxxxxxxxx>]

Hey,

On Fri, Jun 22, 2012 at 3:58 PM, amiard brice <perso@xxxxxxxxxxxxxxx> wrote:
> Hello
>
>
>
> I'm working on XEN since one month now.
>
>
>
> I want create four domU with 2 PCI device per dom.
>
> I've bought a backplane with 3 bridges PCIe 1x to PCI and 4 PCI directly
> connected to the PCH (Q67).
>
> (Moreover PCI card (ethernet card) are composed with a PCI bridge)

Why do you still use PCI ethernet cards when your system provides PCIe
connectivity?

> I've succefuly created 4 domU with bakend devices, with option
> "pci-backend-strict-check" disable.
>
> Iâve try with it but even if all PCI ports behind PCIe to PCI bridge appears
> in pci-list-assignable-devices, domU wonât start, with an error message
> "device XX:XX.X need to be co-assigned with XX:XX.X, but it's not owned by
> pci-backend

Does ist work when you only delegate the one ethernet card directly
connected via PCI to a domU?

>
>
>
> The probleme is :Â even if my domU are configuer with 1 VCPUs for each of
> them, when domU acces to I/O devices, VCPUs aren't separated (I've notice
> this using virt-manager charts). During a basic CPU benchmark on a domU,
> VCPUs are isolated.

Can you elaborate on "when domU acces to I/O devices, VCPUs aren't
separated[..]"?

Regards, Linus

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