linux-kernel - Re: [PATCH 6/6] sched: disabled rt-bandwidth by default

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Message-Id: <1219996607.5079.142.camel@marge.simson.net>
Date:	Fri, 29 Aug 2008 09:56:47 +0200
From:	Mike Galbraith <efault@....de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mark Hounschell <markh@...pro.net>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	Stefani Seibold <stefani@...bold.net>,
	Dario Faggioli <raistlin@...ux.it>,
	Max Krasnyansky <maxk@...lcomm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 6/6] sched: disabled rt-bandwidth by default

On Thu, 2008-08-28 at 14:53 -0400, Steven Rostedt wrote:
> On Thu, 28 Aug 2008, Linus Torvalds wrote:
> > 
> > And I'm not really interested. Quite frankly, I suspect the "we want to 
> > run something like pulseaudio with RT priorities" camp is the more common 
> > one, and in that context I understand limiting SCHED_FIFO sounds perfectly 
> > understandable.
> 
> The fact that it actually limits a SCHED_FIFO task group, over a single 
> task thread does bother me a little.

It bothers me some too.  You have to patch/re-compile the kernel if you
need to turn it off and don't have SCHED_DEBUG enabled (not free).

I tripped over this recently while regression testing.  I didn't expect
a gaggle of SCHED_RR tasks to be throttled on an otherwise idle box.
Hitting that perturbed test results in an unexpected manner, and sent me
off on a tangent.

	-Mike

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