On Tue, Jun 23, 2015 at 10:45:16AM -0700, Ben Pfaff wrote:
> On Thu, Jun 18, 2015 at 02:19:40PM +0000, Stokes, Ian wrote:
> > Hi All,
> >
> > I have been experimenting with Openvswitch and QoS. I have a question
> > regarding how an existing QoS configuration on a port is removed.
> >
> > I setup QoS on an existing port with the following command
> >
> > sudo ovs-vsctl -- set Port $IF_NAME qos=@newqos -- \
> > --id=@newqos create QoS type=linux-htb other-config:max-rate=4000000
> > queues=0=@q0 -- \
> > --id=@q0 create Queue other-config:min-rate=4000000
> > other-config:max-rate=4000000
> >
> > This gives me the _uuid of both the QoS and Queue entry
> >
> > 0b62cfb0-c335-45ca-8910-ca4030ea13af
> > 24ff16d8-926e-4c12-aad8-b7b06c6ec575
> >
> > When I send traffic I can see that QoS is indeed configured.
> >
> > I then remove the QoS configuration on the port with the following command
> >
> > sudo ovs-vsctl clear Port $IF_NAME qos
> >
> > I can see that QoS is no longer active on the port as the throughput is no
> > longer being limited.
> >
> > However when I check the database to see if QoS has been removed the QoS
> > table entry is still present along with the queue entry.
> >
> > sudo ovs-vsctl list qos
> > _uuid : 0b62cfb0-c335-45ca-8910-ca4030ea13af
> > external_ids : {}
> > other_config : {max-rate="4000000"}
> > queues : {0=24ff16d8-926e-4c12-aad8-b7b06c6ec575}
> > type : linux-htb
> >
> > To remove these entries I have to complete an additional step as follows
> > for both QoS and queue
> >
> > sudo ovs-vsctl -- destroy qos 0b62cfb0-c335-45ca-8910-ca4030ea13af
> > sudo ovs-vsctl -- destroy queue 24ff16d8-926e-4c12-aad8-b7b06c6ec575
> >
> > Previously I assumed that clearing QoS from the port with my first command
> > would automatically clear the database QoS entry as well but it would seem
> > that this is not the case. Is this behavior expected?
> >
> > I have also seen similar behavior if I destroy the QoS record first.
> > Although the record will no longer be in the database it seems that the
> > port is still configured for QoS until I call clear Port $IF_NAME qos.
> >
> > Appreciate any insight on this.
>
> This behavior is documented in ovs-ofctl(8). Search for "QoS" and
> you'll find explanations and examples.
Excuse me, that's ovs-vsctl(8).
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