Am 20.03.2013 um 08:48 schrieb Bjørn:

> I bougt this.
> http://www.ebay.com/itm/200542103383?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649
> running the latest version of linuxcnc.

specifically which version? 

I have a D525MW and get much better results

> 
> Hypertreading off in bios,
> ISOLCPU is done.
> 
> when runnnig latencytest and 3 x glxgears + some video i can run for 30 
> min and get:
> servo thread (1.0ms) max interval (ns) 1006129 max jitter 11104
> Base thread (25.0ps) max interval (ns) 42342 max jitter 17463
> 
> i think i could do with this but if i run overnight the same way i get
> servo thread (1.0ms) max interval (ns) 1020138 max jitter 24978
> Base thread (25.0ps) max interval (ns) 83039 max jitter 58160
> 
> does anyone have any idea of hvat this can be? is there a way to se any 
> debugging information?

usually that points to CPU idle/powersave states; it has turned out that wakeup 
from idle/powersave states is rather nondeterministic and a likely cause of 
latency spikes

to isolate whether this is the case, try to boot the kernel with the option 
'idle=poll'

if things improve, idle/powersave states are very likely the cause

-m 


> 
> And another question, is it possible to dedicate one cpu to run gui and 
> other non realtime funktions?
> 
> Regards Bjorn
> 
> 
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