CPU workload issue with dvsdk 4.02.00.06 on DM368 because of memcpy

Avneet Dhaliwal

Hi all,

Hi I have integrated external USB camera with my video phone application on DM368. The USB camera gives output in MJPEG encoded format but I want to send data over the network in H.264 encoded format.

So first I am decoding the MJPEG data in raw data format and again encoding it in H.264 format and then sending it over the network.
I observed that CPU % usage for this Tx path is around 40%-45% which is very high.

As I checked module wise i found that "Encoder+Send to network" is taking around 25%-30% CPU time. As I dug even deeper I found that "memcpy" alone is taking 7%-10% of CPU time.

I checked the same on DM6446 processor. It is working absolutely fine there.

What can this problem be related to?

I am using dvsdk 4.02.00.06 on DM368 board.

Thanks and Regards,
Avneet

over 13 years ago

0 Krunal Patil over 13 years ago

Genius 3120 points

Use user-space EDMA.

I did it in past for DM355 and DM365, I assume same is available for DM368 also.

Regards,

Krunal

0 Avneet Dhaliwal over 13 years ago in reply to Krunal Patil

Prodigy 130 points

Hi Krunal,

Thanks for reply.

I considered damcopy() option. It asks for picture width and height parameters.

I am sending H.264 encoded data over the network so I don't have width and height parameters. How can I use dmacopy here?

What exactly have you done on dm365?

Thanks for the help,

Avneet

0 Krunal Patil over 13 years ago in reply to Avneet Dhaliwal

Genius 3120 points

You can always get the encoded data side from outArgs params of encoder.

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CPU workload issue with dvsdk 4.02.00.06 on DM368 because of memcpy