* 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) {
Sebastian
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