PINE64
USB 2.0 OTG port slow performance - Printable Version

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+--- Thread: USB 2.0 OTG port slow performance (/showthread.php?tid=16869)

USB 2.0 OTG port slow performance - disctanger - 06-19-2022

I am working on https://wiki.pine64.org/wiki/PineCube#PineCube_as_a_webcam section of PineCube wiki.
I am trying to get USB 2.0 port  to reach maximum bandwidth with OTG port (Hi-Speed - 480 MegaBits/second) on PineCube device. Currently it is performing as Full-Speed (12.5 MegaBytes/second) usb port.



I have measured the speed and performance using iperf + g_ether kernel mod + OTG port (details below)


Official datasheet of PineCube (https://files.pine64.org/doc/datasheet/pinecube/S3_Datasheet_V1.1-20180123.pdf) tells that the port can perform up to 60 MegaBytes/second or 480 MegaBits/second.



UVC gadget (g_webcam module) is also performing at Full-Speed mode.


Code:
root@pinecube:~/uvs-gadget# iperf3 -c 192.168.10.5 -f M
Connecting to host 192.168.10.5, port 5201
[  5] local 192.168.10.2 port 38834 connected to 192.168.10.5 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  14.0 MBytes  14.0 MBytes/sec    0    133 KBytes      
[  5]   1.00-2.00   sec  12.9 MBytes  12.9 MBytes/sec    0    165 KBytes      
[  5]   2.00-3.01   sec  13.3 MBytes  13.3 MBytes/sec    0    165 KBytes      
[  5]   3.01-4.00   sec  13.7 MBytes  13.8 MBytes/sec    0    165 KBytes      
[  5]   4.00-5.00   sec  13.0 MBytes  13.0 MBytes/sec    0    175 KBytes      
[  5]   5.00-6.00   sec  13.6 MBytes  13.6 MBytes/sec    0    252 KBytes      
[  5]   6.00-7.00   sec  12.7 MBytes  12.7 MBytes/sec    0    252 KBytes      
[  5]   7.00-8.00   sec  12.6 MBytes  12.6 MBytes/sec    0    264 KBytes      
[  5]   8.00-9.00   sec  13.1 MBytes  13.1 MBytes/sec    0    431 KBytes      
[  5]   9.00-10.00  sec  12.9 MBytes  12.9 MBytes/sec    0    431 KBytes      
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec   132 MBytes  13.2 MBytes/sec    0             sender
[  5]   0.00-10.00  sec   131 MBytes  13.1 MBytes/sec                  receiver

iperf Done.



armbianmonitor tool output (detailed logs) : http://ix.io/40o2


My questions are:

  1. How can i reach high speed on USB 2.0 port. (probably too general)
  2. Could the issue be be related to USB drivers or Device Tree set up?