Re: [ovs-discuss] OVS 2.8.1 changes the rates of data packets!

[Dawood Sajjadi]

just as an update, I found out a way to solve my problem, but not sure how
it causes it! I was trying to do hop-by-hop routing over a wireless mesh
network bt setting eth_dst field (Re-writing of Destination MAC).  In my
prior configuration, I was not re-writing the eth_src field at each router,
but in the new one (as follows), I added it into the action section of my
rule (at the controller):

 "actions":[
{
"type":"SET_FIELD",
"field": "eth_src",
"value": "04:f0:21:11:3d:78"
},
{
"type":"SET_FIELD",
"field": "eth_dst",
"value": "04:f0:21:11:3d:81"
},
{
"type":"OUTPUT",
"port": 2
}
]

After applying the updated rule, the throughput problem is solved. However,
I don't understand how it affects the end-to-end throughput of flows over
the bridge/network. any comment?


On Sat, Dec 9, 2017 at 3:59 PM, Dawood Sajjadi 
wrote:

> I didn't make any conclusion. I just stated whatever I have experienced
> and as I mentioned before since by removing the wireless interfaces from
> the bridge, there is no rate limitation problem, then (at least) OVS plays
> a role in this problem. Ben: may I know what do you suggest to deal with
> this problem?
>
> On Fri, Dec 8, 2017 at 7:44 PM, Ben Pfaff  wrote:
>
>> It seems like you're just jumping to conclusions here.  What have you
>> done to understand the situation?
>>
>> On Fri, Dec 08, 2017 at 05:59:57PM -0800, Dawood Sajjadi wrote:
>> > when I remove the wireless interfaces from the bridge, there is no
>> problem.
>> > However, as soon as adding the wireless interfaces to the bridge, the
>> > problem shows up. So, it seems OVS (at least) is a part of the problem.
>> >
>> > On Fri, Dec 8, 2017 at 5:55 PM, Ben Pfaff  wrote:
>> >
>> > > On December 8, 2017 5:53:44 PM PST, Dawood Sajjadi <
>> s.d.sajj...@gmail.com>
>> > > wrote:
>> > >>
>> > >> I created a bridge using OVS 2.8.1 in Ubuntu 14.04. The bridge
>> contains 4
>> > >> physical ports including one ethernet and three wireless ports. The
>> > >> ethernet port is connected to a laptop that generated dummy traffic
>> using
>> > >> Iperf. So, the ethernet port is used as the incoming port and the
>> generated
>> > >> traffic leaves the bridge through the wireless (as the outgoing)
>> ports. I
>> > >> used tcpdump to capture the traffic at the incoming and outgoing
>> ports of
>> > >> the bridge and I noticed that the volume of the outgoing traffic (at
>> the
>> > >> wireless ports) is by far lower than the amount of the incoming
>> traffic
>> > >> (from the ethernet port). It seems the OVS bridge drops/limits the
>> rate of
>> > >> outgoing packets. For instance, if the size of the captured traffic
>> using
>> > >> tcpdump at eth0 is 15 MB, the total size of the captured traffic on
>> > >> wireless ports is 3 MB!
>> > >>
>> > >> I didn't make any change in the default configuration of the OVS.
>> Also,
>> > >> to ensure that there is no predefined Queue/QoS policy at the
>> bridge, I
>> > >> used "ovs-vsctl --all destroy qos && ovs-vsctl --all destroy queue"
>> > >> command. However, the problem persists! Has anyone encountered such
>> an
>> > >> issue before? I really appreciate having your feedback. Thanks.
>> > >>
>> > >
>> > > OVS doesn't change data rates. You should try to figure out what's
>> going
>> > > on without making that assumption.
>> > >
>>
>
>
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Re: [ovs-discuss] OVS 2.8.1 changes the rates of data packets!

[Dawood Sajjadi]

I didn't make any conclusion. I just stated whatever I have experienced and
as I mentioned before since by removing the wireless interfaces from the
bridge, there is no rate limitation problem, then (at least) OVS plays a
role in this problem. Ben: may I know what do you suggest to deal with this
problem?

