Arch Linux

fish_monster

Member

Registered: 2022-02-21

Posts: 15

Suddenly slow internet

My internet was working fine for the first few days I used Arch, but now it has gone down to about 20 Mbps download (it varies sometimes up to 60 Mbps, but never above that). I am dual booting Win11 and Arch and the internet works just fine on Windows. The problem concerns wifi, I do not know whether the problem persists if I connect via ethernet, as I don't have a possibility to try that out. I used netctl BTW, if that matters.

The output of ip a is

 wlo1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 28:7f:cf:08:bf:c9 brd ff:ff:ff:ff:ff:ff
    altname wlp0s20f3
    inet 109.202.221.115/24 brd 109.202.221.255 scope global dynamic noprefixroute wlo1
       valid_lft 1420sec preferred_lft 1420sec
    inet 109.202.221.105/24 brd 109.202.221.255 scope global secondary dynamic noprefixroute wlo1
       valid_lft 1434sec preferred_lft 1254sec
    inet6 2001:1620:2018:39:9410:b721:9b32:b846/64 scope global dynamic noprefixroute 
       valid_lft 2591996sec preferred_lft 604796sec
    inet6 fe80::e541:b1f3:2fa5:bdf1/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

and the output of lspci -vvv is

 00:14.3 Network controller: Intel Corporation Comet Lake PCH-LP CNVi WiFi
	DeviceName: WLAN
	Subsystem: Intel Corporation Wi-Fi 6 AX201 160MHz
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 16
	Region 0: Memory at b121c000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: <access denied>
	Kernel driver in use: iwlwifi
	Kernel modules: iwlwifi

and the output of iwconfig is

 wlo1      IEEE 802.11  ESSID:"WOKO"  
          Mode:Managed  Frequency:2.412 GHz  Access Point: 80:2A:A8:14:53:D3   
          Bit Rate=52 Mb/s   Tx-Power=22 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          Link Quality=55/70  Signal level=-55 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:14   Missed beacon:0

Does anyone have an idea how to fix this?

Last edited by fish_monster (2022-02-21 15:01:29)

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 77,060

Re: Suddenly slow internet

https://bbs.archlinux.org/viewtopic.php?id=266239 but 2412 is 20MHz only anyway.
https://bbs.archlinux.org/viewtopic.php?id=268402 didn't reply but the problem holds.
General iwlwifi related issue seems/might be TSO, https://bbs.archlinux.org/viewtopic.php … 5#p1939135

Lastly, are you using any BT devices (or did you introduce them)?

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fish_monster

Member

Registered: 2022-02-21

Posts: 15

Re: Suddenly slow internet

Lastly, are you using any BT devices (or did you introduce them)?

I added bluetooth (I assume that's what you mean by BT) devices after installation. But not in the brief period before the internet slowed down.

Edit: Windows fast-boot is disabled.

 sudo ethtool -K wlo1 tso off 

didn't help either.

Last edited by fish_monster (2022-02-21 16:08:51)