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 13:25:44 +0100
From:	"Remy Bohmer" <linux@...mer.net>
To:	"Jaswinder Singh" <jaswinderlinuxrt@...il.com>
Cc:	"Steven Rostedt" <rostedt@...dmis.org>,
	"Arnaldo Carvalho de Melo" <acme@...stprotocols.net>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Juergen Beisert" <jbe@...gutronix.de>,
	"Darren Hart" <dvhltc@...ibm.com>, linux-rt-users@...r.kernel.org,
	"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 Jaswinder,

> Is it possible to run softirq-threads or IRQs as a non-realtime tasks
> in RT kernel.

Currently the answer is no. (Unless overruled from userspace) I did
not take this requirement into account.
So, Is this a serious requirement? Should this be possible?
I cannot imagine a purpose in which that is wanted, it would cause
unpredictable interrupt handling, and I can imagine that many
drivers/devices will not like that.

The purpose is usually to spread the threads across several
priorities, to create room for some RT-process to become more
important than an IRQ that generates large latencies, and each
RT-system designer shall divide the priorities different, due to
different system requirements.

Kind Regards,

Remy

2007/12/20, Jaswinder Singh <jaswinderlinuxrt@...il.com>:
> On 12/20/07, Remy Bohmer <linux@...mer.net> wrote:
> > The RT-patch originally creates all its softirq-threads at
> > priority 50.
>
> Is it possible to run softirq-threads or IRQs as a non-realtime tasks
> in RT kernel.
>
> If yes, then how.
>
> Thank you,
>
> Jaswinder Singh.
>
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