[ovs-discuss] Libvirt "tc ingress qdisc" automatically removed by ovs vlan tag setting, how?

[Qiu Yu]

On Thu, Jul 18, 2013 at 12:15 AM, Ben Pfaff <blp at nicira.com> wrote:
> On Wed, Jul 17, 2013 at 6:06 AM, Qiu Yu <unicell at gmail.com> wrote:
>> After some digging in openvswitch code. My wild guess is that vlan tag
>> reconfiguring triggered iface_configure_qos (vswitchd/bridge.c), which
>> in turn called netdev_set_policing to reset ingress policing rate.
>> Although there's no ingress_policing_rate set in my case, existing
>> ingress qdisc still remove by default.
>
> The OVS database in general specifies state, not actions.  That is, if
> you set no ingress_policing_rate, then OVS takes that to mean that it
> should turn off ingress policing, so it does.

I see. So ingress policing managed outside of OVS, which is libvirt in
my case, is overridden (no ingress_policing_rate by default, means
turned off) by OVS.

My question, however, is there any workaround, to preserve or inherit
the ingress policing managed outside of OVS after vlan tagging the
device?

> I'm surprised that you actually find ingress policing useful.  Our
> experience is that it doesn't work well, regardless of how you
> configure it.

Well, I'm not aware of other software solution to achieve ingress
throttling purpose. :( For me, it is better than nothing. Any
alternative solution to share? :)

--
Qiu Yu