Hi, On Wed, Mar 24, 2010 at 2:22 PM, M. Koehrer <mathias_koehrer@xxxxxxxx> wrote: > Does it help to run the posix threads with realtime priority by calling > pthread_setschedparam() with SCHED_FIFO and a suitable priority? > As fas as I understand your code, the threads run with standard (non realtime > priority). Yes. I tried this with a chrt -f 99. But I still end up getting those large deviations. John, mq_timedrecieve takes abstime. Isnt it supposed to be CLOCK_REALTIME ? Anyway, I tried with MONOTONIC .. mq_timedrecieve doesnt block on that. I was just looking at some code in the kernel. linux/ipc/mqueue.c +442. This line says: time = schedule_timeout(timeout); Maybe this is why produces a timeout that is inaccurate. Shouldnt it be schedule_hrtimeout ? regards /prady -- http://www.prady.in -- 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
