linux-kernel - Re: question on sched-rt group allocation cap: sched_rt_runtime

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Date:	Mon, 07 Sep 2009 10:24:14 +0200
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ani <asinha@...gmasystems.com>,
	Lucas De Marchi <lucas.de.marchi@...il.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: question on sched-rt group allocation cap: sched_rt_runtime_us

On Mon, 2009-09-07 at 09:59 +0200, Peter Zijlstra wrote:
> On Sun, 2009-09-06 at 08:32 +0200, Mike Galbraith wrote:
> > On Sat, 2009-09-05 at 19:32 -0700, Ani wrote: 
> > > On Sep 5, 3:50 pm, Lucas De Marchi <lucas.de.mar...@...il.com> wrote:
> > > >
> > > > Indeed. I've tested this same test program in a single core machine and it
> > > > produces the expected behavior:
> > > >
> > > > rt_runtime_us / rt_period_us     % loops executed in SCHED_OTHER
> > > > 95%                              4.48%
> > > > 60%                              54.84%
> > > > 50%                              86.03%
> > > > 40%                              OTHER completed first
> > > >
> > > 
> > > Hmm. This does seem to indicate that there is some kind of
> > > relationship with SMP. So I wonder whether there is a way to turn this
> > > 'RT bandwidth accumulation' heuristic off.
> > 
> > No there isn't..
> 
> Actually there is, use cpusets to carve the system into partitions.

Yeah, I stand corrected.  I tend to think in terms of the dirt simplest
configuration only.

	-Mike

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