2018-03-22 20:11 GMT+03:00 Bin Liu <b-...@ti.com>:
> On Thu, Mar 22, 2018 at 07:31:59PM +0300, Matwey V. Kornilov wrote:
>> Hi,
>>
>> I am running 4.16-rc6 and see the following issue with ASIX
>> usb-ethernet dongle running on BeagleBoneBlack (TI AM335x).
>
> Does the issue also happen on older kernels?
>
>> My device is 100Mbps USB 2.0 dongle (ASIX AX88772 USB 2.0 Ethernet
>> idVendor=0b95, idProduct=7720). I've also tried 1Gbps USB 3.0 ASIX
>> dongle, that shows the same behavior.
>>
>> When I start iperf server on the host, and start remote client in UDP
>> (iperf3 -c ip -b 100M -u). The following I see at BeagleBoneBlack
>> side.
>
> If this is not a regression in v4.16, please try with lower '-b', musb
> rx is kinda slow right now.
>
>>
>> -----------------------------------------------------------
>> Server listening on 5201
>> -----------------------------------------------------------
>> Accepted connection from 192.168.185.4, port 38624
>> [  5] local 192.168.185.218 port 5201 connected to 192.168.185.4 port 38088
>> [ ID] Interval           Transfer     Bitrate         Jitter
>> Lost/Total Datagrams
>> [  5]   0.00-12.09  sec  1.33 MBytes   921 Kbits/sec  1742978.415 ms
>> 317/487 (65%)
>> [  5]  12.10-13.00  sec  24.0 KBytes   218 Kbits/sec  1436810.214 ms  0/3 
>> (0%)
>> [  5]  13.00-13.37  sec  0.00 Bytes  0.00 bits/sec  1436810.214 ms  0/0 (0%)
>> - - - - - - - - - - - - - - - - - - - - - - - - -
>> [ ID] Interval           Transfer     Bitrate         Jitter
>> Lost/Total Datagrams
>> [  5]   0.00-13.37  sec  1.35 MBytes   848 Kbits/sec  1436810.214 ms
>> 317/490 (65%)  receiver
>> -----------------------------------------------------------
>> Server listening on 5201
>> -----------------------------------------------------------
>
> I will try to reproduce it when I get some time.

I've just found that the issue depends on cpufreq governor. For me it
appears when ondemand is used.

>
>> Kernel config is attached here.
>>
>> --
>> With best regards,
>> Matwey V. Kornilov
>
> Regards,
> -Bin.



-- 
With best regards,
Matwey V. Kornilov
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