linux-kernel - Re: CFS review

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Message-Id: <1185977074.2754.23.camel@laptopd505.fenrus.org>
Date:	Wed, 01 Aug 2007 07:04:34 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Roman Zippel <zippel@...ux-m68k.org>,
	Mike Galbraith <efault@....de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: CFS review


> but that's nothing new. CFS cannot conjure up time measurement methods 
> that do not exist. If you have a low-res clock and if you create an app 
> that syncs precisely to the tick of that clock via timers that run off 
> that exact tick then there's nothing the scheduler can do about it. It 
> is false to charachterise this as 'sleeper starvation' or 'rounding 
> error' like you did. No amount of rounding logic can create a 
> high-resolution clock out of thin air.


CFS is only as fair as your clock is good.


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