RK3568 NPU frequency cannot improve the NPU performance

#1

default NPU frequence is 600Mhz( can be checked in /sys/class/devfreq/fde40000.npu/cur_freq), and it takes around 50ms with one 480x480 picture inference. I changed the governor to “userspace”, and set the frequency in /sys/class//devfreq/fde40000.npu/userspace/set_frequency to “900000000”, and I could see cur_freq is 900M, but the field test show nothing improvement (still 50ms per picture), anything wrong with my configuration? thanks

#2

Hi,

I’m trying to reproduce your issue.
Please tell me your board and system image.

If could, provide more details about your operation to help reproduce the issue.

#3

Hi I have a Rock3A board, 2G RAM, rock-3a-ubuntu-focal-server-arm64-20221101-0219-gpt.img;
here is the command sequence:
rock@rock-3a:~$ cat /sys/class/devfreq/fde40000.npu/cur_freq
600000000
rock@rock-3a:~$ cat /sys/class/devfreq/fde40000.npu/governor
userspace
rock@rock-3a:~$ cat /sys/class/devfreq/fde40000.npu/userspace/set_freq
undefined
rock@rock-3a:~$ sudo su
[sudo] password for rock:
root@rock-3a:/home/rock# echo 900000000 > /sys/class/devfreq/fde40000.npu/userspace/set_freq
root@rock-3a:/home/rock# cat /sys/class/devfreq/fde40000.npu/userspace/set_freq
900000000
root@rock-3a:/home/rock# cat /sys/class/devfreq/fde40000.npu/cur_freq
900000000
after this, I start my program, and the inference time is almost the same.
Thanks.

#4

Is the number in cur_freq the real running frequency of NPU? please help to check and confirm, thanks.

#5

Hi Stephen, any progress? thanks