Messages in this thread | | | Date | Fri, 24 Jun 2016 17:54:34 +0200 | From | Peter Zijlstra <> | Subject | Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel |
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On Fri, Jun 24, 2016 at 03:42:26PM +0200, Peter Zijlstra wrote: > On Fri, Jun 24, 2016 at 02:44:07PM +0200, Vincent Guittot wrote: > > > --- a/kernel/sched/fair.c > > > +++ b/kernel/sched/fair.c > > > @@ -2484,7 +2484,7 @@ static inline long calc_tg_weight(struct task_group *tg, struct cfs_rq *cfs_rq) > > > */ > > > tg_weight = atomic_long_read(&tg->load_avg); > > > tg_weight -= cfs_rq->tg_load_avg_contrib; > > > - tg_weight += cfs_rq->load.weight; > > > + tg_weight += cfs_rq->avg.load_avg; > > > > IIUC, you are reverting > > commit fde7d22e01aa (sched/fair: Fix overly small weight for > > interactive group entities) > > Hurm.. looking at that commit again, that seems to wreck > effective_load(), since that doesn't compensate. > > Maybe I'll remove calc_tg_weight and open code its slightly different > usages in the two sites.
OK, sorry for not actually posting, but I need to run. Please find the two patches in:
git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/urgent
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