Messages in this thread | | | Date | Wed, 16 Aug 2023 11:20:33 +0200 | From | Peter Zijlstra <> | Subject | Re: [tip:sched/eevdf] [sched/fair] e0c2ff903c: phoronix-test-suite.blogbench.Write.final_score -34.8% regression |
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On Wed, Aug 16, 2023 at 11:40:33AM +0800, Chen Yu wrote:
> > Are these wakeup preemptions typically on runqueues that have only a > > single other task? > > > > There are 112 groups of hackbench waker/wakee on a 112 CPUs system. > Each group has 1 waker and 20 wakees. It seems that there are more than 1 > other task on each runqueue. I collected the statistics below.
Oh, I thought we were still talking about $subject benchmark. Yeah, hackbench has a ton of tasks.
> According to above data, maybe comparing the deadline does not take much > effect in this case(per 1).
Yeah, I stuck a trace_printk() in last night and quicly realized the lag is on the same order of request size, which then totally makes the whole thing moot.
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