linux-kernel - Re: CFS Scheduler and real-time tasks

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Message-ID: <20070517201338.GA1713@elte.hu>
Date:	Thu, 17 May 2007 22:13:38 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Török Edvin <edwintorok@...il.com>
Cc:	mingo@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: CFS Scheduler and real-time tasks


* Török Edvin <edwintorok@...il.com> wrote:

> On 5/17/07, Ingo Molnar <mingo@...e.hu> wrote:
> >
> >note: you ran it on a dual-core system and the SMP load-balancer needs
> >time to gain precision in the non-RT test - so i'd suggest to test it
> >much longer than 10 seconds: 300 seconds at least.
> 
> Thanks, running for 300 seconds shows only a 2% error. Even running a 
> I/O workload while running the massive_intr test keeps the same error.

hey, cool! Also try -v13 - it should be even more tighter.

> BTW, the system is more 'responsive'. For example starting 
> applications while running the tests, switching windows, moving 
> windows is much "smoother" than on default scheduler.

yeah :)

> [while true;do cp /usr/portage/distfiles/linux-2.6.21.tar.bz2 . && 
> sync && rm linux-2.6.21.tar.bz2 && sync; done]
> 
> ./massiv_new 9 300
> 020860  00017782
> 020858  00017774
> 
> RT JOB:020865   00003785
> 
> 020859  00017048
> 020862  00017387
> 020855  00017494
> 020861  00017245
> 020863  00017492
> 020864  00017122

looks pretty good!

	Ingo
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