On Tue, 29 Dec 2015, Helge Deller wrote: > No, the patch below doesn't help. > > I still see: > [ 644.916000] timerfd_settime: interval (sec=0, nsec=100000000) it_value (sec=0, nsec=100000000) > [ 645.024000] timerfd_gettime: interval (sec=0, nsec=100000000) it_value (sec=0, nsec=103029949) > Right. It can't help. Sorry for the distraction. Looking deeper I found the issue. It's caused by CONFIG_TIME_LOW_RES. See the comment in hrtimer_start_range_ns(). We round the expiry time to the next jiffies period to avoid short timeouts. Assuming you are running with HZ=250 this is exactly 4ms. So that's where your extra time comes from. Not sure what to do about that. Thanks, tglx -- To unsubscribe from this list: send the line "unsubscribe linux-parisc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
