[Openstack-operators] Problem with Heavy Network IO and Dnsmasq

Thomas Vachon vachon at sessionm.com
Wed Aug 15 14:31:39 UTC 2012


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.



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