Unstable frame rate in GigE cameras with Trigger Mode ON

[csgeeek]

Describe the bug
I came across this issue where with the same camera settings I am getting stable FPS on my Lenovo laptop, but on my PCs there’s a significant frame rate instability.

To Reproduce
Steps to reproduce the behavior:

Regarding the camera settings I am using:

TriggerSource: Software
TriggerMode: ON
I benchmarked the above results with the Aravis python module and got to know that the instability is at stream buffer pop part.

timeout = 2e5
buffer: Aravis.Buffer = stream.timeout_pop_buffer(timeout)

With TriggerMode set to OFF I am getting a stable FPS on both the systems. I checked this with arv-camera-test tool.

Expected behavior
There shouldn't be any instability in camera frame rate with TriggerMode ON.

Camera description:

• Manufacturer: Basler
• Model: acA1920-25gc
• Interface: GigE

Platform description:

• Aravis version: 0.8.31
• OS: Ubuntu 22.04
• Hardware: x86_64

Additional context
Just adding this for extra info, I also ran a benchmark with pypylon with the same set of camera settings. It provides stable FPS on both the type of systems. With TriggerMode OFF Aravis is able to achieve slightly higher FPS as well sometimes. But with TriggerMode ON there’s instability on PC systems and not on laptops.

Please feel free to ask for any logs required for further debugging.