linux-kernel - Re: realtime preemption performance difference

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Message-ID: <20070926111744.GA18438@in.ibm.com>
Date:	Wed, 26 Sep 2007 16:47:44 +0530
From:	ankita@...ibm.com (Ankita Garg)
To:	Jaswinder Singh <jaswinderlinux@...il.com>
Cc:	hufey <hufeyy@...il.com>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, dmitry.adamushko@...il.com, a.p.zijlstra@...llo.nl,
	randy.dunlap@...cle.com, efault@....de, akpm@...ux-foundation.org,
	vatsa@...ux.vnet.ibm.com, dhaval@...ux.vnet.ibm.com
Subject: Re: realtime preemption performance difference

Hi Jaswinder,

On Wed, Sep 26, 2007 at 12:41:57PM +0530, Jaswinder Singh wrote:
> hello hufey,
> 
> I am not using montavista kernel, I am using standard linux kernel.
> 
> Realtime is known by worst case latencies. Ingo and team are claiming
> for realtime support so their should be some samples and performance
> numbers,
> 

You can obtain several -rt testcases from the RT wiki:
http://rt.wiki.kernel.org/index.php/Main_Page Here we have testcases/benchmarks 
for measuring scheduling latencies, priority preemption, signaling latencies, etc 
and other important information on the patchset.

Hope this helps!

> Can someone please share their samples and/or numbers.
> 
> Thank you,
> 
> Jaswinder Singh.
> 
> On 9/25/07, hufey <hufeyy@...il.com> wrote:
> > On 9/24/07, Jaswinder Singh <jaswinderlinux@...il.com> wrote:
> > > Hi all,
> > >
> > > I want to check performance difference by using realtime preemption patch :
> > >
> > > http://www.kernel.org/pub/linux/kernel/projects/rt/
> > >
> > > Please let me know from where I can download samples to test realtime
> > > preemption performance difference.
> > >
> >
> > As far as I know, some embedded linux vendors such as MontaVista
> > provide kernel patch to export some interfaces to measure realtime
> > performance.
> >
> > > Can someone please share performance numbers for your hardware:-
> > >
> > > 1. Interrupt latency
> > > 2. Task switching time
> > > 3. hard-realtime scheduling latency
> > >
> > > Thank you,
> > >
> > > Jaswinder Singh.
> > > -
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> > >
> >
> -
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> 

-- 
Regards,
Ankita Garg (ankita@...ibm.com)
Linux Technology Center
IBM India Systems & Technology Labs, 
Bangalore, India   
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