How to monitor the DDR bandwidth of orin

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin NX
1

Dear nvidia dev teams：
I have read the following post and feel that it is just an estimate.

How can I accurately obtain bandwidth data?
Additionally, I have used LMbench testing, which can only test the DDR bandwidth of the CPU. However, when we perform model inference, GPU, DLA, and CPU all access DDR. How can we see the total bandwidth data.
Thanks.

3

Maybe try --interval to check

Thanks

5

Thanks for your reply，ShaneCCC
I tried --interval, but it’s still only a percentage，I can’t see the real bandwidth

6 
root@nvidia-desktop:~# tegrastats --interval<int>
-bash: syntax error near unexpected token `newline'
root@nvidia-desktop:~# tegrastats --interval <int>
-bash: syntax error near unexpected token `newline'
root@nvidia-desktop:~# tegrastats --interval <int>
-bash: syntax error near unexpected token `newline'

Looks like something’s not quite right

7

This parameter only change the sample rate like below each 1 millisec get the data.

tegrastats --interval 1

8 
 EMC_FREQ 0%@2133

there’s no specific bandwidth monitoring tool?I want to see the actual bandwidth speed,

9

What do you mean bandwidth speed? @2133 is the speed?

10

I know that the theoretical bandwidth speed of orin’s DDR is 102GB/S（3200x256/8）. I would like to know the specific speed of the current situation,not the percentage.
Thanks，ShaneCCC

11

The speed is should be able get from below node.

 sudo cat /sys/kernel/debug/bpmp/debug/clk/emc/rate
12 
nvidia@nvidia-desktop:~$ sudo cat /sys/kernel/debug/bpmp/debug/clk/emc/rate
2133000000

This value is always 2333, I think it should be seeing the current frequency

cat /sys/kernel/actmon_avg_activity/mc_all
14

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