On Feb 25, 2013, at 12:03 PM, Hartmut Behrens <hartmut.behrens@xxxxxxxxx> wrote:
> Dear RT Folks,
>
> After successfully patching a 3.2 kernel (gumstix platform) with
> patch-3.2-rt10, I obtained the rt-tests suite from
> git://git.kernel.org/pub/scm/linux/kernel/git/clrkwllms/rt-tests.git
>
> I enabled CONFIG_PREEMPT_RT in menuconfig and disabled "CPU frequency scaling".
>
> Compilation of rt-tests ("make all") on the platform is also successful.
>
> When trying to execute cyclictest, the program reports: "Unable to
> change scheduling policy! either run as root or join realtime group"
>
> Looking in rt-utils.c, it appears that set_scheduler is unable to
> select SCHED_FIFO scheduling policy.
>
> Do you have any hints on how to fix this problem, or at least narrow
> it down further? Could it
>
Does "either run as root or join realtime group" fix the problem?
Sven
> Best Regards,
> Hartmut Behrens
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