I have an ODroid N2 (not plus) and last year I got a new wireless NIC to try to improve transfer speeds. I read that the T3U Plus was a supported 802.11ac model so I got that.
However, when I was transferring files I realized that it was really slow. The router is in the same room as the TV, maybe 8 feet or so away, and it looks like it’s getting full 867 Mbps PHY speed.
CoreELEC:~ # iwconfig
wlan0 IEEE 802.11AC ESSID:"******" Nickname:"<WIFI@REALTEK>"
Mode:Managed Frequency:5.785 GHz Access Point: 70:03:7E:10:95:B3
Bit Rate:867 Mb/s Sensitivity:0/0
Retry:off RTS thr:off Fragment thr:off
Encryption key:****-****-****-****-****-****-****-**** Security mode:open
Power Management:off
Link Quality=85/100 Signal level=-30 dBm Noise level=0 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
I tried all four USB ports, and iperf3 was reporting something like 100Mbps maximum however.
➜ ~ iperf3 -c 10.0.0.205 -p 5201 -u -b 1000m -i 10 -t 60
Connecting to host 10.0.0.205, port 5201
[ 5] local 10.0.0.55 port 57088 connected to 10.0.0.205 port 5201
[ ID] Interval Transfer Bitrate Total Datagrams
[ 5] 0.00-10.00 sec 284 MBytes 238 Mbits/sec 2199941
[ 5] 10.00-20.00 sec 240 MBytes 201 Mbits/sec 1772235
[ 5] 20.00-30.00 sec 234 MBytes 197 Mbits/sec 1856899
[ 5] 30.00-40.00 sec 231 MBytes 193 Mbits/sec 1804758
[ 5] 40.00-50.00 sec 224 MBytes 188 Mbits/sec 1685979
[ 5] 50.00-60.00 sec 239 MBytes 201 Mbits/sec 1740226
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-60.00 sec 1.42 GBytes 203 Mbits/sec 0.000 ms 0/11060038 (0%) sender
[ 5] 0.00-60.49 sec 762 MBytes 106 Mbits/sec 0.036 ms 10394885/10946883 (95%) receiver
So I looked at the lshw ooutput and it looks like no matter which USB port I use, it always downgrades the USB to USB 2.1
*-usbhost:0
product: xHCI Host Controller
vendor: Linux 4.9.269 xhci-hcd
physical id: 1
bus info: usb@1
logical name: usb1
version: 4.09
capabilities: usb-2.00
configuration: driver=hub slots=2 speed=480Mbit/s
*-usb
description: USB hub
product: USB2.1 Hub
vendor: GenesysLogic
physical id: 1
bus info: usb@1:1
version: 93.04
capabilities: usb-2.10
configuration: driver=hub maxpower=100mA slots=4 speed=480Mbit/s
*-usb
description: Generic USB device
product: 802.11ac NIC
vendor: Realtek
physical id: 4
bus info: usb@1:1.4
version: 2.10
serial: 123456
capabilities: usb-2.10
configuration: driver=rtl88x2bu maxpower=500mA speed=480Mbit/s
*-usbhost:1
product: xHCI Host Controller
vendor: Linux 4.9.269 xhci-hcd
physical id: 2
bus info: usb@2
logical name: usb2
version: 4.09
capabilities: usb-3.00
configuration: driver=hub slots=1 speed=5000Mbit/s
*-usb
description: USB hub
product: USB3.1 Hub
vendor: GenesysLogic
physical id: 1
bus info: usb@2:1
version: 93.04
capabilities: usb-3.10
configuration: driver=hub slots=4 speed=5000Mbit/s
Could this be a driver issue? Or if it’s hardware does anyone else have a suggestion for a different 802.11ac NIC to use?
