Open Stack

On Wed, Aug 15, 2012 at 6:01 PM, Thomas Vachon <vachon at sessionm.com> wrote:

> On Wed, Aug 15, 2012 at 10:56 AM, Eugene Nelen <enelen at helioscloud.com>
> wrote:
> >
> >
> > 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.
> >
> >>
>
> I actually have tg3 loaded, not bnx2.  I just realized they are
> NetXtreme not II's
>
> 01:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5720
> Gigabit Ethernet PCIe
> 01:00.1 Ethernet controller: Broadcom Corporation NetXtreme BCM5720
> Gigabit Ethernet PCIe
> 02:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5720
> Gigabit Ethernet PCIe
> 02:00.1 Ethernet controller: Broadcom Corporation NetXtreme BCM5720
> Gigabit Ethernet PCIe
>
>
> Eugene, looking at that caveat, I couldn't find a "solution", did you see
> one?
>
No. For now I am not using vhost_net module/virtio for production VMs. I am
using realtek driver.
But performance is really bad.
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