From mboxrd@z Thu Jan 1 00:00:00 1970 From: Armin Steinhoff Subject: Re: preempt rt in commercial use Date: Tue, 14 Sep 2010 14:16:38 +0200 Message-ID: <4C8F67A6.1030409@steinhoff.de> References: <201009141317.13439@zigzag.lvk.cs.msu.su> <20100914094411.GB10841@pengutronix.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 moutng.kundenserver.de ([212.227.17.8]:65140 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753208Ab0INMOo (ORCPT ); Tue, 14 Sep 2010 08:14:44 -0400 In-Reply-To: <20100914094411.GB10841@pengutronix.de> Sender: linux-rt-users-owner@vger.kernel.org List-ID: 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 t= he > factory hall, the system misses the deadline. So it is all about > probabilities: hard realtime systems have a very, very low probabilit= y > 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 audi= o and video playing with unreliable results and a detrimental affect on =93enterprise=94 performance" --Armin -- 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