On Sun, 27 Apr 2014 13:01:08 +0200 Stefan Jenisch <stefan.jenisch@xxxxxxxxx> wrote: > > So my guess is that the cpu goes into some sort of powersave mode from > time to time. The wakeup from these powersave state results in > latencies. Currently I am looking for a proper solution to this problem > and what I have tried so far: > > - BIOS upgrade > - Upgraded to linux-3.10.12-rt25 > - Disabling all sort of powersave modes in the kernel config > - Activated cpufreq-performance (which seems to be ignored anyway) > - Searched the BIOS for any powersave modes to deactivate (none found) > > I got rather clueless on what else to try! Does anyone has a helping > hint on how to solve this one??? > > With many thanks in advance, > > Stefan J. > Did you get this message when starting cyclictest? # /dev/cpu_dma_latency set to 0us That's a hack that is supposed to prevent the system from entering deeper C-states than C-state 0. What version of rt-tests are you running? Clark
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