On 04/22/2012 01:34 PM, Gilles Chanteperdrix wrote: > On 04/22/2012 01:24 PM, Gilles Chanteperdrix wrote: >> On 04/22/2012 11:10 AM, Wolfgang Grandegger wrote: >>> But all this does not explain a factor of 3 with your driver. I doubt >>> that it's due to a move from 2.6.29 -> 2.6.32. Try using ftrace to find >>> out what's going on (if it's already available). >> >> Threaded interrupts were introduced around this time. And threaded >> interrupts DO have a significant impact on latencies.
Yes, but thread interrupts are normally not enabled/used by default. I'm not speaking about CONFIG_PREEMPT_RT. Well, do we speak about latencies? He just said "reading an ADC on an EP9312 ARM board has slowed by a factor of three". I'm not even sure if it's related to Xenomai at all. xenophile (&$#^?) , could you please be more precise. > But I agree: tracing with ftrace or the I-pipe tracer if using xenomai > to see where the time is spent is the way to go. Yep. Wolfgang. _______________________________________________ Xenomai-help mailing list Xenomai-help@gna.org https://mail.gna.org/listinfo/xenomai-help
