Robert Schwebel wrote: > On Thu, Jan 10, 2008 at 03:35:27PM +0100, Robert Schwebel wrote: >>> Could you run your cyclictest much longer? >> I'll re-test with your parameters. > > Done, here are the results (data and histogram): > > http://www.pengutronix.de/software/realtime-preempt/20080110-1-cyclictest/20080110-1-phyCORE-MPC5200B-tiny-data.png > http://www.pengutronix.de/software/realtime-preempt/20080110-1-cyclictest/20080110-1-phyCORE-MPC5200B-tiny-histo.png > > Especially the data plot is interesting: it shows that most of the shots > are below 80 us, but there are regular peaks. If you look carefully, you > also see that the peaks are "growing", which usually means that there is > some interference. A latency peak every 16.6 second, hm, interesting. > Time to activate latency hunting... Unfortunately, the latency tracer of the -rt kernel is not available for PowerPC. Wolfgang. - To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
