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Date: Wed, 25 Jul 2007 16:55:05 -0400 From: Chris Snook <csnook@...hat.com> To: Chris Friesen <cfriesen@...tel.com> CC: Ingo Molnar <mingo@...e.hu>, Tong Li <tong.n.li@...el.com>, linux-kernel@...r.kernel.org Subject: Re: [RFC] scheduler: improve SMP fairness in CFS Chris Friesen wrote: > Ingo Molnar wrote: > >> the 3s is the problem: change that to 60s! We no way want to >> over-migrate for SMP fairness, the change i did gives us reasonable >> long-term SMP fairness without the need for high-rate rebalancing. > > Actually, I do have requirements from our engineering guys for > short-term fairness. They'd actually like decent fairness over even > shorter intervals...1 second would be nice, 2 is acceptable. > > They are willing to trade off random peak performance for predictability. > > Chris > The sysctls for CFS have nanosecond resolution. They default to millisecond-order values, but you can set them much lower. See sched_fair.c for the knobs and their explanations. -- Chris - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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