linux-kernel - Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

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Date:	Wed, 18 Apr 2007 14:14:21 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Con Kolivas <kernel@...ivas.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Andy Whitcroft <apw@...dowen.org>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steve Fox <drfickle@...ibm.com>,
	Nishanth Aravamudan <nacc@...ibm.com>
Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

On Wed, Apr 18, 2007 at 07:33:56PM +1000, Con Kolivas wrote:
> On Wednesday 18 April 2007 18:55, Nick Piggin wrote:
> > Again, for comparison 2.6.21-rc7 mainline:
> >
> > 508.87user 32.47system 2:17.82elapsed 392%CPU
> > 509.05user 32.25system 2:17.84elapsed 392%CPU
> > 508.75user 32.26system 2:17.83elapsed 392%CPU
> > 508.63user 32.17system 2:17.88elapsed 392%CPU
> > 509.01user 32.26system 2:17.90elapsed 392%CPU
> > 509.08user 32.20system 2:17.95elapsed 392%CPU
> >
> > So looking at elapsed time, a granularity of 100ms is just behind the
> > mainline score. However it is using slightly less user time and
> > slightly more idle time, which indicates that balancing might have got
> > a bit less aggressive.
> >
> > But anyway, it conclusively shows the efficiency impact of such tiny
> > timeslices.
> 
> See test.kernel.org for how (the now defunct) SD was performing on kernbench. 
> It had low latency _and_ equivalent throughput to mainline. Set the standard 
> appropriately on both counts please.

I can give it a run. Got an updated patch against -rc7?

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