qt qml use canvas show image slow

Hi,tk1,Using QT QML canvas control, display pictures or color blocks, very slow, 800*800 pixel by pixel display takes 4-6 seconds, at X86 PC, in about 1 second or so, want to ask how to improve the display speed?

Hi justrobot,

Since QT is not what from NV, what I can tell is please check if the cpu/gpu performance is already the highest. If not, please raise their frequency.


Hi Wayne, Thank you for your answer. I want to know how to check cpu frequency and how to modify?

Thanks so much.

Hi justrobot,

we provided a app called tegrastats that would show the loading of each cpu.

To modify it, it is similar to TX1.

#Example that change cpu0 freq to max.
 echo userspace > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
   cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq