UDP throughput problems with WDS and ath10k

UDP throughput problems with WDS and ath10k

[Xue Liu]

Hello everyone,

Now I am doing point to point  throughput test using  and ath10k. The 
hardwares are clearfog A1 board with armada 388 and WLE900VX (QCA9880). 
The OpenWRT trunk is running on it.

At first I did UDP throughput test ( WDS AP <---> WDS Client ) with 
iperf3 server on the WDS AP. The throughput is approx 630 Mbps.  But if 
the server sends the data, the throughput will rise to 700 Mbps.  I did 
the bidirectional test for many times. The UDP data transferring from AP 
side always has 70 - 80 Mbps more throughput.

In the same situation, I did UDP throughput test between PC and WDS AP ( 
PC <---->WDS Client <----> WDS AP ) . The PC is connected with the WDS 
client via GbE port.  I have found a more interesting result. The data 
throughput is about 678 Mbps when the data is transmitted from AP to PC. 
There is almost no performance loss. But the throughput is only about 
425 Mpbs from PC to AP.

Can anyone give me some advises or some info about the reason and how to 
improve the transmitting performance from PC to AP side. Thank you.

Regards,

Xue Liu

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Re: UDP throughput problems with WDS and ath10k

[Michal Kazior]

On 23 March 2016 at 11:53, Xue Liu <xue.liu@dks-koeln.de> wrote:
> Hello everyone,
>
> Now I am doing point to point  throughput test using  and ath10k. The
> hardwares are clearfog A1 board with armada 388 and WLE900VX (QCA9880). The
> OpenWRT trunk is running on it.
>
> At first I did UDP throughput test ( WDS AP <---> WDS Client ) with iperf3
> server on the WDS AP. The throughput is approx 630 Mbps.  But if the server
> sends the data, the throughput will rise to 700 Mbps.  I did the
> bidirectional test for many times. The UDP data transferring from AP side
> always has 70 - 80 Mbps more throughput.
>
> In the same situation, I did UDP throughput test between PC and WDS AP ( PC
> <---->WDS Client <----> WDS AP ) . The PC is connected with the WDS client
> via GbE port.  I have found a more interesting result. The data throughput
> is about 678 Mbps when the data is transmitted from AP to PC. There is
> almost no performance loss. But the throughput is only about 425 Mpbs from
> PC to AP.
>
> Can anyone give me some advises or some info about the reason and how to
> improve the transmitting performance from PC to AP side. Thank you.

This is weird. Did you check CPU utilization on all involved devices
(PC, WDS Client, WDS AP)? Did you try tweaking iperf parameters, e.g.
number of threads, buffer sizes? Playing around with some parameters
could narrow down the problem.

Normally I would expect the reverse performance drop (i.e. slower
performance when traffic is generated locally on WDS Client).


Michał

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Re: UDP throughput problems with WDS and ath10k

[Ben Greear]

On 03/23/2016 09:54 AM, Michal Kazior wrote:
> On 23 March 2016 at 11:53, Xue Liu <xue.liu@dks-koeln.de> wrote:
>> Hello everyone,
>>
>> Now I am doing point to point  throughput test using  and ath10k. The
>> hardwares are clearfog A1 board with armada 388 and WLE900VX (QCA9880). The
>> OpenWRT trunk is running on it.
>>
>> At first I did UDP throughput test ( WDS AP <---> WDS Client ) with iperf3
>> server on the WDS AP. The throughput is approx 630 Mbps.  But if the server
>> sends the data, the throughput will rise to 700 Mbps.  I did the
>> bidirectional test for many times. The UDP data transferring from AP side
>> always has 70 - 80 Mbps more throughput.
>>
>> In the same situation, I did UDP throughput test between PC and WDS AP ( PC
>> <---->WDS Client <----> WDS AP ) . The PC is connected with the WDS client
>> via GbE port.  I have found a more interesting result. The data throughput
>> is about 678 Mbps when the data is transmitted from AP to PC. There is
>> almost no performance loss. But the throughput is only about 425 Mpbs from
>> PC to AP.
>>
>> Can anyone give me some advises or some info about the reason and how to
>> improve the transmitting performance from PC to AP side. Thank you.
>
> This is weird. Did you check CPU utilization on all involved devices
> (PC, WDS Client, WDS AP)? Did you try tweaking iperf parameters, e.g.
> number of threads, buffer sizes? Playing around with some parameters
> could narrow down the problem.
>
> Normally I would expect the reverse performance drop (i.e. slower
> performance when traffic is generated locally on WDS Client).

