Slow WiFi speed on QC9377

Fri Jan 10 02:43:24 PST 2025

Hi everyone,

it seems that this is not a ath10k firmware issue but rather a kernel issue. I tried following:

Live boot newest Manjaro: Problem

Live boot Ubuntu 18.04: Full WiFi speed as expected

Live boot Ubuntu 20.04: Problem

Ubuntu 18.04 had kernel 5.4.0-84 and WLAN.TF.2.1-00021-QCARMSWP api 6 - no problem.

Ubuntu 20.04 had same firmware but kernel 5.15 - problem. I am gonna try to downgrade the kernel and see if that fixes my problem.

On Thursday, January 9th, 2025 at 7:39 PM, smaxxx <smaxxx at protonmail.com> wrote:

> Problem
> 
> I have slow WiFi speed on my Lenovo Ideapad C340-15IWL notebook running Ubuntu 24.04.1 LTS.
> 
> I reach about 30-40 Mbit/s and experience packet loss as soon as I hit that limit. It seems that this is the overall max throughput.
> How I measure
> 
> To make the tests more meaningful, I am running a iperf3 server on my local PC, that is connected to the same router per Ethernet (1 Gbit/s).
> 
> iperf3 -c 192.168.2.182
> Connecting to host 192.168.2.182, port 5201
> [ 5] local 192.168.2.111 port 54734 connected to 192.168.2.182 port 5201
> [ ID] Interval Transfer Bitrate Retr Cwnd
> [ 5] 0.00-1.00 sec 3.00 MBytes 25.1 Mbits/sec 0 97.0 KBytes
> [ 5] 1.00-2.00 sec 3.25 MBytes 27.3 Mbits/sec 0 103 KBytes
> [ 5] 2.00-3.00 sec 3.38 MBytes 28.3 Mbits/sec 0 113 KBytes
> [ 5] 3.00-4.00 sec 3.75 MBytes 31.5 Mbits/sec 0 164 KBytes
> [ 5] 4.00-5.00 sec 3.38 MBytes 28.3 Mbits/sec 0 188 KBytes
> [ 5] 5.00-6.00 sec 2.88 MBytes 24.1 Mbits/sec 0 188 KBytes
> [ 5] 6.00-7.00 sec 3.75 MBytes 31.5 Mbits/sec 0 188 KBytes
> [ 5] 7.00-8.00 sec 3.38 MBytes 28.3 Mbits/sec 0 147 KBytes
> [ 5] 8.00-9.00 sec 3.25 MBytes 27.3 Mbits/sec 0 164 KBytes
> [ 5] 9.00-10.00 sec 3.38 MBytes 28.3 Mbits/sec 0 182 KBytes
> - - - - - - - - - - - - - - - - - - - - - - - - -
> [ ID] Interval Transfer Bitrate Retr
> [ 5] 0.00-10.00 sec 33.4 MBytes 28.0 Mbits/sec 0 sender
> [ 5] 0.00-10.03 sec 32.8 MBytes 27.4 Mbits/sec receiver
> 
> My system and more info about my WiFi connection
> 
> I am connected via 5 GHz and the router is basically 4 meters away with no obstacles in front of it. The same issue exists with 2.4 GHz.
> Kernel / OS version
> 
> # cat /etc/os-release
> 
> PRETTY_NAME="Ubuntu 24.04.1 LTS"
> NAME="Ubuntu"
> VERSION_ID="24.04"
> VERSION="24.04.1 LTS (Noble Numbat)"
> VERSION_CODENAME=noble
> ID=ubuntu
> ID_LIKE=debian
> HOME_URL="https://www.ubuntu.com/"
> SUPPORT_URL="https://help.ubuntu.com/"
> BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
> PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
> UBUNTU_CODENAME=noble
> LOGO=ubuntu-logo
> 
> # uname -a
> Linux laptop 6.8.0-51-generic #52-Ubuntu SMP PREEMPT_DYNAMIC Thu Dec 5 13:09:44 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
> 
> # lspci
> [...]
