Arch Linux

l3l00

Member

Registered: 2018-01-18

Posts: 38

Set up Netgear AC600 802.11ac usb plus NIC bandwidth slowly slows down

I guess I just do not understand the arch documentation: https://wiki.archlinux.org/index.php/Wi … figuration
Now before purchasing this USB adapter I did see an arch forum post mentioning they got this working. The most I did honestly was install the AUR of rtl88xxau (https://aur.archlinux.org/packages/rtl8 … -dkms-git/)
However, I guess I was supposed to do something else after installing. I just need more clarity I guess.

I know the computer does detect it:

$ lsusb
Bus 003 Device 007: ID 0846:9052 NetGear, Inc. A6100 AC600 DB Wireless Adapter [Realtek RTL8811AU]

About current NIC slowly slows down
Currently using a very cheap usb NIC called, "Kootek" mainly because it just worked right off the bat, didn't need to do anything to get it running. However
Every now and then the bandwidth speed depletes to KBs which I then have to turn NetworkManager off then on again to get the speed back.
How do I go about diagnosing what is going on when a NIC card does this so I would know how to debug and patch.

l3l00

Member

Registered: 2018-01-18

Posts: 38

Re: Set up Netgear AC600 802.11ac usb plus NIC bandwidth slowly slows down

update - Noticed wrong driver so attempted to install that (https://aur.archlinux.org/packages/rtl8821au-dkms-git/        - installed without issues)

# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp4s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether bc:5f:f4:ae:62:c6 brd ff:ff:ff:ff:ff:ff


$ dmesg | grep usbcore
[    0.756280] usbcore: registered new interface driver usbfs
[    0.756280] usbcore: registered new interface driver hub
[    0.756280] usbcore: registered new device driver usb
[    0.944568] usbcore: registered new interface driver usbserial_generic
[   11.704523] usbcore: registered new interface driver usbhid

# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp4s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether bc:5f:f4:ae:62:c6 brd ff:ff:ff:ff:ff:ff

# dmesg | grep iwlwifi
# dmesg | grep firmware
[  492.370059] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[  492.463201] rtl8192cu: Loading firmware rtlwifi/rtl8192cufw_TMSC.bin

# dmesg | grep usbcore
[    0.756280] usbcore: registered new interface driver usbfs
[    0.756280] usbcore: registered new interface driver hub
[    0.756280] usbcore: registered new device driver usb
[    0.944568] usbcore: registered new interface driver usbserial_generic
[   11.704523] usbcore: registered new interface driver usbhid
[  492.499508] usbcore: registered new interface driver rtl8192cu
[  492.566908] usbcore: registered new interface driver rtl8xxxu

# pacman -Syuu
Nothing to do

l3l00

Member

Registered: 2018-01-18

Posts: 38

Re: Set up Netgear AC600 802.11ac usb plus NIC bandwidth slowly slows down

$ dkms status
digimend-kernel-drivers, 9.r26.g9b3c2be, 4.20.0-arch1-1-ARCH, x86_64: installed (WARNING! Diff between built and installed module!) (WARNING! Diff between built and installed module!) (WARNING! Diff between built and installed module!) (WARNING! Diff between built and installed module!)
digimend-kernel-drivers, 9.r26.g9b3c2be, 4.20.3-arch1-1-ARCH, x86_64: installed (original_module exists)
digimend-kernel-drivers, 9.r26.g9b3c2be, 4.20.6-arch1-1-ARCH, x86_64: installed (original_module exists)
digimend, 8, 4.20.3-arch1-1-ARCH, x86_64: installed (WARNING! Diff between built and installed module!) (WARNING! Diff between built and installed module!) (WARNING! Diff between built and installed module!) (WARNING! Diff between built and installed module!)
digimend, 8, 4.20.4-arch1-1-ARCH, x86_64: installed (WARNING! Diff between built and installed module!) (WARNING! Diff between built and installed module!) (WARNING! Diff between built and installed module!) (WARNING! Diff between built and installed module!)
digimend, 8, 4.20.6-arch1-1-ARCH, x86_64: installed (WARNING! Diff between built and installed module!) (WARNING! Diff between built and installed module!) (WARNING! Diff between built and installed module!) (WARNING! Diff between built and installed module!)
rtl8821au, 5.1.5.r74.g30fb964, 4.20.6-arch1-1-ARCH, x86_64: installed
vboxsf, 6.0.4_OSE, 4.20.6-arch1-1-ARCH, x86_64: installed

It shows that the driver did install successfully (rtl8821au)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 21,645

Re: Set up Netgear AC600 802.11ac usb plus NIC bandwidth slowly slows down

Well is any of these drivers actually being used? check lspci -k and/or dmesg if any events register there when you get to your slowdowns, FWIW these are out of tree /staging drivers because they aren't yet entirely up to snuff, so you could well see issues in the drivers.

From the small output we have it looks like the "wrong" driver is loaded, you might've to blacklist it so that the driver you installed is loaded as opposed to the one already in the kernel.

In the future, please edit your original post and don't bump your thread each time a new thought occurs to you.