Am 03.11.2012 um 07:19 schrieb Michael Haberler:

...

> Note that latency-test uses RTAPI, and it's entirely possible I committed 
> some goof in the code; it would be worth researching if the spikes we see 
> also appear in the xenomai-supplied latency test

well, looking at: 
http://git.mah.priv.at/gitweb/xenomai-linuxcnc.git/blob/refs/heads/linuxcnc-v2.6.1:/src/testsuite/latency/latency.c

this uses rt_timer_tsc() to do samples, and my RTAPi does a rt_timer_read() 

see 
http://www.xenomai.org/documentation/trunk/html/api/group__native__timer.html#gaa589af3dafaeaa5dcbf2ef7b6dde6af8
 for the fineprint

that might explain different results between xenomai latency and RTAPI 
latency-test

but first this damn spike needs to show up, and it just doesnt right now :-/

-m


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