On Thu, 2016-01-14 at 15:17 +0100, Sebastian Andrzej Siewior wrote:
> * Sebastian Andrzej Siewior | 2016-01-13 18:58:45 [+0100]:
>
> > This is due to NO_HZ as far as I can tell. My AMD A10 in idle mode
> > has
> > 0.7% utilisation of ksoftirqd/ with CONFIG_HZ_PERIODIC and with
> > CONFIG_NO_HZ_FULL it shows about 25% on all CPU threads.
>
> This should fixed it:
>
> --- a/kernel/time/timer.c
> +++ b/kernel/time/timer.c
> @@ -1453,7 +1453,7 @@ u64 get_next_timer_interrupt(unsigned long
> basej, u64 basem)
> * the base lock to check when the next timer is pending and
> so
> * we assume the next jiffy.
> */
> - return basej;
> + return basem + TICK_NSEC;
> #endif
> spin_lock(&base->lock);
> if (base->active_timers) {
That's what I had done to stop the screaming interrupt, but box still
behaved very badly.
-Mike
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