openstack team mailing list archive

[Sam Stoelinga <sammiestoel@xxxxxxxxx>]

Libvirt usb passthrough also doesn't need this.


On Fri, May 17, 2013 at 1:29 PM, Matthew Thode <prometheanfire@xxxxxxxxxx>wrote:

> On 05/16/13 22:43, Blair Bethwaite wrote:
> > Hi all,
> >
> > We're running a KVM based OpenStack cloud. I recently realised we don't
> > have the IOMMU turned on in our hypervisors. All indications I know about
> > and can find suggest it's only really useful if you want guests accessing
> > host devices directly, e.g., PCI pass-through. But I wonder if there are
> > any other performance advantages to be gained...? Virtio, for one,
> doesn't
> > seem to use this/need this.
> >
> >
> >
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> No, it's generally only for device pass-through.
>
> --
> -- Matthew Thode (prometheanfire)
>
>
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>