ORIN NX 16GB MAXN_SUPER mode limited to 25W

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin NX
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1

Hej,

I ran in a similar issue like: Unable to change OC limit on NX 8/16GB boards - Jetson & Embedded Systems / Jetson Orin NX - NVIDIA Developer Forums

We have designed our custom board which ensures that the Module VDD_IN is at 12V and there is a Pull-Up register on the MODULE_ID pin. Software wise we are running a YOCTO based image. Please also find the discussion I have started at the OE4T repo here

When I just run those commands:

nvpmodel -m 0
jetson_clocks
./gpu_burn -tc 0
stress-ng --cpu 8

The overall Power shown in jtop does not exceed 25W. When I perform this:

echo 4472 > /sys/bus/i2c/drivers/ina3221/1-0040/hwmon/hwmon1/curr1_max
echo 4472 > /sys/bus/i2c/drivers/ina3221/1-0040/hwmon/hwmon1/curr1_crit

I do manage to go above the limits, as @WayneWWW mentioned here this is not required. So I do assume I have missed some parts. Can someone guide me to the missing part. Is the limit adjusted in the Linux device-tree or somewhere else. Like @SPFish144 mentioned it is quite unclear weather we do use super mode in a correct way or not.

We also use the gpu_burn and stress-ng to check what are the thermal limits of our housing.

2

I think you misunderstood something there.

Change the OC limit does not mean you won’t hit OC.

Also, changing OC limit is not needed for a Orin NX super.

You should test with 40W mode but not MAXN. MAXN was never a mode that for you to do stress test.

3

The topic with the OC limits is understood, when the hardware getting too hot the system throttles frequency to stay alive. What I may misunderstood, is the fact that we should not use the MAXN_SUPER mode, but should use the 40W mode instead.

We have also considered to define our own customized mode to reflect the limit of our hardware. Again MAXN_SUPER is used to check the limit of our housing.

I had similar observations that for the 40W mode the limits needs to be raised manually. Where are those limits are actually defined?

4

There are 3 kinds of OC and you could find their info in above document.

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