Linux/AM5728: 60 FPS support

Paul Orrungroj

Part Number: AM5728

Tool/software: Linux

It's not possible to maintain 60 FPS on this processor. I tried both eglfs and wayland. I've attached a sample program that does nothing in the render loop but log the time period between updates.* After 5 minutes, it outputs a log file. Wayland is worse than eglfs, but either way there are several frames dropped over this timespan due to missing vsync.

* I have a couple lines of code setting the rendering to single buffer, but it doesn't end up taking effect anyways, so it's not a relevant issue for this example.

over 7 years ago

0 Paul Orrungroj over 7 years ago

Prodigy 100 points

Here's the source.NTDemo.zip

0 Biser Gatchev-XID over 7 years ago in reply to Paul Orrungroj

TI__Guru**** 393215 points

What is the video format?

0 Paul Orrungroj over 7 years ago in reply to Biser Gatchev-XID

Prodigy 100 points

The display resolution is 1080p.

0 Biser Gatchev-XID over 7 years ago in reply to Paul Orrungroj

TI__Guru**** 393215 points

Thanks. The video experts have been notified. They will respond here.

0 Manisha Agrawal over 7 years ago

TI__Mastermind 22386 points

What's your end use case that needs to meet 60 fps performance?

0 Paul Orrungroj over 7 years ago in reply to Manisha Agrawal

Prodigy 100 points

My application's users track and analyze moving images for long periods of time. Being able to animate at a constant high frame rates reduces fatigue.

0 Paul Orrungroj over 7 years ago in reply to Manisha Agrawal

Prodigy 100 points

Do you have any updates regarding this issue?

0 Rogerio Almeida over 7 years ago in reply to Paul Orrungroj

TI__Mastermind 26025 points

Paul,
Sorry for the delay....we will reply soon...

0 Manisha Agrawal over 7 years ago in reply to Paul Orrungroj

TI__Mastermind 22386 points

I ran NTDemo that you shared at my end and I see the timing difference as 0.0133 sec that is 75 fps. I am seeing this with eglfs QPA. Qgears and GLbenchmark results as well shows that 60 fps is achievable. Which QPA are you using?

0 Paul Orrungroj over 7 years ago in reply to Manisha Agrawal

Prodigy 100 points

We tried with eglfs, minimalegl, and wayland-egl. Our sample logs 18,000 frames. How many frames were you able to achieve 0.0133 seconds? Can you attach the full log?

0 Manisha Agrawal over 7 years ago in reply to Paul Orrungroj

TI__Mastermind 22386 points

Hi Paul,

I tried your demo some 2 weeks back where I found 0.0133 sec timing. My working setup has changed since then and I am not able to recollect the version of my software that I was working on (released or internal development). Now with the current setup I am seeing 18000 frames log as yours which is 60 fps. It seems internal QPAs not letting disable vsync and hence the achieved fps is tied to display refresh rate.

0 Manisha Agrawal over 7 years ago in reply to Manisha Agrawal

TI__Mastermind 22386 points

Hi Paul,

Mystery of I seeing 0.0133 sec timing is resolved. My display was HDMI monitor setup with 1024x768@75 fps. That explains why I was seeing 75 fps or 0.0133 timing interval between updates.

SGX driver DDK 1.14 don’t support disable of Vsync in SGX for GBM / Wayland. Display driver also doesn't support DRM_MODE_PAGE_FLIP_ASYNC and hence disabling vsync will work with off-screen buffers only. Attached developers version of off-screen WSEGL that shows avg period of 0.006529.

libpvrNODISPLAYWSEGL.so

root@am57xx-evm:~# ./NTdemo -platform eglfs

Unable to query physical screen size, defaulting to 100 dpi.

To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).

Avg wait period = 0.006529

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Linux/AM5728: 60 FPS support