Hi,
I have been measuring the Ethernet speed of Jetson TX1 developement board and noticed some strange things.
In short, when I normally measure the speed, the result is about 650-800 Mbits/sec and not stable. But if I connect a mouse to the micro USB 2.0 connector, the Ethernet speed increases to 940 Mbits/sec, and becomes stable.
I am using iperf3 for measurement and tested both 32bit L4T24.1 and 64bit L4T24.2.1, but gives me the same result.
If mouse is NOT connected to micro USB 2.0:
iperf3 -c 192.168.1.86 -R
Connecting to host 192.168.1.86, port 5201
Reverse mode, remote host 192.168.1.86 is sending
[ 4] local 192.168.1.70 port 51603 connected to 192.168.1.86 port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 63.3 MBytes 531 Mbits/sec
[ 4] 1.00-2.00 sec 84.7 MBytes 711 Mbits/sec
[ 4] 2.00-3.00 sec 89.4 MBytes 750 Mbits/sec
[ 4] 3.00-4.00 sec 87.1 MBytes 730 Mbits/sec
[ 4] 4.00-5.00 sec 78.4 MBytes 657 Mbits/sec
[ 4] 5.00-6.00 sec 78.3 MBytes 658 Mbits/sec
[ 4] 6.00-7.00 sec 79.4 MBytes 666 Mbits/sec
[ 4] 7.00-8.00 sec 85.2 MBytes 715 Mbits/sec
[ 4] 8.00-9.00 sec 77.0 MBytes 645 Mbits/sec
[ 4] 9.00-10.00 sec 76.7 MBytes 643 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-10.00 sec 800 MBytes 671 Mbits/sec 0 sender
[ 4] 0.00-10.00 sec 800 MBytes 671 Mbits/sec receiver
iperf Done.
If mouse is connected to micro USB 2.0:
iperf3 -c 192.168.1.86 -R
Connecting to host 192.168.1.86, port 5201
Reverse mode, remote host 192.168.1.86 is sending
[ 4] local 192.168.1.70 port 51605 connected to 192.168.1.86 port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 102 MBytes 852 Mbits/sec
[ 4] 1.00-2.00 sec 112 MBytes 944 Mbits/sec
[ 4] 2.00-3.00 sec 113 MBytes 945 Mbits/sec
[ 4] 3.00-4.00 sec 113 MBytes 944 Mbits/sec
[ 4] 4.00-5.00 sec 113 MBytes 943 Mbits/sec
[ 4] 5.00-6.00 sec 113 MBytes 945 Mbits/sec
[ 4] 6.00-7.00 sec 113 MBytes 945 Mbits/sec
[ 4] 7.00-8.00 sec 113 MBytes 946 Mbits/sec
[ 4] 8.00-9.00 sec 113 MBytes 946 Mbits/sec
[ 4] 9.00-10.00 sec 113 MBytes 945 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-10.00 sec 1.09 GBytes 936 Mbits/sec 0 sender
[ 4] 0.00-10.00 sec 1.09 GBytes 936 Mbits/sec receiver
iperf Done.
I know that Ethernet controller and micro USB 2.0 port use the same USB controller of the TX1, but dont know why this problem is happening.
I would be very grateful, if someone could help me how to use Ethernet with full speed without connecting a device to the micro USB 2.0 port.
Thank you in advance!