> 02:00.0 Network controller: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter (rev 31)
> [...]
> 
> iwconfig
> 
> # iwconfig (sensitive data redacted)
> 
> wlp2s0 IEEE 802.11 ESSID:"My WiFI SSID"
> Mode:Managed Frequency:5.5 GHz Access Point: AA:BB:CC:DD:EE:FF
> Tx-Power=23 dBm
> Retry short limit:7 RTS thr:off Fragment thr:off
> Encryption key:off
> Power Management:off
> Link Quality=67/70 Signal level=-43 dBm
> Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
> Tx excessive retries:0 Invalid misc:37 Missed beacon:0
> 
> ncmli device wifi list
> 
> # mcli device wifi list
> IN-USE BSSID SSID MODE CHAN RATE SIGNAL BARS SECURITY
> * AA:BB:CC:DD:EE:FF My WiFi SSID Infra 100 540 Mbit/s 97 ▂▄▆█ WPA2 WPA3
> 
> dmesg | grep ath10k
> 
> [ 4.182676] ath10k_pci 0000:02:00.0: pci irq msi oper_irq_mode 2 irq_mode 0 reset_mode 0
> [ 4.400376] ath10k_pci 0000:02:00.0: qca9377 hw1.1 target 0x05020001 chip_id 0x003821ff sub 17aa:0901
> [ 4.400382] ath10k_pci 0000:02:00.0: kconfig debug 0 debugfs 1 tracing 1 dfs 0 testmode 0
> [ 4.400767] ath10k_pci 0000:02:00.0: firmware ver WLAN.TF.1.0-00002-QCATFSWPZ-5 api 5 features ignore-otp crc32 c3e0d04f
> [ 4.463619] ath10k_pci 0000:02:00.0: board_file api 2 bmi_id N/A crc32 8aedfa4a
> [ 4.556609] ath10k_pci 0000:02:00.0: htt-ver 3.44 wmi-op 4 htt-op 3 cal otp max-sta 32 raw 0 hwcrypto 1
> [ 4.620003] ath10k_pci 0000:02:00.0 wlp2s0: renamed from wlan0
> 
> What I tried
> 
> I disabled bluetooth. Issue persists.
> 
> I disabled power management. Issue persists.
> 
> I reinstalled the package "linux-firmware". Issue persists.
> 
> I disabled IPv6. Issue persists.
> 
> I changed the ath10k firmware from 6 to 5 and vice versa. Issue persists:
> 
> :/lib/firmware/ath10k/QCA9377/hw1.0# ls -la
> total 896
> drwxr-xr-x 2 root root 4096 Jan 9 19:35 .
> drwxr-xr-x 3 root root 4096 Apr 25 2024 ..
> -rw-r--r-- 1 root root 2737 Nov 29 11:50 board-2.bin.zst
> -rw-r--r-- 1 root root 1215 Nov 29 11:50 board.bin.zst
> -rw-r--r-- 1 root root 498888 Nov 29 11:50 firmware-5.bin.zst
> -rw-r--r-- 1 root root 390717 Nov 29 11:50 firmware-sdio-5.bin.zst
> -rw-r--r-- 1 root root 5222 Nov 29 11:50 notice_ath10k_firmware-5.txt.zst
> lrwxrwxrwx 1 root root 52 Nov 29 11:50 notice_ath10k_firmware-6.txt.zst -> ../../QCA6174/hw3.0/notice_ath10k_firmware-6.txt.zst
> 
> lrwxrwxrwx 1 root root 32 Nov 29 11:50 notice_ath10k_firmware-sdio-5.txt.zst -> notice_ath10k_firmware-5.txt.zst
> 
> 
> 
> mv /lib/firmware/ath10k/QCA9377/hw1.0/firmware-6.bin.zst /root/
> modprobe -r ath10k_pci
> modprobe ath10k_pci
> 
> I checked if any neighbors are on the same channel as my router, but I did not find any. I also exclude this problem because on a Windows laptop I do not have this issue.
> 
> I now have no idea anymore what to check or try. Can anyone help me? Thank you very much!
> 
> 
> 
> Sent with Proton Mail secure email.