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

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Date:	Tue, 17 Apr 2007 13:11:59 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andy Whitcroft <apw@...dowen.org>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Con Kolivas <kernel@...ivas.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 Tue, Apr 17, 2007 at 11:59:00AM +0200, Ingo Molnar wrote:
> 
> * Nick Piggin <npiggin@...e.de> wrote:
> 
> > 2.6.21-rc7-cfs-v2
> > 534.80user 30.92system 2:23.64elapsed 393%CPU
> > 534.75user 31.01system 2:23.70elapsed 393%CPU
> > 534.66user 31.07system 2:23.76elapsed 393%CPU
> > 534.56user 30.91system 2:23.76elapsed 393%CPU
> > 534.66user 31.07system 2:23.67elapsed 393%CPU
> > 535.43user 30.62system 2:23.72elapsed 393%CPU
> 
> Thanks for testing this! Could you please try this also with:
> 
>    echo 100000000 > /proc/sys/kernel/sched_granularity
> 
> on the same system, so that we can get a complete set of numbers? Just 
> to make sure that lowering the preemption frequency indeed has the 
> expected result of moving kernbench numbers back to mainline levels. (if 
> not then that would indicate some CFS buglet)
> 
> could you maybe even try a more extreme setting of:
> 
>    echo 500000000 > /proc/sys/kernel/sched_granularity
> 
> for kicks? This would allow us to see how much kernbench we lose due to 
> preemption granularity. Thanks!

Yeah but I just powered down the test-box, so I'll have to get onto
that tomorrow.
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