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On Wed, Aug 15, 2012 at 5:31 PM, Thomas Vachon <vachon at sessionm.com> wrote:

> On Wed, Aug 15, 2012 at 10:28 AM, Narayan Desai <narayan.desai at gmail.com>
> wrote:
> > On Wed, Aug 15, 2012 at 9:16 AM, Thomas Vachon <vachon at sessionm.com>
> wrote:
> >> On Wed, Aug 15, 2012 at 9:58 AM, Thomas Vachon <vachon at sessionm.com>
> wrote:
> >>> On Wed, Aug 15, 2012 at 8:54 AM, Thomas Vachon <vachon at sessionm.com>
> wrote:
> >>>>
> >>>> On Wed, Aug 15, 2012 at 8:53 AM, Narayan Desai <
> narayan.desai at gmail.com> wrote:
> >>>> > On Wed, Aug 15, 2012 at 7:24 AM, Thomas Vachon <vachon at sessionm.com>
> wrote:
> >>>> >
> >>>> >> I am also on Precise.  Downing/Up'ing the interface via VNC did
> work.
> >>>> >> How exactly did you setup vhost_net, can you provide your libvirt?
> >>>> >
> >>>> > Hm, that might mean that isn't the problem, but this is an easy
> enough
> >>>> > thing to check.
> >>>> >
> >>>> > Setting up vhost_net is pretty easy; it is auto-detected by kvm, so
> >>>> > all you need to do is modprobe it on the hypervisor.
> >>>> >  -nld
> >>>>
> >>>> Found the docs saying that.  It might help, I will report back on this
> >>>> thread when I run the tests in a bit
> >>>
> >>> OK, I lost all connectivity between nova-network and my vm's.  DNSMasq
> >>> is running and I added the vhost_net module (and confirmed libvirt
> >>> sees it).  Do I need to do something to the guests now too?
> >>
> >> I think I found the root bug:
> >> https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/997978
> >
> > Yeah, this is where i found the vhost_net workaround. (it seems to
> > work for some people and not for others, so I suspect the problem is
> > more complicated somehow)
> >  -nld
>
> The workaround of adding it?  When I added it, I lose all connectivity
> to the instances.
>

I can confirm it.
Instance can not get ip address from dnsmasq when vhost_net module is
loaded.
http://www.linux-kvm.org/page/VhostNet   see Caveats link.

When I use virtio for instances and vhost_net module is not loaded
my instances lose network connectivity.


>
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