From: Juergen Beisert <jbe@pengutronix.de>
To: linux-rt-users@vger.kernel.org
Cc: "Jaswinder Singh" <jaswinderlinuxrt@gmail.com>,
"Remy Bohmer" <linux@bohmer.net>,
"Steven Rostedt" <rostedt@goodmis.org>,
"Arnaldo Carvalho de Melo" <acme@ghostprotocols.net>,
"Ingo Molnar" <mingo@elte.hu>, "Darren Hart" <dvhltc@us.ibm.com>,
"Sven-Thorsten Dietrich" <sdietrich@novell.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [patch 3/3] Enable setting of IRQ-thread priorities from kernel cmdline. (repost:CC to LKML)
Date: Thu, 20 Dec 2007 14:18:16 +0100 [thread overview]
Message-ID: <200712201418.17378.jbe@pengutronix.de> (raw)
In-Reply-To: <1985e0f60712200445o4f854cdep6eebf1726737229b@mail.gmail.com>
On Thursday 20 December 2007 13:45, Jaswinder Singh wrote:
> On 12/20/07, Remy Bohmer <linux@bohmer.net> wrote:
> > So, Is this a serious requirement? Should this be possible?
>
> I have noticed this problem:
> root@192.168.1.253:~# cat /proc/loadavgrt
> 1.00 1.00 1.00 0/52 1158
> root@192.168.1.253:~# cat /proc/loadavg
> 0.00 0.00 0.02 1/52 1159
> root@192.168.1.253:~#
>
> So I am curious, if possible, user can switch softirq-threads or IRQs
> RT tasks to non-RT tasks for slow hardware or least important hardware
> for NON-RT tasks. So this will improve RT behaviour.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Why?
IMHO: Simply decrease the RT priority of less important IRQs or increase all
other more important IRQs. IRQs are always more important than other
processes in a system, also in non RT systems.
Juergen
--
Dipl.-Ing. Juergen Beisert | http://www.pengutronix.de
Pengutronix - Linux Solutions for Science and Industry
Handelsregister: Amtsgericht Hildesheim, HRA 2686
Vertretung Sued/Muenchen, Germany
Phone: +49-8766-939 228 | Fax: +49-5121-206917-9
next prev parent reply other threads:[~2007-12-20 13:19 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20071219194551.315868746@bohmer.net>
2007-12-19 19:45 ` [patch 1/3] Add generic routine for parsing map-like options on kernel cmd-line " Remy Bohmer
2007-12-19 21:00 ` Randy Dunlap
2007-12-19 21:44 ` Remy Bohmer
2007-12-19 19:45 ` [patch 2/3] Enable setting of IRQ-thread priorities from kernel cmdline " Remy Bohmer
2007-12-19 20:51 ` Randy Dunlap
2007-12-20 12:02 ` Jaswinder Singh
2007-12-19 19:45 ` [patch 3/3] Enable setting of IRQ-thread priorities from kernel cmdline. " Remy Bohmer
2007-12-19 20:55 ` Randy Dunlap
2007-12-20 11:59 ` Jaswinder Singh
2007-12-20 12:25 ` Remy Bohmer
2007-12-20 12:45 ` Jaswinder Singh
2007-12-20 12:50 ` Remy Bohmer
2007-12-20 13:18 ` Juergen Beisert [this message]
2007-12-20 13:40 ` Jaswinder Singh
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