linux-kernel - Re: CFS review

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Date:	Thu, 2 Aug 2007 22:04:36 -0500
From:	Matt Mackall <mpm@...enic.com>
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

On Wed, Aug 01, 2007 at 01:22:29PM +0200, Ingo Molnar wrote:
> 
> * Roman Zippel <zippel@...ux-m68k.org> wrote:
> 
> > [...] e.g. in this example there are three tasks that run only for 
> > about 1ms every 3ms, but they get far more time than should have 
> > gotten fairly:
> > 
> >  4544 roman     20   0  1796  520  432 S 32.1  0.4   0:21.08 lt
> >  4545 roman     20   0  1796  344  256 R 32.1  0.3   0:21.07 lt
> >  4546 roman     20   0  1796  344  256 R 31.7  0.3   0:21.07 lt
> >  4547 roman     20   0  1532  272  216 R  3.3  0.2   0:01.94 l
> 
> Mike and me have managed to reproduce similarly looking 'top' output, 
> but it takes some effort: we had to deliberately run a non-TSC 
> sched_clock(), CONFIG_HZ=100, !CONFIG_NO_HZ and !CONFIG_HIGH_RES_TIMERS.

..which is pretty much the state of play for lots of non-x86 hardware.

-- 
Mathematics is the supreme nostalgia of our time.
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