Incorrect reporting at high frame rates

[Duckleeng]

This issue is present since PresentMon release 2.1.0 and doesn't happen on any prior versions.

All provided examples are done with my release of liblava (lava-triangle.exe), although I have confirmed it happens with other programs too, such as GFXTest.

Frame rate is capped using -fps=[cap] command line argument for liblava. The issue appears to happen once the frame rate exceeds around 1500 fps.

Comparison between releases 1.10.0 and 2.3.1

Unlimited FPS

900 FPS Cap

2000 FPS Cap

CSV files:

PresentMon 1.10.0 900 fps.csv PresentMon 1.10.0 2000 fps.csv PresentMon 1.10.0 Unlimited.csv PresentMon 2.3.1 900 fps.csv PresentMon 2.3.1 2000 fps.csv PresentMon 2.3.1 Unlimited.csv