I have a PC with Asus USB-AC58 wireless adapter running Manjaro and a laptop running Ubuntu. Laptop has Intel Wi-Fi 6 AX201 wireless adapter with maximum speed of 2.4 Gbits/s (I suppose, it's a sum of 2.4 and 5 Ghz bands' speed), but my RT-AC65P router supports only ac standard with up to 1300 Mbits/s. All three devices work in 5GHz mode.
Here are some speed measurements:
- Downloading MS Visual Studio 2013.iso image - both device have download speed of ~11.3 MB/s (94.3 Mbits/s), according to Firefox. And 100 Mbit/s is internet provider's limit.
- iperf measurements:
PC server, laptop client:
# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 128 KByte (default)
------------------------------------------------------------
[ 4] local 192.168.50.100 port 5001 connected with 192.168.50.11 port 60118
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.2 sec 151 MBytes 124 Mbits/sec
Laptop server, PC client:
# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 128 KByte (default)
------------------------------------------------------------
[ 4] local 192.168.50.11 port 5001 connected with 192.168.50.100 port 43284
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.1 sec 252 MBytes 209 Mbits/sec
My expectation was to see 867 Mbits/s that allowed by AC58 adapter. Am I misunderstand something? And why is there a 75 Mbits/s difference when PC and laptop change server/client roles for iperf
?
Additionally, I have strange USB characteristics determined by Manjaro for Asrock B450 Steel Legend motherboard:
# lsusb -t
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 10000M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 480M
|__ Port 4: Dev 6, If 0, Class=Vendor Specific Class, Driver=rtl88x2bu, 480M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 10000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/10p, 480M
|__ Port 7: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
# lsusb -v -s 3:6
Bus 003 Device 006: ID 0b05:19aa ASUSTek Computer, Inc. ASUS USB-AC58 USB Wireless adapter
Couldn't open device, some information will be missing
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.10
...
It seems that Dev 6
at Port 4
(which should be Wi-Fi adapter as it uses rtl88x2bu
driver) uses USB2, however it's actually connected to USB3. My motherboard has only 2 USB2 hubs, and one of them is not connected at all, and second is connected to USB-mouse. All other USB ports should be USB3.1 gen1 or gen2. Anyway, my Wi-Fi speed doesn't reach even 480 MB/s, what is supported by USB2. My be there is a USB/chipset driver problem?