TDA4VM: RPMSG Delay

Hello,

The performance numbers are  https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-jacinto7/10_01_00_04/exports/docs/pdk_jacinto_10_01_00_25/docs/datasheet/jacinto/datasheet_j721e.html

Also refer software-dl.ti.com/.../developer_notes_ipc.html

jianb beifang said:

Scenario 1: Simple PING PONG sending and receiving between A72 and MCU1-0. The delay of sending and receiving is about 50ms in the test on A72.

Scenario 2: There are two tasks on MCU1-0. The two tasks send data to A72 at a period of 100ms, and then A72 and MCU1-0 perform a PING PONG sending and receiving delay test. The maximum delay is more than 400 ms and the minimum delay is 2ms.

MCU1_0 should always contain SCIserver task(DM task) along with your 2 tasks. If A72 runs linux i believe the delay will be more.

You can refer to the above numbers for the optimised numbers 

Regards

Tarun Mukesh

Hello,

jianb beifang said:

Using the ipc_rtos_echo_test example provided with the 10.0 SDK, the time delay for receiving data from A72 is about 50ms, which is very different from the performance data on the official website. What is the possible cause?

This example is not optimised one. The idea of this example is to just echo back the messages but not in optimised time. It has lot of console/UART prints which take more time and on Linux side as well we have prints to show case messages received.

so this example can be optimized way better for optimised performance and the performance numbers in website is where A72 runs bios not linux. Linux system call /Kernel calls will take more time rather than bios.so the performance numbers is to understand the underlying how much time internally it is taking but not with HLOS(High level OS)

Regards

Tarun Mukesh