Fix Wi-Fi Ping Spikes on Linux (Gaming)

linux-wifi-ping-fix.md

Fix Wi-Fi Ping Spikes on Linux (Realtek/Fedora)

This guide fixes periodic ping spikes (100ms+) on Linux, specifically targeting Realtek cards (like RTL8852BE) that struggle with WiFi 6 (802.11ax) or aggressive power saving.

Prerequisites

Identify your interface name (e.g., wlo1) and driver:

ip link show
lspci -nnk | grep -iA3 net

Replace <YOUR_INTERFACE> below with your actual interface name.

---

Step 1: Disable NetworkManager Power Saving

Prevents the OS from putting the card to sleep during inactivity.

1. Create config file:

   sudo tee /etc/NetworkManager/conf.d/wifi-powersave.conf <<EOF
   [connection]
   wifi.powersave=2
   EOF

   (Note: 2 means "Disable Power Save")

2. Apply immediately:

   sudo iw dev <YOUR_INTERFACE> set power_save off

---

Step 2: Configure Realtek Driver (The Fix)

Disables hardware-level sleep (ASPM) and forces WiFi 5 (AC) mode, as WiFi 6 implementation on these drivers is often unstable.

1. Create driver options file:

   sudo tee /etc/modprobe.d/rtw89.conf <<EOF
   options rtw89_core disable_ps_mode=Y disable_11ax=Y
   options rtw89_pci disable_aspm_l1=Y disable_aspm_l1ss=Y
   EOF

   Note: disable_11ax=Y turns off WiFi 6, which cures the micro-stutters.

2. Reboot your system.

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Step 3: Lock BSSID (Optional Stability)

If you have a Mesh system or many routers nearby, this stops the card from scanning for "better" signals in the background.

1. Find your router's BSSID (MAC Address):

   nmcli -f IN-USE,SSID,BSSID dev wifi

   (Copy the BSSID from the line with the *)

2. Lock the connection:

   nmcli connection modify "YOUR_WIFI_SSID" 802-11-wireless.bssid "YOUR_BSSID_HERE"

---

Verification

After rebooting:

1. Check Power Save is OFF:

   iw dev <YOUR_INTERFACE> get power_save
   # Output should be: Power save: off

2. Check WiFi 6 is OFF:

   iw dev <YOUR_INTERFACE> link
   # "tx bitrate" should say VHT (WiFi 5), not HE (WiFi 6)

3. Check Driver Options:

   cat /sys/module/rtw89_core/parameters/disable_11ax
   # Output should be: Y

---

What We Did

• wifi.powersave=2: Stops OS from requesting sleep.
• disable_11ax=Y: Forces card to use WiFi 5 (AC). Realtek's WiFi 6 (AX) stack often buffers packets, causing spikes.
• disable_aspm_l1/l1ss: Prevents PCIe lane from powering down (fixes "waking up" lag).
• BSSID Lock: Prevents background roaming scans.

Just what I was looking for!
Helped me out a ton! Thank you very much for this!

Just what I was looking for! Helped me out a ton! Thank you very much for this!

I'm glad it helped! I still had some issues afterwards, but disabling ax mode helped (updated gist)

I see the change! I had issues with microstutter, but everything else already helped me like day and night, so I was content with what I had. Right now, I have disabled ax mode too, and hopefully this will help too!
Once again, thank you very much!

Thanks! Really works! All the LLMs were silent about it!