Measuring Input Latency on Linux

Latency Comparison: X11 vs. Wayland

Linux gained popularity among gamers two years ago for its potential to outperform Windows in FPS and input latency. The author, a competitive FPS gamer, switched to Linux and noticed a significant improvement. Optimizing Linux for gaming became a priority, with a focus on low latency and consistent frame times.

The author investigated input latency on Linux, comparing X11 and Wayland display servers. X11 is the traditional display server, while Wayland is its modern replacement. The difference between them lies in how they handle input and rendering.

Tests showed that Wayland had lower input latency compared to X11. The author measured latency using a high-speed camera, capturing the time between mouse clicks and on-screen responses. Results indicated that Wayland's latency was around 10-15 ms lower than X11's.

Can Variable Refresh Rate Reduce Latency?

The author also examined the effect of Variable Refresh Rate (VRR) on input latency. VRR synchronizes the display's refresh rate with the GPU's frame rate, potentially reducing latency. Tests revealed that VRR did lower input latency, especially when combined with Wayland.

Using DXVK, a translation layer for DirectX games on Linux, also impacted input latency. DXVK improved performance and reduced latency in some games. The author's findings suggest that Linux gamers can achieve lower input latency with the right configuration.

Frequently Asked Questions

What is the best display server for low latency gaming on Linux? Wayland is recommended due to its lower input latency compared to X11. Gamers should consider switching to Wayland for a more responsive experience.

Does VRR always reduce input latency? VRR can lower input latency, especially with Wayland, but results may vary depending on the specific hardware and game.

Can DXVK improve input latency for all games on Linux? DXVK can improve performance and reduce latency in some games, but its effectiveness depends on the game and system configuration.