CPU Throttling more on 4.9 than 4.4

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
15

@sumitg: That looks better! The freq still goes down sometimes, but mostly, it’s around the max frequency:

...
RAM 165/7853MB (lfb 1838x4MB) CPU [0%@2034,0%@2034,16%@2035,6%@2035,2%@2035,0%@2035] EMC_FREQ 0%@1866 GR3D_FREQ 0%@1300 APE 150 MTS fg 0% bg 0% PLL@40.5C MCPU@40.5C PMIC@100C Tboard@36C GPU@40C BCPU@40.5C thermal@40.5C Tdiode@38.75C VDD_SYS_GPU 229/229 VDD_SYS_SOC 766/791 VDD_4V0_WIFI 0/0 VDD_IN 3140/3368 VDD_SYS_CPU 612/836 VDD_SYS_DDR 1113/1112
RAM 165/7853MB (lfb 1838x4MB) CPU [0%@2035,10%@2034,8%@2035,7%@2037,1%@2033,0%@2031] EMC_FREQ 0%@1866 GR3D_FREQ 0%@1300 APE 150 MTS fg 0% bg 0% PLL@40.5C MCPU@40.5C PMIC@100C Tboard@36C GPU@40.5C BCPU@40.5C thermal@40.5C Tdiode@38.75C VDD_SYS_GPU 229/229 VDD_SYS_SOC 766/790 VDD_4V0_WIFI 0/0 VDD_IN 3179/3366 VDD_SYS_CPU 612/834 VDD_SYS_DDR 1113/1112
RAM 164/7853MB (lfb 1838x4MB) CPU [0%@2023,15%@2035,8%@2034,0%@2022,0%@2026,0%@2021] EMC_FREQ 0%@1866 GR3D_FREQ 0%@1300 APE 150 MTS fg 0% bg 0% PLL@40.5C MCPU@40.5C PMIC@100C Tboard@36C GPU@40.5C BCPU@40.5C thermal@40.5C Tdiode@39C VDD_SYS_GPU 229/229 VDD_SYS_SOC 766/790 VDD_4V0_WIFI 0/0 VDD_IN 3255/3365 VDD_SYS_CPU 689/833 VDD_SYS_DDR 1113/1112
RAM 164/7853MB (lfb 1838x4MB) CPU [0%@2040,10%@2035,5%@2034,0%@2039,0%@2042,0%@2039] EMC_FREQ 0%@1866 GR3D_FREQ 0%@1300 APE 150 MTS fg 0% bg 0% PLL@40.5C MCPU@40.5C PMIC@100C Tboard@36C GPU@40C BCPU@40.5C thermal@40.5C Tdiode@38.75C VDD_SYS_GPU 229/229 VDD_SYS_SOC 766/790 VDD_4V0_WIFI 287/2 VDD_IN 3409/3365 VDD_SYS_CPU 536/829 VDD_SYS_DDR 1113/1112
RAM 164/7853MB (lfb 1838x4MB) CPU [0%@1976,8%@2035,20%@2034,0%@2020,2%@2019,0%@2021] EMC_FREQ 0%@1866 GR3D_FREQ 0%@1300 APE 150 MTS fg 0% bg 0% PLL@40.5C MCPU@40.5C PMIC@100C Tboard@36C GPU@40.5C BCPU@40.5C thermal@40.5C Tdiode@38.75C VDD_SYS_GPU 229/229 VDD_SYS_SOC 766/790 VDD_4V0_WIFI 345/6 VDD_IN 3523/3367 VDD_SYS_CPU 612/827 VDD_SYS_DDR 1113/1112
RAM 165/7853MB (lfb 1838x4MB) CPU [0%@1973,15%@2035,8%@2035,1%@2020,0%@2024,2%@2019] EMC_FREQ 0%@1866 GR3D_FREQ 0%@1300 APE 150 MTS fg 0% bg 0% PLL@40.5C MCPU@40.5C PMIC@100C Tboard@37C GPU@40.5C BCPU@40.5C thermal@40.5C Tdiode@38.75C VDD_SYS_GPU 229/229 VDD_SYS_SOC 766/789 VDD_4V0_WIFI 19/6 VDD_IN 3179/3365 VDD_SYS_CPU 612/825 VDD_SYS_DDR 1113/1112
RAM 164/7853MB (lfb 1838x4MB) CPU [0%@2034,9%@2033,16%@2035,0%@2016,0%@2022,0%@2019] EMC_FREQ 0%@1866 GR3D_FREQ 0%@1300 APE 150 MTS fg 0% bg 0% PLL@40.5C MCPU@40.5C PMIC@100C Tboard@37C GPU@40.5C BCPU@40.5C thermal@40.3C Tdiode@38.75C VDD_SYS_GPU 229/229 VDD_SYS_SOC 766/789 VDD_4V0_WIFI 0/6 VDD_IN 3179/3363 VDD_SYS_CPU 612/823 VDD_SYS_DDR 1113/1112
RAM 165/7853MB (lfb 1838x4MB) CPU [1%@2022,23%@2035,1%@2034,0%@2017,0%@2037,0%@2041] EMC_FREQ 0%@1866 GR3D_FREQ 0%@1300 APE 150 MTS fg 0% bg 0% PLL@40.5C MCPU@40.5C PMIC@100C Tboard@37C GPU@40C BCPU@40.5C thermal@40.5C Tdiode@38.75C VDD_SYS_GPU 229/229 VDD_SYS_SOC 766/789 VDD_4V0_WIFI 0/6 VDD_IN 3217/3362 VDD_SYS_CPU 689/821 VDD_SYS_DDR 1113/1112
RAM 164/7853MB (lfb 1838x4MB) CPU [0%@2033,9%@2035,8%@2034,0%@2033,0%@2021,2%@2037] EMC_FREQ 0%@1866 GR3D_FREQ 0%@1300 APE 150 MTS fg 0% bg 0% PLL@40.5C MCPU@40.5C PMIC@100C Tboard@37C GPU@40.5C BCPU@40.5C thermal@40.3C Tdiode@38.75C VDD_SYS_GPU 229/229 VDD_SYS_SOC 842/789 VDD_4V0_WIFI 0/6 VDD_IN 3140/3359 VDD_SYS_CPU 612/819 VDD_SYS_DDR 1113/1112
...

Two questions though:

  1. Why is the userspace governor better for this case? Why did you only set the governor for cpu0, not for the Denver cores?
  2. Why does the freq still change a bit? What is the change dependent on? Is it a hardware configuration?