On Fri, Dec 8, 2017 at 7:44 PM, Ben Pfaff  wrote:

> It seems like you're just jumping to conclusions here.  What have you
> done to understand the situation?
>
> On Fri, Dec 08, 2017 at 05:59:57PM -0800, Dawood Sajjadi wrote:
> > when I remove the wireless interfaces from the bridge, there is no
> problem.
> > However, as soon as adding the wireless interfaces to the bridge, the
> > problem shows up. So, it seems OVS (at least) is a part of the problem.
> >
> > On Fri, Dec 8, 2017 at 5:55 PM, Ben Pfaff  wrote:
> >
> > > On December 8, 2017 5:53:44 PM PST, Dawood Sajjadi <
> s.d.sajj...@gmail.com>
> > > wrote:
> > >>
> > >> I created a bridge using OVS 2.8.1 in Ubuntu 14.04. The bridge
> contains 4
> > >> physical ports including one ethernet and three wireless ports. The
> > >> ethernet port is connected to a laptop that generated dummy traffic
> using
> > >> Iperf. So, the ethernet port is used as the incoming port and the
> generated
> > >> traffic leaves the bridge through the wireless (as the outgoing)
> ports. I
> > >> used tcpdump to capture the traffic at the incoming and outgoing
> ports of
> > >> the bridge and I noticed that the volume of the outgoing traffic (at
> the
> > >> wireless ports) is by far lower than the amount of the incoming
> traffic
> > >> (from the ethernet port). It seems the OVS bridge drops/limits the
> rate of
> > >> outgoing packets. For instance, if the size of the captured traffic
> using
> > >> tcpdump at eth0 is 15 MB, the total size of the captured traffic on
> > >> wireless ports is 3 MB!
> > >>
> > >> I didn't make any change in the default configuration of the OVS.
> Also,
> > >> to ensure that there is no predefined Queue/QoS policy at the bridge,
> I
> > >> used "ovs-vsctl --all destroy qos && ovs-vsctl --all destroy queue"
> > >> command. However, the problem persists! Has anyone encountered such an
> > >> issue before? I really appreciate having your feedback. Thanks.
> > >>
> > >
> > > OVS doesn't change data rates. You should try to figure out what's
> going
> > > on without making that assumption.
> > >
>
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Re: [ovs-discuss] OVS 2.8.1 changes the rates of data packets!

[Ben Pfaff]

It seems like you're just jumping to conclusions here.  What have you
done to understand the situation?

On Fri, Dec 08, 2017 at 05:59:57PM -0800, Dawood Sajjadi wrote:
> when I remove the wireless interfaces from the bridge, there is no problem.
> However, as soon as adding the wireless interfaces to the bridge, the
> problem shows up. So, it seems OVS (at least) is a part of the problem.
> 
> On Fri, Dec 8, 2017 at 5:55 PM, Ben Pfaff  wrote:
> 
> > On December 8, 2017 5:53:44 PM PST, Dawood Sajjadi 
> > wrote:
> >>
> >> I created a bridge using OVS 2.8.1 in Ubuntu 14.04. The bridge contains 4
> >> physical ports including one ethernet and three wireless ports. The
> >> ethernet port is connected to a laptop that generated dummy traffic using
> >> Iperf. So, the ethernet port is used as the incoming port and the generated
> >> traffic leaves the bridge through the wireless (as the outgoing) ports. I
> >> used tcpdump to capture the traffic at the incoming and outgoing ports of
> >> the bridge and I noticed that the volume of the outgoing traffic (at the
> >> wireless ports) is by far lower than the amount of the incoming traffic
> >> (from the ethernet port). It seems the OVS bridge drops/limits the rate of
> >> outgoing packets. For instance, if the size of the captured traffic using
> >> tcpdump at eth0 is 15 MB, the total size of the captured traffic on
> >> wireless ports is 3 MB!
> >>
> >> I didn't make any change in the default configuration of the OVS. Also,
> >> to ensure that there is no predefined Queue/QoS policy at the bridge, I
> >> used "ovs-vsctl --all destroy qos && ovs-vsctl --all destroy queue"
> >> command. However, the problem persists! Has anyone encountered such an
> >> issue before? I really appreciate having your feedback. Thanks.
> >>
> >
> > OVS doesn't change data rates. You should try to figure out what's going
> > on without making that assumption.
> >
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Re: [ovs-discuss] OVS 2.8.1 changes the rates of data packets!

