linux-kernel - Re: [RFC] scheduler: improve SMP fairness in CFS

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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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