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Intel AC8265 simultaneous STA + AP performance issues

kevmo314
Beginner
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I have an Intel AC8265 wifi card that supports simultaneous AP/STA:

        valid interface combinations:
                 * #{ managed } <= 1, #{ AP, P2P-client, P2P-GO } <= 1, #{ P2P-device } <= 1,
                   total <= 3, #channels <= 2

I've configured my AP accordingly:

$ iw dev
phy#0
        Interface ctrl0
                ifindex 10
                wdev 0x3
                addr e8:84:a5:ea:3d:8e
                ssid ********
                type AP
                channel 1 (2412 MHz), width: 20 MHz, center1: 2412 MHz
                txpower 22.00 dBm
        Unnamed/non-netdev interface
                wdev 0x2
                addr e8:84:a5:ea:3d:8d
                type P2P-device
                txpower 0.00 dBm
        Interface wlan0
                ifindex 5
                wdev 0x1
                addr e8:84:a5:ea:3d:8c
                type managed
                channel 153 (5765 MHz), width: 80 MHz, center1: 5775 MHz
                txpower 22.00 dBm

The client wifi connection works great, however the AP connection seems to have some serious performance degradation issues. Running iperf3 through the AP shows some substantial drops in bandwidth periodically:

$ iperf3 -s
-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------
Accepted connection from 10.42.0.137, port 39156
[  5] local 10.42.0.1 port 5201 connected to 10.42.0.137 port 39158
[ ID] Interval           Transfer     Bandwidth
[  5]   0.00-1.00   sec  1.78 MBytes  14.9 Mbits/sec                  
[  5]   1.00-2.00   sec  1.80 MBytes  15.1 Mbits/sec                  
[  5]   2.00-3.00   sec  2.33 MBytes  19.5 Mbits/sec                  
[  5]   3.00-4.00   sec  1.65 MBytes  13.8 Mbits/sec                  
[  5]   4.00-5.00   sec  1.51 MBytes  12.7 Mbits/sec                  
[  5]   5.00-6.00   sec   997 KBytes  8.17 Mbits/sec   <-- bandwidth drop
[  5]   6.00-7.00   sec  1.05 MBytes  8.78 Mbits/sec                  
[  5]   7.00-8.00   sec   175 KBytes  1.44 Mbits/sec   <-- bandwidth drop     
[  5]   8.00-9.00   sec  2.19 MBytes  18.4 Mbits/sec                  
[  5]   9.00-10.00  sec  2.38 MBytes  20.0 Mbits/sec                  
[  5]  10.00-10.21  sec   635 KBytes  25.0 Mbits/sec                  
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth
[  5]   0.00-10.21  sec  0.00 Bytes  0.00 bits/sec                  sender
[  5]   0.00-10.21  sec  16.4 MBytes  13.5 Mbits/sec                  receiver

dmesg doesn't seem to report anything unusual and nothing weird in the kernel or syslogs either. I've tried setting 11n_disable=8 off another post I found, however the bandwidth drops persist.

Why might this be happening/what can I do to debug the bandwidth drops? I had thought it might be because it's sitting on channel 1.

$ sudo iw dev ctrl0 set freq 2442
command failed: Device or resource busy (-16)

I managed to set the channel with NetworkManager which helped a bit, but not much. Also, it seems that the quality only degrades if the other managed client is connected. If only the AP is running, it has no problem.

I also was not able to change the channel to 5GHz regardless of the state of the managed connection.

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DeividA_Intel
Employee
836 Views

Hello kevmo314,  


  

Thank you for posting on the Intel® communities. I am sorry to know that you are having issues with your Intel® Dual Band Wireless-AC 8265.  

  

In order to better assist you, please provide the following:  


1. Is this the original adapter that came pre-installed on your computer or did you change/install the adapter to this one?   

2. Is the Bluetooth working?   

3. Is this a laptop or desktop computer? 

4. Did you notice the issue after a system update? When did the issue start?

5. What is the brand and model name of your AP/modem?

6. Have you checked the issue with the AP manufacturer?

7. Does the issue happen with a different AP/modem?

8. What is the operating system install and the version?



Regards,  

Deivid A. 

Intel Customer Support Technician 


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kevmo314
Beginner
832 Views

1. Is this the original adapter that came pre-installed on your computer or did you change/install the adapter to this one? 

 

We are a installing the adapter onto a Jetson Nano developer kit.

  

2. Is the Bluetooth working?   

 

Yes, however it seems to have a lot of interference with the 2.4GHz band

 

3. Is this a laptop or desktop computer? 

 

It's a Jetson Nano single-board computer.

 

4. Did you notice the issue after a system update? When did the issue start?

 

The issue has always been present, we are running Ubuntu 18.04 as provided by NVIDIA.

 

5. What is the brand and model name of your AP/modem?

 

The issue surfaces with the AC8265 behaving as an AP, we have tried against various access points and various clients.

 

6. Have you checked the issue with the AP manufacturer?

 

N/A

 

7. Does the issue happen with a different AP/modem?

 

Yes

 

8. What is the operating system install and the version?

 

Ubuntu 18.04

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DeividA_Intel
Employee
811 Views

Hello kevmo314, 



Thanks for the confirmation. Before we continue further, I would like to confirm the following:


1. Have you checked with Nvidia to confirm that their system is fully compatible with the Intel® Dual Band Wireless-AC 8265?

2. Can you update Ubuntu to the latest version?


Also, I would like to let you know our support for Linux systems is a bit limited. You may find useful information in the following link:



Regards,  

Deivid A. 

Intel Customer Support Technician 


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DeividA_Intel
Employee
776 Views

Hello kevmo314, 


 

After checking your thread, I would like to know if you need further assistance. 


If so, please let me know. 



Regards,  

Deivid A.  

Intel Customer Support Technician  


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DeividA_Intel
Employee
745 Views

Hello kevmo314, 


 

I was checking your thread and see that we have not heard back from you.  


I’m going to close your post, but if you need further assistance, please do not hesitate to create a new thread. 



Regards,  

Deivid A.  

Intel Customer Support Technician  


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