linux-kernel - Re: Ten percent test

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Message-ID: <20070408105849.GA15764@elte.hu>
Date:	Sun, 8 Apr 2007 12:58:49 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Gene Heskett <gene.heskett@...il.com>
Cc:	linux-kernel@...r.kernel.org, Con Kolivas <kernel@...ivas.org>,
	Mike Galbraith <efault@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	ck list <ck@....kolivas.org>
Subject: Re: Ten percent test


* Ingo Molnar <mingo@...e.hu> wrote:

> > My question then, is why did it take a very public cat-fight to get 
> > this looked at and the code adjusted?  Its been what, nearly 2 years 
> > since Linus himself made a comment that this thing needed fixed.  
> > The fixes then done were of very little actual effectiveness and the 
> > situation then has gradually deteriorated since.
> 
> this is pretty hard to get right, and the most objective way to change 
> it is to do it testcase-driven. FYI, interactivity tweaking has been 
> gradual, the last bigger round of interactivity changes were done a 
> year ago:

and note that a year ago Mike did a larger patch too, not unlike his 
current patch - but we hoped that his smaller change would be sufficient 
- and nobody came along and said "i tested Mike's and the difference is 
significant on my system". Which seems to suggest that the number of 
problem-systems and worried users/developers isnt particularly large.

	Ingo
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