From mboxrd@z Thu Jan 1 00:00:00 1970 From: Patrice Kadionik Subject: Re: preempt rt in commercial use Date: Tue, 14 Sep 2010 15:58:10 +0200 Message-ID: <4C8F7F72.1080206@enseirb-matmeca.fr> References: <201009141317.13439@zigzag.lvk.cs.msu.su> <20100914094411.GB10841@pengutronix.de> <4C8F67A6.1030409@steinhoff.de> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: linux-rt-users To: unlisted-recipients:; (no To-header on input) Return-path: Received: from plan.enseirb.fr ([147.210.18.60]:35132 "EHLO plan.enseirb.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753776Ab0INN6l (ORCPT ); Tue, 14 Sep 2010 09:58:41 -0400 Received: from localhost (mx [147.210.18.15]) by plan.enseirb.fr (8.13.8/8.13.8) with ESMTP id o8EDv94R005247 for ; Tue, 14 Sep 2010 15:57:09 +0200 (MEST) Received: from plan.enseirb.fr ([147.210.18.60]) by localhost (tan.enseirb.fr [147.210.18.15]) (amavisd-new, port 10041) with LMTP id FmJnu-wSHhSK for ; Tue, 14 Sep 2010 15:57:34 +0200 (MEST) Received: from [147.210.18.209] (pythagore [147.210.18.209]) (authenticated bits=0) from identified as kadionik by plan.enseirb.fr (8.13.8/8.13.8) with ESMTP id o8EDulP9005213 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=NO) for ; Tue, 14 Sep 2010 15:57:08 +0200 (MEST) In-Reply-To: <4C8F67A6.1030409@steinhoff.de> Sender: linux-rt-users-owner@vger.kernel.org List-ID: Le 14/09/2010 14:16, Armin Steinhoff a =E9crit : > Robert Schwebel wrote: >> On Tue, Sep 14, 2010 at 11:24:21AM +0200, Raz wrote: >>> anyone can say preempt rt is hard real time? >> Hard realtime has something to do with how you define "missing the >> deadline". If somebody cuts the cable of your roboter controller in = the >> factory hall, the system misses the deadline. So it is all about >> probabilities: hard realtime systems have a very, very low probabili= ty >> of missing the deadline. However, in real life systems, it is> 0%. >> >> So yes, if you talk about real world, it is hard realtime. >> > Hm, and what do think about that statement from FSMLabs: > > "Linux =93PREEMPT=94 real-time is a continuing experiment aimed at au= dio > and video playing with unreliable results and a detrimental affect on > =93enterprise=94 performance" Hello, "soft realtime vs hard realtime" will be the troll in the embedded=20 community for the next years after the "with or without MMU" troll... Patrice > > --Armin > > > --=20 > To unsubscribe from this list: send the line "unsubscribe=20 > linux-rt-users" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > --=20 Patrice Kadionik. F6KQH / F4CUQ ----------- +----------------------------------------------------------------------= + +"Tout doit etre aussi simple que possible, pas seulement plus simple" = + +----------------------------------------------------------------------= + + Patrice Kadionikhttp://www.enseirb.fr/~kadionik + + IMS Laboratoryhttp://www.ims-bordeaux.fr/ + + ENSEIRBhttp://www.enseirb.fr + + PO BOX 99 fax : +33 5.56.37.20.23 = + + 33402 TALENCE Cedex voice : +33 5.56.84.23.47 = + + FRANCEmailto:patrice.kadionik@ims-bordeaux.fr + +----------------------------------------------------------------------= + -- To unsubscribe from this list: send the line "unsubscribe linux-rt-user= s" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html