eglSwapBuffers suddenly slows down!

[Takashi_Kashiwagi]

Hi Community.

I'm using IMX8MM with yocto linux 4.19.

We are investigating why our Qt application has a low FPS.

And I found that "eglSwapBuffers" suddenly slowed down as follows.

sampling	average[ms]	min[ms]	max[ms]	STDEV.P
10000	0.651	0.167	1661.197	20.79986144

I don't know the cause so far, but is there any workaround?

Best Regards,

T.Kashiwagi

[Bio_TICFSL · Accepted solution]

Hello Takashi san,

If eglSwapbuffers is writting bytes on the next memory page this should be a bug in the vivante driver, rendering activity for one frame has very clearly defined demarcation of what is one frame and what is the next.

However in case of your issue, this is not reproducible in the Yocto BSP that NXP provides, Please provide a sample code to reproduce in our side and get the fix from the developers team, GPU drivers are propietary and are just provided in binary form.

Regards

[Takashi_Kashiwagi]

Hi Bio-san

Thank you for reply!

> However in case of your issue, this is not reproducible in the Yocto BSP that NXP provides, Please provide a sample code to reproduce in our side and get the fix from the developers team, GPU drivers are propietary and are just provided in binary form.

OK. I wil discuss within my team.

Best Regards,

T.Kashiwagi