Re: [ANNOUNCE] 4.4-rc6-rt1
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: 2016-01-14 14:17:48
Also in:
lkml
* 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