On Mon, Jul 27, 2009 at 01:57:31PM +0200, Denis Richard wrote: > Hi all, > We work on powerpc board with kernel 2.6.29.6-rt23. > The kernel is configured with "Complete Preemption (Real-Time)". > Working on our software, we have a strange behavior. > A real time thread (SCHED_RR) can be preempted by non real time one > (SCHED_OTHER). > > We wrote a little test program (at the end of this mail). > This program creates 2 threads, a SCHED_RR one which processes during > about 12s > (long for a real time, but just for test), and a SCHED_OTHER one, > started after the first one, > which just modifies a global variable. The second one should not run > during the execution of > the first one. But it appends, the global variable is modified. > > > rr_other > Create thread > OTHER ran during RR > The end > > > > Is it normal, a non real time thread preempts a real time one ? (we > think, it is not) > Or is there something wrong in the test program, the kernel > configuration, ... ? Does # echo -1 > /proc/sys/kernel/sched_rt_runtime_us help? Best regards Uwe -- Pengutronix e.K. | Uwe Kleine-König | Industrial Linux Solutions | http://www.pengutronix.de/ | -- 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