I don't know about WDS, but we definitely see slower upload (from station perspective)
than download rates, using identical hardware for AP and STA devices.

Patches posted to ath10k list yesterday claim to resolve at least some of this,
but I have not tested those yet...

Thanks,
Ben


-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com


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Re: UDP throughput problems with WDS and ath10k

[Xue Liu]

Hello,

I have test throughput with different 3  parameters. But the results are 
similar. The data rate from PC via  Client to the AP decreases 
significantly comparing with the reverse direction.

During the test I also obverse the CPU load of client and AP. When the 
data is sent from PC, the AP has ~2% CPU load, ~63 nic and ~25% sirq. 
The client has ~0% CPU load ~78% nic and ~20% sirq. When the data sent 
from AP, the AP has ~1% cpu ~69% nic and 7% sirq. The client has ~0% 
cpu, 76% nic and ~24% sirq.

The test diagram is shown as

PC(GbE) --- (GbE)WDS Client (Wireless) --- (Wireless) WDS AP.

Did anyone else tries with such setup ?


On 23/03/16 18:20, Ben Greear wrote:
> On 03/23/2016 09:54 AM, Michal Kazior wrote:
>> On 23 March 2016 at 11:53, Xue Liu <xue.liu@dks-koeln.de> wrote:
>>> Hello everyone,
>>>
>>> Now I am doing point to point  throughput test using  and ath10k. The
>>> hardwares are clearfog A1 board with armada 388 and WLE900VX 
>>> (QCA9880). The
>>> OpenWRT trunk is running on it.
>>>
>>> At first I did UDP throughput test ( WDS AP <---> WDS Client ) with 
>>> iperf3
>>> server on the WDS AP. The throughput is approx 630 Mbps.  But if the 
>>> server
>>> sends the data, the throughput will rise to 700 Mbps.  I did the
>>> bidirectional test for many times. The UDP data transferring from AP 
>>> side
>>> always has 70 - 80 Mbps more throughput.
>>>
>>> In the same situation, I did UDP throughput test between PC and WDS 
>>> AP ( PC
>>> <---->WDS Client <----> WDS AP ) . The PC is connected with the WDS 
>>> client
>>> via GbE port.  I have found a more interesting result. The data 
>>> throughput
>>> is about 678 Mbps when the data is transmitted from AP to PC. There is
>>> almost no performance loss. But the throughput is only about 425 
>>> Mpbs from
>>> PC to AP.
>>>
>>> Can anyone give me some advises or some info about the reason and 
>>> how to
>>> improve the transmitting performance from PC to AP side. Thank you.
>>
>> This is weird. Did you check CPU utilization on all involved devices
>> (PC, WDS Client, WDS AP)? Did you try tweaking iperf parameters, e.g.
>> number of threads, buffer sizes? Playing around with some parameters
>> could narrow down the problem.
>>
>> Normally I would expect the reverse performance drop (i.e. slower
>> performance when traffic is generated locally on WDS Client).
>
> I don't know about WDS, but we definitely see slower upload (from 
> station perspective)
> than download rates, using identical hardware for AP and STA devices.
>
> Patches posted to ath10k list yesterday claim to resolve at least some 
> of this,
> but I have not tested those yet...
>
> Thanks,
> Ben
>
>


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Re: UDP throughput problems with WDS and ath10k

[Xue Liu]

Sorry. I think I misunderstand the info from "top". I will correct my 
result as below:

When the data is sent from PC to AP, the AP has
CPU:   1%    9% sys   0% nic  61% idle   0% io   0% irq  27% sirq
Load average: 0.54 0.46 0.36 2/53 5034

And the client has
CPU:   0% usr   0% sys   0% nic  73% idle   0% io   0% irq  26% sirq
Load average: 0.00 0.01 0.02 1/53 1228

When the data is sent from AP to PC, the AP has
CPU:   1% usr  21% sys   0% nic  70% idle   0% io   0% irq   6% sirq
Load average: 0.79 0.62 0.44 2/53 5282

And the client has
CPU:   0% usr   0% sys   0% nic  74% idle   0% io   0% irq  25% sirq
Load average: 0.00 0.01 0.02 1/53 1228


