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Message-ID: <46A7B4DE.4030301@nortel.com>
Date: Wed, 25 Jul 2007 14:38:54 -0600
From: "Chris Friesen" <cfriesen@...tel.com>
To: Ingo Molnar <mingo@...e.hu>
CC: Tong Li <tong.n.li@...el.com>, linux-kernel@...r.kernel.org,
Chris Snook <csnook@...hat.com>
Subject: Re: [RFC] scheduler: improve SMP fairness in CFS
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
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