From: "Remy Bohmer" <linux@bohmer.net>
To: "Jaswinder Singh" <jaswinderlinuxrt@gmail.com>
Cc: "Steven Rostedt" <rostedt@goodmis.org>,
"Arnaldo Carvalho de Melo" <acme@ghostprotocols.net>,
"Ingo Molnar" <mingo@elte.hu>,
"Juergen Beisert" <jbe@pengutronix.de>,
"Darren Hart" <dvhltc@us.ibm.com>,
linux-rt-users@vger.kernel.org,
"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 13:25:44 +0100 [thread overview]
Message-ID: <3efb10970712200425x4b0ffadcpd2ffa3223eda7b3d@mail.gmail.com> (raw)
In-Reply-To: <1985e0f60712200359k6194b0fdn25ead9b5c0835c95@mail.gmail.com>
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@gmail.com>:
> On 12/20/07, Remy Bohmer <linux@bohmer.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.
>
next prev parent reply other threads:[~2007-12-20 12:26 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 [this message]
2007-12-20 12:45 ` Jaswinder Singh
2007-12-20 12:50 ` Remy Bohmer
2007-12-20 13:18 ` Juergen Beisert
2007-12-20 13:40 ` Jaswinder Singh
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