On 31/03/16 16:36, Xue Liu wrote:
> Hello,
>
> I have test throughput with different 3  parameters. But the results 
> are similar. The data rate from PC via  Client to the AP decreases 
> significantly comparing with the reverse direction.
>
> During the test I also obverse the CPU load of client and AP. C, the 
> AP has ~2% CPU load, ~63 nic and ~25% sirq. The client has ~0% CPU 
> load ~78% nic and ~20% sirq. When the data sent from AP, the AP has 
> ~1% cpu ~69% nic and 7% sirq. The client has ~0% cpu, 76% nic and ~24% 
> sirq.
>
> The test diagram is shown as
>
> PC(GbE) --- (GbE)WDS Client (Wireless) --- (Wireless) WDS AP.
>
> Did anyone else tries with such setup ?
>
>
> On 23/03/16 18:20, Ben Greear wrote:
>> On 03/23/2016 09:54 AM, Michal Kazior wrote:
>>> On 23 March 2016 at 11:53, Xue Liu <xue.liu@dks-koeln.de> wrote:
>>>> Hello everyone,
>>>>
>>>> Now I am doing point to point  throughput test using  and ath10k. The
>>>> hardwares are clearfog A1 board with armada 388 and WLE900VX 
>>>> (QCA9880). The
>>>> OpenWRT trunk is running on it.
>>>>
>>>> At first I did UDP throughput test ( WDS AP <---> WDS Client ) with 
>>>> iperf3
>>>> server on the WDS AP. The throughput is approx 630 Mbps. But if the 
>>>> server
>>>> sends the data, the throughput will rise to 700 Mbps.  I did the
>>>> bidirectional test for many times. The UDP data transferring from 
>>>> AP side
>>>> always has 70 - 80 Mbps more throughput.
>>>>
>>>> In the same situation, I did UDP throughput test between PC and WDS 
>>>> AP ( PC
>>>> <---->WDS Client <----> WDS AP ) . The PC is connected with the WDS 
>>>> client
>>>> via GbE port.  I have found a more interesting result. The data 
>>>> throughput
>>>> is about 678 Mbps when the data is transmitted from AP to PC. There is
>>>> almost no performance loss. But the throughput is only about 425 
>>>> Mpbs from
>>>> PC to AP.
>>>>
>>>> Can anyone give me some advises or some info about the reason and 
>>>> how to
>>>> improve the transmitting performance from PC to AP side. Thank you.
>>>
>>> This is weird. Did you check CPU utilization on all involved devices
>>> (PC, WDS Client, WDS AP)? Did you try tweaking iperf parameters, e.g.
>>> number of threads, buffer sizes? Playing around with some parameters
>>> could narrow down the problem.
>>>
>>> Normally I would expect the reverse performance drop (i.e. slower
>>> performance when traffic is generated locally on WDS Client).
>>
>> I don't know about WDS, but we definitely see slower upload (from 
>> station perspective)
>> than download rates, using identical hardware for AP and STA devices.
>>
>> Patches posted to ath10k list yesterday claim to resolve at least 
>> some of this,
>> but I have not tested those yet...
>>
>> Thanks,
>> Ben
>>
>>
>
>
> _______________________________________________
> ath10k mailing list
> ath10k@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/ath10k
>


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Re: UDP throughput problems with WDS and ath10k

[Bruno Antunes]

Hello,


On 23 March 2016 at 10:53, Xue Liu <xue.liu@dks-koeln.de> wrote:
> Hello everyone,
>
> Now I am doing point to point  throughput test using  and ath10k. The
> hardwares are clearfog A1 board with armada 388 and WLE900VX (QCA9880). The
> OpenWRT trunk is running on it.

Could you tell what is the OpenWrt Release and firmware used?
I'm using trunk R49886 and tried several versions of firmware and stll
can't send traffic trough the WDS link.
The link is established, there is a wlan0.sta1, but there is no L3 traffic.

Thanks,
Bruno

>
> At first I did UDP throughput test ( WDS AP <---> WDS Client ) with iperf3
> server on the WDS AP. The throughput is approx 630 Mbps.  But if the server
> sends the data, the throughput will rise to 700 Mbps.  I did the
> bidirectional test for many times. The UDP data transferring from AP side
> always has 70 - 80 Mbps more throughput.
>
> In the same situation, I did UDP throughput test between PC and WDS AP ( PC
> <---->WDS Client <----> WDS AP ) . The PC is connected with the WDS client
> via GbE port.  I have found a more interesting result. The data throughput
> is about 678 Mbps when the data is transmitted from AP to PC. There is
> almost no performance loss. But the throughput is only about 425 Mpbs from
> PC to AP.
>
> Can anyone give me some advises or some info about the reason and how to
> improve the transmitting performance from PC to AP side. Thank you.
>
> Regards,
>
> Xue Liu
>
> _______________________________________________
> ath10k mailing list
> ath10k@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/ath10k

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