AGXorin/embedded/Camera/E-CON][AR0521] FPS decreasing to 2FPS when streaming over the network

I am working on a AR0521 based stereo camera project that involves streaming data from AGX ORIN to a Windows PC over a network. We are using 1920x1080 with a two-lane MIPI 10-bit raw output with NVIDIA ISP. We are using Jetpack 5.1 (L4T35.2.1). We have boosted the VI, NVCSI, ISP clocks to maximum, set the power mode to MAXN, and encountered an issue where after some time the FPS drops to around 2 when network streaming is initiated. We are using openGL based application for Distortion correction and merging of two frames from the stereo camera. However, after connecting a fan to the AGX ORIN, the FPS stabilizes at the desired 60.

Without the fan, the streaming starts at 60 FPS, but over time, it degrades to 2 FPS, leading to a system hang. The attached kernel crash log indicates an issue - [ 8638.455521] SysRq : HELP : loglevel(0-9) reBoot Crash terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I) thaw-filesystems(J) show-backtrace-all-active-cpus(L) show-memory-usage(M) nice-all-RT-tasks(N) powerOff show-registers(P) show-all-timers(Q) Sync show-task-states(T) Unmount show-blocked-tasks(W) dump-ftrace-buffer(Z)

we disabled the SysRq facility by following this link - SysRq and Cumulus Linux | Knowledge Base

Even after disabling this we are facing the same Issue. Over time the FPS degrades to 2, leading to a system hang.

We observe the CPU-therm in the Jetson Power GUI, and when operating without a fan, if the CPU-therm exceeds approximately 60-65°C, the FPS degrades to 2, resulting in the reported issue. It is noteworthy that, even though the Orin temp does not reach its maximum limit, the problem persists. Interestingly, connecting a fan resolves this issue, ensuring stable system performance without FPS degradation.

Can you please help us to find the rootcause for this issue, as it significantly impacts the performance of the system without an external fan. If further information is needed, please let me know.

Expected Behavior: Stable 60 FPS network streaming without the need for an external fan.

Actual Behavior:

  • Without fan: Streaming starts at 60 FPS, degrades to 2 FPS, and system hangs.
  • With fan: Stable 60 FPS streaming.

Issue is under checking via NVbug, topic closed.

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