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From: Lucas De Marchi <lucas.de.marchi@gmail.com>
Date: Tue, 7 Jun 2011 11:57:24 -0300
Message-ID: <BANLkTiknwh4N3xRFQXYq0AFPc5BxWwUkuA@mail.gmail.com>
Subject: Re: Changing Kernel thread priorities
To: Peter Zijlstra <peterz@infradead.org>
Cc: Remy Bohmer <linux@bohmer.net>, Armin Steinhoff <armin@steinhoff.de>,
        Thomas Gleixner <tglx@linutronix.de>,
        Johannes Bauer <hannes_bauer@aon.at>,
        Monica Puig-Pey <puigpeym@unican.es>,
        Rolando Martins <rolando.martins@gmail.com>,
        linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org
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On Tue, Jun 7, 2011 at 11:14, Peter Zijlstra <peterz@infradead.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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