Yes, the BeagleBone Black,
the PRU is hat 10us step length and 1us step time.
The servo task period, in nano sec is 1000000.
When i run a latency test i get a jitter of approximately 56000 to 60000 ns max 
Jitter

I’ll disable the screensaver to check.

On 14 Jan 2014, at 19:13, Sebastian Kuzminsky <[email protected]> wrote:

> On 1/14/14 11:07 , Bas de Bruijn wrote:
>> I’m having an error resulting in missing steps so the layers I’m printing 
>> shift. The file I print is pretty big (17MB). But the error does not happen 
>> at the same hight. How can i find what’s happening? Do i need to switch off 
>> the screensaver for example? or is there something else i can check?
> 
> You're on the Beaglebone Black, running Xenomai?  I'm not sure exactly 
> what the realtime performance and jitter on that platform should be 
> expected to me.
> 
> Try running the latency measuring tool (it used to be called 
> 'latency-test', there's also latencyhistogram and latencyplot) and see 
> if turning off the screensaver helps.
> 
> 
> -- 
> Sebastian Kuzminsky
> 
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