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sam sokolik	30/09/2023 16:10:51
126 forum posts	well - for linuxcnc it depends on the realtime latency of the system. I have been running the PI4 with linuxcnc for a long time - but using a mesa ethernet card to do the heavy lifting. (step generation and such) The maximum jitter I get is around 50us or so. This is perfectly fine for external interfaces like mesa. Linuxcnc does have a gpio driver for the pi - but again you are limited to how fast the realtime kernel can twittle bits. I I goofed around with it a while back - and was getting about 10khz step rates. Not stellar...
Russell Eberhardt	02/10/2023 10:16:40
2785 forum posts 87 photos	Posted by sam sokolik on 30/09/2023 16:10:51: well - for linuxcnc it depends on the realtime latency of the system. I have been running the PI4 with linuxcnc for a long time - but using a mesa ethernet card to do the heavy lifting. (step generation and such) The maximum jitter I get is around 50us or so. This is perfectly fine for external interfaces like mesa. Linuxcnc does have a gpio driver for the pi - but again you are limited to how fast the realtime kernel can twittle bits. I I goofed around with it a while back - and was getting about 10khz step rates. Not stellar... My ancient system is giving a maximum jitter of 25uS and I am happy with the maximum step rate. I have no need for particularly fast movements. Might the GPU of the Pi 5 take load off the processors and improve the latency over the model 4? Russell Russell

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