Henri, Jan, Gilles thanks for the quick and profound answers
results are just coming in from 'the field' (the problem cases are in the colonies and the folks over there are still working their coffee mugs ;-) Am 13.02.2013 um 12:53 schrieb Gilles Chanteperdrix: > Do you get the same results with Xenomai latency test? yes, it is reproducible this is for boot option "nohlt idle=poll" added: http://imagebin.org/246556 (here for the linuxcnc latency test:http://imagebin.org/246546) this is without that option: http://imagebin.org/246550 - notice sudden 230uS spike so I that takes the linuxcnc latency test out of the equation >> Any suggestions? > > > You have an issue with the idle loop. The three cases you mention cause > the Linux kernel never to use the idle loop: > - switchtest run with the -s argument as a (non real-time) loop > occupying 100% of the CPU. > - the shell loop does the same > - running dohell does the same. That makes sense. Are there any specific knobs you'd suggest twisting? -- thanks a lot! we already have a workaround based on Henri's suggestion; everything else is sugar on the cake - Michael _______________________________________________ Xenomai mailing list [email protected] http://www.xenomai.org/mailman/listinfo/xenomai
