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Old 02-04-2019, 14:52   #1
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OpenCPN running out of CMA memory on Rpi

I am using OpenPlotter on a Rpi3B+ with all the latest updates.
Kernal Version 4.19.30-v7+
OpenCPN V5.0
OpenPlotter is an access point for all on-board WiFi devices.

OpenGL driver with Fake KMS (real kms caused some problems with resolution if started headless).
I have the memory split set to it's lowest value since it makes no difference to the OpenGL driver.

Everything is working very well EXCEPT I get the occasional hang of the display system.

The system can run for days and then one user input like changing scale or changing to/from north/course up sometimes causes the display to hang up.
In this case the cursor still works, everything else is still running but the display is mostly frozen.
If I connect with VNC from another machine a window pops up saying a user is connected.
I can also use PUTTY to connect and view the log.
In every case there is an error from the VC4 driver stating that it can not allocate memory from CMA.

Quote:
pi@openplotter:~ $ dmesg
[21965.710804] [drm:vc4_bo_create [vc4]] *ERROR* Failed to allocate from CMA:
[21965.710817] [drm] V3D: 176852kb BOs (345)
[21965.710821] [drm] V3D shader: 412kb BOs (100)
[21965.710824] [drm] dumb: 3088kb BOs (2)
[21965.710833] vc4_v3d 3fc00000.v3d: Failed to allocate memory for tile binning: -12. You may need to enable CMA or give it more memory.
pi@openplotter:~ $

It looks like OpenPlotter is configured with 256M of CMA memory.
I see this in the system log, but I don't know where it's configured.

I'd like to test this with a larger amount of CMA memory and see if it resolves the problem, but I am not sure how to configure that ?

There is a lot of conflicting information about this. Perhaps someone who knows can explain it to me.
Can I configure a dynamic memory split as described here:https://elinux.org/RPiconfig ?
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Old 05-04-2019, 06:31   #2
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Re: OpenCPN running out of CMA memory on Rpi

Check here:
https://opencpn.org/wiki/dokuwiki/do...iguration_file
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Old 05-04-2019, 07:28   #3
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Re: OpenCPN running out of CMA memory on Rpi

Quote:
Originally Posted by rooiedirk View Post
OK, I guess I can try to limit OpenCPN graphic memory usage, but I have unused RAM that I could allocate to the GPU/CMA; It seems that would be better.
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Old 05-04-2019, 09:54   #4
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Re: OpenCPN running out of CMA memory on Rpi

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Originally Posted by rooiedirk View Post
That file needs better explanations:

MEMCacheLimit overrides NCacheLimit
NCacheLimit only vaild if MEMCacheLimit not defined.
But this is system memory.

GPUMemorySize ????
Is this used at all ?
I could not find it in the code, but perhaps my search was wrong.
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