opengl and drm on a pi 3b?

Eric Anholt eric at
Thu Mar 16 17:55:44 UTC 2017

Gene Heskett <gheskett at> writes:

> Hello all, been a while since I rang your doorbell, greetings from West 
> Virginia;
> I am in the process of converting an old lathe to cnc, and using a pi 3b 
> as the driver.
> Doing some work on the configuration today, I got curious to see if the 
> features I was adding to the configuration were pushing the poor pi to 
> the point of exhaustion. Firing up htop, the various bits and pieces 
> that together make up linuxcnc, were a total of about 4 or 5% of the cpu 
> load.  Compton, the x compositor, was burning something in the region of 
> 165%, or a little over 1.5 of its 4 cores. It was also a few megabytes 
> into swap, so I rebooted it, after which compton was only using perhaps 
> 35% of one core.

That sounds like you're running your compositor in software rendering.
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