linux-kernel - Re: [REPORT] cfs-v4 vs sd-0.44

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Date:	Tue, 24 Apr 2007 17:07:35 +0200
From:	Rogan Dawes <lists@...es.za.net>
To:	Chris Friesen <cfriesen@...tel.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	Gene Heskett <gene.heskett@...il.com>,
	Juliusz Chroboczek <jch@....jussieu.fr>,
	Mike Galbraith <efault@....de>, linux-kernel@...r.kernel.org,
	Peter Williams <pwil3058@...pond.net.au>,
	ck list <ck@....kolivas.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	William Lee Irwin III <wli@...omorphy.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bill Davidsen <davidsen@....com>, Willy Tarreau <w@....eu>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [REPORT] cfs-v4 vs sd-0.44

Chris Friesen wrote:
> Rogan Dawes wrote:
> 
>> I guess my point was if we somehow get to an odd number of 
>> nanoseconds, we'd end up with rounding errors. I'm not sure if your 
>> algorithm will ever allow that.
> 
> And Ingo's point was that when it takes thousands of nanoseconds for a 
> single context switch, an error of half a nanosecond is down in the noise.
> 
> Chris

My concern was that since Ingo said that this is a closed economy, with 
a fixed sum/total, if we lose a nanosecond here and there, eventually 
we'll lose them all.

Some folks have uptimes of multiple years.

Of course, I could (very likely!) be full of it! ;-)

Rogan
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