Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932233AbXLTM0A (ORCPT ); Thu, 20 Dec 2007 07:26:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757004AbXLTMZt (ORCPT ); Thu, 20 Dec 2007 07:25:49 -0500 Received: from py-out-1112.google.com ([64.233.166.180]:5001 "EHLO py-out-1112.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759976AbXLTMZr (ORCPT ); Thu, 20 Dec 2007 07:25:47 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth; b=DpaHFzDzmJJdkIsHFnx+yL2/JReItDPhTYIRt1/0uU10iC7rMqIYsSvs56Ok+KLeA/RBnYO/NsPWm4Zj2lELcGJ6P4+9WbA/QmxSHJepkZpTV06lWsGwvNoOl6nKImfGxPGJQMMrQQAjt9yCJPFnEB+EC8fyvSFYaM/UnYxmAUA= Message-ID: <3efb10970712200425x4b0ffadcpd2ffa3223eda7b3d@mail.gmail.com> Date: Thu, 20 Dec 2007 13:25:44 +0100 From: "Remy Bohmer" To: "Jaswinder Singh" Subject: Re: [patch 3/3] Enable setting of IRQ-thread priorities from kernel cmdline. (repost:CC to LKML) Cc: "Steven Rostedt" , "Arnaldo Carvalho de Melo" , "Ingo Molnar" , "Juergen Beisert" , "Darren Hart" , linux-rt-users@vger.kernel.org, "Sven-Thorsten Dietrich" , LKML In-Reply-To: <1985e0f60712200359k6194b0fdn25ead9b5c0835c95@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <20071219194551.315868746@bohmer.net> <47697888.143f420a.5466.ffff89ba@mx.google.com> <1985e0f60712200359k6194b0fdn25ead9b5c0835c95@mail.gmail.com> X-Google-Sender-Auth: d3eda966a0cccbea Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1330 Lines: 41 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 : > On 12/20/07, Remy Bohmer 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. > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/