[Dawood Sajjadi]

when I remove the wireless interfaces from the bridge, there is no problem.
However, as soon as adding the wireless interfaces to the bridge, the
problem shows up. So, it seems OVS (at least) is a part of the problem.

On Fri, Dec 8, 2017 at 5:55 PM, Ben Pfaff  wrote:

> On December 8, 2017 5:53:44 PM PST, Dawood Sajjadi 
> wrote:
>>
>> I created a bridge using OVS 2.8.1 in Ubuntu 14.04. The bridge contains 4
>> physical ports including one ethernet and three wireless ports. The
>> ethernet port is connected to a laptop that generated dummy traffic using
>> Iperf. So, the ethernet port is used as the incoming port and the generated
>> traffic leaves the bridge through the wireless (as the outgoing) ports. I
>> used tcpdump to capture the traffic at the incoming and outgoing ports of
>> the bridge and I noticed that the volume of the outgoing traffic (at the
>> wireless ports) is by far lower than the amount of the incoming traffic
>> (from the ethernet port). It seems the OVS bridge drops/limits the rate of
>> outgoing packets. For instance, if the size of the captured traffic using
>> tcpdump at eth0 is 15 MB, the total size of the captured traffic on
>> wireless ports is 3 MB!
>>
>> I didn't make any change in the default configuration of the OVS. Also,
>> to ensure that there is no predefined Queue/QoS policy at the bridge, I
>> used "ovs-vsctl --all destroy qos && ovs-vsctl --all destroy queue"
>> command. However, the problem persists! Has anyone encountered such an
>> issue before? I really appreciate having your feedback. Thanks.
>>
>
> OVS doesn't change data rates. You should try to figure out what's going
> on without making that assumption.
>
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Re: [ovs-discuss] OVS 2.8.1 changes the rates of data packets!

[Ben Pfaff]

On December 8, 2017 5:53:44 PM PST, Dawood Sajjadi  
wrote:
>I created a bridge using OVS 2.8.1 in Ubuntu 14.04. The bridge contains
>4
>physical ports including one ethernet and three wireless ports. The
>ethernet port is connected to a laptop that generated dummy traffic
>using
>Iperf. So, the ethernet port is used as the incoming port and the
>generated
>traffic leaves the bridge through the wireless (as the outgoing) ports.
>I
>used tcpdump to capture the traffic at the incoming and outgoing ports
>of
>the bridge and I noticed that the volume of the outgoing traffic (at
>the
>wireless ports) is by far lower than the amount of the incoming traffic
>(from the ethernet port). It seems the OVS bridge drops/limits the rate
>of
>outgoing packets. For instance, if the size of the captured traffic
>using
>tcpdump at eth0 is 15 MB, the total size of the captured traffic on
>wireless ports is 3 MB!
>
>I didn't make any change in the default configuration of the OVS. Also,
>to
>ensure that there is no predefined Queue/QoS policy at the bridge, I
>used
>"ovs-vsctl --all destroy qos && ovs-vsctl --all destroy queue" command.
>However, the problem persists! Has anyone encountered such an issue
>before?
>I really appreciate having your feedback. Thanks.

OVS doesn't change data rates. You should try to figure out what's going on 
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[ovs-discuss] OVS 2.8.1 changes the rates of data packets!

[Dawood Sajjadi]

I created a bridge using OVS 2.8.1 in Ubuntu 14.04. The bridge contains 4
physical ports including one ethernet and three wireless ports. The
ethernet port is connected to a laptop that generated dummy traffic using
Iperf. So, the ethernet port is used as the incoming port and the generated
traffic leaves the bridge through the wireless (as the outgoing) ports. I
used tcpdump to capture the traffic at the incoming and outgoing ports of
the bridge and I noticed that the volume of the outgoing traffic (at the
wireless ports) is by far lower than the amount of the incoming traffic
(from the ethernet port). It seems the OVS bridge drops/limits the rate of
outgoing packets. For instance, if the size of the captured traffic using
tcpdump at eth0 is 15 MB, the total size of the captured traffic on
wireless ports is 3 MB!

I didn't make any change in the default configuration of the OVS. Also, to
ensure that there is no predefined Queue/QoS policy at the bridge, I used
"ovs-vsctl --all destroy qos && ovs-vsctl --all destroy queue" command.
However, the problem persists! Has anyone encountered such an issue before?
I really appreciate having your feedback. Thanks.
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