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

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Date:	Wed, 25 Apr 2007 09:55:55 +1000
From:	Peter Williams <pwil3058@...pond.net.au>
To:	Rogan Dawes <lists@...es.za.net>
CC:	Chris Friesen <cfriesen@...tel.com>, 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,
	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

Rogan Dawes wrote:
> 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! ;-)

And won't be using the any new scheduler on these computers anyhow as 
that would involve bringing the system down to install the new kernel. :-)

Peter
-- 
Peter Williams                                   pwil3058@...pond.net.au

"Learning, n. The kind of ignorance distinguishing the studious."
  -- Ambrose Bierce
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