I've recompiled the 3.16.7 kernel with the NO_HZ_FULL option enabled and /proc/interrupts shows roughly 1 tick every 3 seconds on an isolated core and a process affined to a core
I still see jitter though. Obtaining TSC values in a tight loop reports 5-20 usecs latencies approximately 30 times per second Unfortunately ftrace does not show anything unusual - I can see apic_timer_interrupt fires every 2.5 seconds followed by the reschedule in approx 0.5 seconds but nothing in between perf also does not show anything of interest apart from an unusually high LLC miss rate If it is of any help the jitter seems to be evenly spread over 1 sec interval Please suggest what else to look for Regards Konstantin -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
