On Wed, Jun 22, 2016 at 04:41:06PM +0200, Jirka Hladky wrote: > This commit is bad: > 2159197 - Peter Zijlstra, 8 weeks ago : sched/core: Enable increased > load resolution on 64-bit kernels > > Could you please have a look?
Yes, that is indeed the culprit. The below 'revert' makes it go fast again. I'll try and figure out what's wrong tomorrow. --- diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index bf6fea9..e7e312b 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -55,7 +55,7 @@ static inline void cpu_load_update_active(struct rq *this_rq) { } * Really only required when CONFIG_FAIR_GROUP_SCHED is also set, but to * increase coverage and consistency always enable it on 64bit platforms. */ -#ifdef CONFIG_64BIT +#if 0 // def CONFIG_64BIT # define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT + SCHED_FIXEDPOINT_SHIFT) # define scale_load(w) ((w) << SCHED_FIXEDPOINT_SHIFT) # define scale_load_down(w) ((w) >> SCHED_FIXEDPOINT_SHIFT)