NVIDIA Jetson Xavier - Performance Tuning by Setting CPU, GPU, and Frequency Values Manually

NVIDIA®Jetson Xavier™
Introduction
SoM Overview Carrier Boards NVIDIA Xavier Developer Kit Connect Tech Rogue Connect Tech Mimic Software Support NVIDIA JetPack
JetPack 5.0.2
Getting Started Installing JetPack Flashing the board with GUI installer JetPack Components Compiling Source Code Flashing the Board from Cmdline Performance Tuning Evaluating Performance Set Values Manually Tuning Power Maximizing Performance
Development in the Board
Getting into the Board Using Serial Console Using SSH Using Ubuntu Login Installing Packages
Video Capture and Display
Description Supported Cameras Imx219 Driver Software Support Using GStreamer Using Libargus
Processors
HD Audio and Video Subystem Video Encoder Video Decoder JPEG Encoder and Decoder Video Image Compositor Audio Processing Engine Deep Learning Accelerator Volta GPU Description Using CUDA Using OpenGL
Interfaces
I2C SD/eMMC Controller USB Controller
GStreamer Pipelines
Capture and Display H264 H265 VP9 MPEG4 Simultaneous Streams Compositor
Deep Learning
TensorRT Using TensorRT integrated with Tensorflow Parsing a Tensorflow model for TensorRT Parsing Caffe model for TensorRT Building TensorRT API examples Deep Learning Accelerator Software Support Deep Learning Tutorials Jetson Inference Jetson Reinforcement
RidgeRun Products
GstPTZR GstCUDA GstColorTransfer GstWebRTC GstRtspSink GstInterpipe GstInference GStreamer Daemon GstShark
Reference Documentation
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Manage CPU State

The Tegra will always boot from one CPU denominated the master CPU, this cannot be turned off, and all other CPUs can be turned off.

To manually turn on/off slave CPUs

1) Run the following command to turn on the slave CPU:

CPU=cpu1 #The number can be changed from 1-7
echo 1 > /sys/devices/system/cpu/$CPU/online

2) Run the following command to turn the slave CPU off:

echo 0 > /sys/devices/system/cpu/$CPU/online

To check the CPU state run the following commands:

cat /sys/devices/system/cpu/$CPU/online

3D Frequency Scaling

Frequency scaling allows the Tegra to change the CPU frequency according to the load in order to reduce power consumption, 3D frequency scaling is enabled by default.

To disable 3D frequency scaling run the following command:

echo 0 >  /sys/devices/17000000.gv11b/enable_3d_scaling

To enable 3D frequency scaling run the following command:

echo 1 >  /sys/devices/17000000.gv11b/enable_3d_scaling

Change CPU Frequency

To print the CPU lower boundary, upper boundary, and current frequency run the following commands:

CPU=cpu1 #The number can be changed
cat /sys/devices/system/cpu/$CPU/cpufreq/cpuinfo_min_freq
cat /sys/devices/system/cpu/$CPU/cpufreq/cpuinfo_max_freq
cat /sys/devices/system/cpu/$CPU/cpufreq/cpuinfo_cur_freq

To change the CPU upper boundary run the following command:

CPU_FREQ=115200
CPU=cpu1 #The number can be changed
echo $CPU_FREQ > /sys/devices/system/cpu/$CPU/cpufreq/scaling_max_freq

To change the CPU lower boundary run the following command:

CPU_FREQ=2265600
CPU=cpu1 #The number can be changed
echo $CPU_FREQ > /sys/devices/system/cpu/$CPU/cpufreq/scaling_min_freq

To set the static CPU frequency run the following commands:

CPU_FREQ=2265600
CPU=cpu1 #The number can be changed
echo $CPU_FREQ > /sys/devices/system/cpu/$CPU/cpufreq/scaling_min_freq
echo $CPU_FREQ > /sys/devices/system/cpu/$CPU/cpufreq/scaling_max_freq

Where CPU_FREQ must be among the values in /sys/devices/system/cpu/$CPU/cpufreq/scaling_available_frequencies

Change GPU Frequency

To print the GPU lower boundary, upper boundary, and current frequency run the following commands:

cat /sys/devices/17000000.gv11b/devfreq/17000000.gv11b/min_freq
cat /sys/devices/17000000.gv11b/devfreq/17000000.gv11b/max_freq
cat /sys/devices/17000000.gv11b/devfreq/17000000.gv11b/cur_freq

To change the GPU upper boundary run the following command:

GPU_FREQ=675750000
echo $GPU_FREQ > /sys/devices/17000000.gv11b/devfreq/17000000.gv11b/max_freq

To change the GPU lower boundary run the following command:

GPU_FREQ=114750000
echo $GPU_FREQ > /sys/devices/17000000.gv11b/devfreq/17000000.gv11b/min_freq

To set the static GPU frequency run the following command:

GPU_FREQ=675750000
echo $GPU_FREQ > /sys/devices/17000000.gv11b/devfreq/17000000.gv11b/min_freq
echo $GPU_FREQ > /sys/devices/17000000.gv11b/devfreq/17000000.gv11b/max_freq

Where GPU_FREQ is the value available in: /sys/devices/17000000.gv11b/devfreq/17000000.gv11b/available_frequencies

Change Memory Frequency

echo 1 > /sys/kernel/debug/bpmp/debug/clk/emc/mrq_rate_locked
echo 1 > /sys/kernel/debug/bpmp/debug/clk/emc/state
echo 665600000 > /sys/kernel/debug/bpmp/debug/clk/emc/rate

To print the EMC lower boundary, upper boundary, and current frequency run the following commands:

cat /sys/kernel/debug/bpmp/debug/clk/emc/min_rate
cat /sys/kernel/debug/bpmp/debug/clk/emc/max_rate
cat /sys/kernel/debug/bpmp/debug/clk/emc/rate

To change the EMC upper boundary run the following command:

EMC_FREQ=2133000000
echo $EMC_FREQ > /sys/kernel/debug/bpmp/debug/clk/emc/max_rate

To change the EMC lower boundary run the following command:

EMC_FREQ=204000000
echo $EMC_FREQ > /sys/kernel/debug/bpmp/debug/clk/emc/min_rate

To set static EMC frequency run the following commands:

EMC_FREQ=2133000000
echo 1 > /sys/kernel/debug/bpmp/debug/clk/emc/mrq_rate_locked
echo 1 > /sys/kernel/debug/bpmp/debug/clk/emc/state
echo $EMC_FREQ > /sys/kernel/debug/bpmp/debug/clk/emc/rate

Where EMC_FREQ in kHz is the value available in: /sys/kernel/debug/bpmp/debug/emc/tables/regular/