Why xorg take 33% of the gpu utlization?

Robotics & Edge Computing Jetson & Embedded Systems Jetson Thor
1

hi,

on devkit, why xorg take 33% of the gpu utlization?

2
21706×1279 151 KB

1
11706×1279 112 KB

2

I can’t give you an exact answer, but consider Xorg an interface to the GPU. Xorg isn’t just for graphics, it also includes a lot of CUDA apps. So if you run anything CUDA which goes through Xorg, then I’d suspect this is why. If you do anything with direct rendering graphics, then I’d also suspect it for this. tegrastats might be useful for you to see some GPU activity information.

3

there is no cuda apps runs, you can see from the first picture.
tegrastats don’t help, because it only have freq info, don’t have gpu utlization info.

sudo tegrastats
12-01-2025 10:19:51 RAM 6779/125772MB (lfb 50x4MB) CPU [27%@2601,2%@2601,5%@1674,1%@1674,2%@972,5%@972,4%@972,4%@972,2%@972,3%@972,3%@972,2%@972,12%@972,7%@972] EMC_FREQ 6%@4266 GR3D_FREQ @[1331,1331,1331] NVENC0_FREQ @1556 NVENC1_FREQ @1556 NVDEC0_FREQ @1556 NVDEC1_FREQ @1556 NVJPG0_FREQ @1556 VIC 56%@567 OFA_FREQ @1556 PVA0_FREQ off APE 300 [email protected] [email protected] iwlwifi_1@54C [email protected] [email protected] [email protected] VDD_GPU 7931mW/7931mW VDD_CPU_SOC_MSS 8864mW/8864mW VIN_SYS_5V0 8319mW/8319mW

4

Are there any apps running in the GUI desktop?

5

Nothing running on GUI. the system is on idle status. we can reproduce this problem at devkit.

6

I’m not sure how much of nvidia-smi is on Thor, but do you see anything from:
nvidia-smi pmon -c 1

7

nvidia-smi pmon is not supported at thor.
you can see from below topic

maybe nvidia-smi compute gpu display into gpu utlization? i am not sure, need nvidia to check.
it is very easy to reproduce this issue at devkit.

8

Without that I’m not sure how to compute utilization. Someone from NVIDIA will have to answer that, maybe @AastaLLL . Most of the support for nvidia-smi is limited when not using a PCI discrete GPU.