PROCESSOR-SDK-J721E: J721E-evm vision app pre build example for the load test on the CPU

Hi Nikhil,

The attached ticket is referred for the changed in the load means load is not exact as what we are feeding but in my case it's different (i.e the current is not increasing ). 

Hi Mahesh,

Yes, currently the load provided is 100 as shown below

Maheshwar reddy said:

Started load test for CPU c7x_1 load is 100

In your case, the load shows around 88% and does not increase to 100%? Is my understanding correct?

If yes, this is the same issue as in the ticket on which we are currently debugging.

The load does not increase and converge to 100% currently and has a load of 86 - 88% for C7x cores currently even though provided as 100% (i.e., mismatch in the value).

The issue is targeted to be fixed by SDK 9.0.

Regards,

Nikhil

Hi Nikhil,

In your case, the load shows around 88% and does not increase to 100%? Is my understanding correct?

No. If put the load as 80% then some current variation should be observed on the power supply right? The current variation is not happening when i put the load. 

Hi Mahesh,

Sorry for the misunderstanding here.
I checked the same at my end and also checked internally regarding the same.

The load test for c7x core would load the core, but the way it is loaded here is such that there is no effect on the current (i.e., there is no usage of MMA or no matrix operations are being done to load the core).

Hence you would not see a rise in current here.

In order to view a rise in current, could you run any DL demos in the SDK that uses the C7x such segmentation, avp etc?

This would definitely rise the current.
Does this satisfy your usecase?

Regards,
Nikhil 

Hi Nikhil,

i am interested in r5f core side load generator. exactly what is DL demos, where i can find that demo in sdk.

Hi Mahesh,

Maheshwar reddy said:

i am interested in r5f core side load generator

This should actually get you mcu2 family load ./vx_app_load_test.out 4 100 60,  

Maheshwar reddy said:

core is 2 The load is 100 percent time is 60 seconds

But the logs says core is 2. Could you please confirm if the logs are matching?

Could you please confirm if you are using J721s2 or J721e? The description says J721e whereas the logs says J721s2.
Could you also please confirm the SDK version that you are using?

Also, when we load R5, the current increase would be very less as R5F consumes low power.

Maheshwar reddy said:

exactly what is DL demos, where i can find that demo in sdk

DL demos are basically to load the C7 DSP cores. This could be found in ${PSDKRA}/vision_apps/apps/dl_demos.

Regards,
Nikhil

Hi Nikhil,

We are using the J721S2 evm board only. Yes the logs are matching for the same soc. What will be the current range it will vary.

Hi Mahesh,

The current change would be very negligible. It would probably be in microAmps - milliAmps.

Let me check internally with the Power solutions experts regarding this.

Meanwhile, could you load the R5 cores using the load test and check if you are able to see an increase in the current?

In the description, I see you have tried for C7 cores. Please try the same for R5 cores.

Regards,
Nikhil

Hi Nikhil,

I tried for the R5F core also there is no change in the current.

Hi Nikhil,

Waiting for the reply.

Maheshwar,

When I carried out this test, I saw the following output:

root@j7-evm:/opt/vision_apps# ./vx_app_load_test.out 4 100 60
...
CPU: mcu2_0: TOTAL LOAD = 7. 0 % ( HWI = 0. 0 %, SWI = 0. 0 % )
CPU: mcu2_1: TOTAL LOAD = 1. 0 % ( HWI = 0. 0 %, SWI = 0. 0 % )
...

So, the device I ran was TDA4VM but it appears that you were using TDA4VE. Nevertheless, I am measuring this on the TI-SOM and can see an increase of 75mA on the CORE domain.

For your test, the current should show an increase on the VDD_CPU rail.

Can you confirm that you are using a SOM (or tell me what kind of system you are using)?

Kevin

Hi Mahesh,

Do we have any updates on the suggestions provided by Kevin?
Please let me know if this has answered your query.

Regards,

Nikhil