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List:       openvswitch-discuss
Subject:    [ovs-discuss] QoS removal from port and database
From:       blp () nicira ! com (Ben Pfaff)
Date:       2015-06-23 17:45:36
Message-ID: 20150623174536.GF2640 () nicira ! com
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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 I can see that QoS is no longer active on the port as the throughput is no longer \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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