Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763472AbXLTNl4 (ORCPT ); Thu, 20 Dec 2007 08:41:56 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1763030AbXLTNkN (ORCPT ); Thu, 20 Dec 2007 08:40:13 -0500 Received: from hs-out-0708.google.com ([64.233.178.245]:13157 "EHLO hs-out-2122.google.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1763515AbXLTNkK (ORCPT ); Thu, 20 Dec 2007 08:40:10 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=EbXUfS4apk+bf2EVZKRjAt3jxkSYqULZXCZmDh1Bdxr0vu5z08sYs/eTQkbPj5HTGLsjiwc0kDJnWgc5M1Dgg1khyGsXQl74c/K6LfSd9MRf4M+9vqPqfpzvjQuDQGiiqZX3RJy6fjo0Pt89UNbRhLKZlv0DE6HC2FTCl6rh9uY= Message-ID: <1985e0f60712200540m1e499a77qaaff18d832c4b8f0@mail.gmail.com> Date: Thu, 20 Dec 2007 19:10:08 +0530 From: "Jaswinder Singh" To: "Juergen Beisert" Subject: Re: [patch 3/3] Enable setting of IRQ-thread priorities from kernel cmdline. (repost:CC to LKML) Cc: linux-rt-users@vger.kernel.org, "Remy Bohmer" , "Steven Rostedt" , "Arnaldo Carvalho de Melo" , "Ingo Molnar" , "Darren Hart" , "Sven-Thorsten Dietrich" , LKML In-Reply-To: <200712201418.17378.jbe@pengutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <20071219194551.315868746@bohmer.net> <3efb10970712200425x4b0ffadcpd2ffa3223eda7b3d@mail.gmail.com> <1985e0f60712200445o4f854cdep6eebf1726737229b@mail.gmail.com> <200712201418.17378.jbe@pengutronix.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1525 Lines: 44 hello Juergen, On 12/20/07, Juergen Beisert 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 > -- 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/