linux-kernel - Re: Changing Kernel thread priorities

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Message-ID: <BANLkTiknwh4N3xRFQXYq0AFPc5BxWwUkuA@mail.gmail.com>
Date:	Tue, 7 Jun 2011 11:57:24 -0300
From:	Lucas De Marchi <lucas.de.marchi@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Remy Bohmer <linux@...mer.net>,
	Armin Steinhoff <armin@...inhoff.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Johannes Bauer <hannes_bauer@....at>,
	Monica Puig-Pey <puigpeym@...can.es>,
	Rolando Martins <rolando.martins@...il.com>,
	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Changing Kernel thread priorities

On Tue, Jun 7, 2011 at 11:14, Peter Zijlstra <peterz@...radead.org> wrote:
> > Well, I 100% agree that it must be under full userspace control to be
> > able to set the priorities. But, the kernel default assumption of
> > starting everything at 50 is wrong as well.
> > Imagine the following situation:
> > * Realtime application is running and has threads active in the range
> > of prios 20 - 90.
> > * Now bring up a network device, it immediately starts spamming the
> > system at prio 50 _before_ you have the chance to set it below 20 by
> > means of chrt.
> > * RT behaviour is gone!

Why is the application using priorities in the range 20-90 if it's
well known that we default RT kernel threads to 50?

IMO it's a mistake in the application.


Lucas De Marchi
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