13:27 <heeen> I'm developing a qtwayland/qml compositor on imx6 and I am seeing 60fps for the compositor without clients (eglfs), which drops to just 30fps with a very simple client

13:27 <heeen> I want to know if there's a way to profile gpu usage or if I'm hitting some other limitation

13:28 <heeen> resolution is 1280 800, so noething really taxing

13:33 <austriancoder> heeen: a very basic starting point could be GALLIUM_HUD=help (some gpu performance counter are exposed there .. but the numbers are per draw call)

13:41 <heeen> thanks

13:41 <heeen> I can see the fps graph and frame time corresponding to my own numbers

13:42 <heeen> its going from 1 to 3 draw calls when rendering the client

13:42 <heeen> I need something to query the global gpu usage

13:43 <heeen> or see if theres some weird stalling wrt wayland buffers

14:02 <lynxeye> heeen: I'm working on exposing this kind of stats right now, but it's not available in upstream, yet.

14:04 <lynxeye> heeen: Also, which imx6 is this? 1280x800 can already be taxing for some of them if you have little memory bandwidth and have the compositor do actual composition.

14:17 <austriancoder> lynxeye: interesting.. something like my loadavg patch series?

14:22 <cphealy> Not sure if any etnaviv folks have seen it or not, but with at least freedreno and panfrost, the GPU hw counters are now exposed via an ioctl and Mesa has perfetto integration which makes offline analysis very nice. Here's a blog for the functionality with Panfrost: https://www.collabora.com/news-and-blog/blog/2020/08/21/panfrost-performance-counters-with-perfetto/

14:24 <austriancoder> cphealy: perfetto is the end goal .. but -ENOTIME

14:25 <cphealy> ha, yea, I get it. Just wanted to make sure everyone was aware what is going on with other drivers.

14:26 <cphealy> Also, when it comes to GPU load, there's the new kernel interface for exposing per-client GPU load that Intel first landed. This is now supported by Freedreno too. Might be good to have with etnaviv as this would allow the same "gputop" type tool to work across multiple GPUs.

14:27 <austriancoder> have seen it.. yeah.. nice thing

14:33 <lynxeye> austriancoder: Nope, plain fdinfo filled from stats available in the gpu scheduler.

14:35 <austriancoder> nice

16:22 <heeen> https://manerosss.wordpress.com/2017/07/13/howto-gallium-hud/

16:23 <heeen> this mentions GPU-load as a value to track, but my mesa/gallium/etnaviv does not seem to have that

16:51 <cphealy> heeen: you should see a list of GPU counters available with GALLIUM_HUD=help. What do you get?

16:51 <cphealy> Also,what version of Mesa are you using?

16:53 <austriancoder> heeen: https://cgit.freedesktop.org/mesa/mesa/tree/src/etnaviv/drm/etnaviv_perfmon.c

16:57 <austriancoder> and here is the full list: https://cgit.freedesktop.org/mesa/mesa/tree/src/gallium/drivers/etnaviv/etnaviv_perfmon.c