Jan Kiszka wrote: > Sebastian Smolorz wrote: > > However, there is one disturbing issue. When I execute > > > > dd if=/dev/zero of=/dev/null > > > > and the latency test in userspace with a period not less than 150 us the > > worst case latency is about 220 us. But when I start latency with -p 100 > > I get a softlock like the one attached. I guess this is the same problem > > as Detlef Vollmann described in [2]. So I think it's time for a big fat > > ARM-specific warning in the troubleshooting file and perhaps a > > modification of the testsuite so that if being compiled for ARM the > > default sample periods are greater than the 100 us now. > > Something is preventing the watchdog kthread from being executed for > more than 10 s. Maybe this is just a sign that the systems is hopelessly > overloaded (what are average latencies?).
They are 120-130 us. > Maybe it is a real IRQ or > scheduling issue in Linux caused by I-pipe. Maybe it is time to port the > I-pipe tracer... ;) With the latest Adeos upgrade for ARM the I-pipe tracer was integrated, wasn't it? I was already taking its usage into account. Sebastian _______________________________________________ Xenomai-core mailing list [email protected] https://mail.gna.org/listinfo/xenomai-core
