linux-kernel - Re: [patch 3/3] Enable setting of IRQ-thread priorities from kernel cmdline. (repost:CC to LKML)

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Date:	Thu, 20 Dec 2007 19:10:08 +0530
From:	"Jaswinder Singh" <jaswinderlinuxrt@...il.com>
To:	"Juergen Beisert" <jbe@...gutronix.de>
Cc:	linux-rt-users@...r.kernel.org, "Remy Bohmer" <linux@...mer.net>,
	"Steven Rostedt" <rostedt@...dmis.org>,
	"Arnaldo Carvalho de Melo" <acme@...stprotocols.net>,
	"Ingo Molnar" <mingo@...e.hu>, "Darren Hart" <dvhltc@...ibm.com>,
	"Sven-Thorsten Dietrich" <sdietrich@...ell.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch 3/3] Enable setting of IRQ-thread priorities from kernel cmdline. (repost:CC to LKML)

hello Juergen,

On 12/20/07, Juergen Beisert <jbe@...gutronix.de> wrote:
> On Thursday 20 December 2007 13:45, Jaswinder Singh wrote:
> > 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.
>

In RT Kernel we have :-
RT Tasks and Non-RT tasks.

So we can also support :-
RT softirq-threads/IRQs and non-RT softirq-threads/IRQs

So RT softirq-threads/IRQs for RT Tasks
and non-RT softirq-threads/IRQs for non-RT Tasks.

OR also remove Non-RT tasks from RT Kernel and simply decrease the RT
priority of less important task as per your suggestions.

Thank you,

Jaswinder Singh.

> 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
>
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