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From: Con Kolivas <kernel@kolivas.org>
To: Nick Piggin <npiggin@suse.de>
Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
Date: Wed, 18 Apr 2007 22:33:26 +1000
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Cc: Ingo Molnar <mingo@elte.hu>, Andy Whitcroft <apw@shadowen.org>,
       linux-kernel@vger.kernel.org,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Mike Galbraith <efault@gmx.de>, Arjan van de Ven <arjan@infradead.org>,
       Thomas Gleixner <tglx@linutronix.de>, Steve Fox <drfickle@us.ibm.com>,
       Nishanth Aravamudan <nacc@us.ibm.com>
References: <20070413202100.GA9957@elte.hu> <200704181933.57057.kernel@kolivas.org> <20070418121421.GB878@wotan.suse.de>
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On Wednesday 18 April 2007 22:14, Nick Piggin wrote:
> 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?

I said I wasn't pursuing it but since you're offering, the rc6 patch should 
apply ok.

http://ck.kolivas.org/patches/staircase-deadline/2.6.21-rc6-sd-0.40.patch

-- 
-ck