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On 1/22/2023 9:07 PM, Chen Yu wrote: > On 2023-01-20 at 17:09:28 +0800, Yicong Yang wrote: > [..snip..] > > This sounds reasonable to me. I think we can further enhance it. > And before you sending out the proposal, could you help test the following > experimental change, to see if it makes tbench netperf and MySQL better? > > Hi Prateek, could you also help check if below change would make the Spec regression > go away? Sure. I'll add this on top of v4 and queue some runs. Will share the results soon. > > thanks, > Chenyu > > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c > index fc8a636eca5e..6e1ab5e2686c 100644 > --- a/kernel/sched/fair.c > +++ b/kernel/sched/fair.c > @@ -4974,7 +4974,7 @@ wakeup_preempt_entity(struct sched_entity *curr, struct sched_entity *se); > static inline int is_short_task(struct task_struct *p) > { > return sched_feat(SIS_SHORT) && p->se.dur_avg && > - ((p->se.dur_avg * 8) <= sysctl_sched_min_granularity); > + ((p->se.dur_avg * 1024) <= (__this_cpu_read(sd_llc_size) * sysctl_sched_min_granularity)); > } > > /* -- Thanks and Regards, Prateek