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

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Message-ID: <462E1C2E.30406@nortel.com>
Date:	Tue, 24 Apr 2007 09:03:10 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Rogan Dawes <lists@...es.za.net>
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

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
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