Re: PREEMPT_RT benchmark

On 2021-03-11, Daniel Wagner [off-list ref] wrote:

On 10.03.21 21:07, Michel Macena Oliveira wrote:

quoted

At least that's what I expected, but my latencies are much bigger than
Cyclictest ones.
 From cyclictest I get an average in my computer of  something between
2300 and 2500 nanoseconds.  However, in my application I'm having
something between 47000 and 55000 nanoseconds. As you can see it is
much higher!

I'm not sure of what I'm doing wrong, could you help or suggest something?

Check if your system uses power managment. cyclictest disables the power 
management by using the /dev/cpu_dma_latency API.

In addition, avoid file I/O in your real-time thread. Store your
calculations in a variable and let another thread read it and write to
disk. Then it would be more "equivalent to Cyclict test".

John Ogness