From mboxrd@z Thu Jan 1 00:00:00 1970 From: "K.R. Foley" Subject: Re: Why is Linux not RTOS? Date: Wed, 30 May 2007 20:16:22 -0500 Message-ID: <465E21E6.4050904@cybsft.com> References: <7783925d0704040521q3755394uf774884b5298eec2@mail.gmail.com> <7783925d0704040605s4590d421y39ae5b13a020a8a@mail.gmail.com> <200704051236.29847.Tzahi.ML2@gmail.com> <1180486056.5473.28.camel@localhost.localdomain> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1180486056.5473.28.camel@localhost.localdomain> Sender: kernelnewbies-bounce@nl.linux.org Errors-to: kernelnewbies-bounce@nl.linux.org List-help: List-unsubscribe: List-software: Ecartis version 1.0.0 List-Id: List-subscribe: List-owner: List-post: List-archive: Content-Type: text/plain; charset="us-ascii" To: rrbranco@br.ibm.com Cc: Raseel Bhagat , kernelnewbies@nl.linux.org, linux-newbie@vger.kernel.org Rodrigo Rubira Branco wrote: > Ok, let's clarify somethings ;) Please don't top post. > > > First of all I really recommend this links: > http://www.linuxjournal.com/article/9361 > http://rt.wiki.kernel.org/ > > The real-time implementations previously commented in the list relies on > "interrupt shielding" (forcing interrupts to run on a reserved CPU) and > "CPU pinning" (forcing real-time tasks to only run on a CPU which > doesn't run any other tasks), so we can't say it's a 'real' real-time ;) > (it does not take the best advantage of multiple cpu's for example and > needs more than just one in anyway). The above description is inaccurate when talking about about Ingo Molnar's PREEMPT_RT or Real-Time patch. The -rt patchset, as it is also called, takes full advantage of SMP capabilities for both interrupts and Real-Time tasks. > > Legal notice: It's just my personal contribution. > > > P.S.: Sorry my delay to answer that ;) > > > On Thu, 2007-04-05 at 15:37 +0530, Raseel Bhagat wrote: >> Hi Tzahi, >> >> On 4/5/07, Tzahi Fadida wrote: >>> What is this i hear about PREEMT_RT from VirtualLogix: >>> http://www.wirelessiq.com/content/newsfeed/9867.html >> I think the author is trying to mention the different innovative >> solutions to the latency issue in the GPOS Linux Kernel. PREEMPT_RT , >> IIRC was a Real Time patch by Ingo Molar. >> VirtualLogix's Virtual OS is another such solution, etc. >> >> Thanks, >> Raseel >> - >> To unsubscribe from this list: send the line "unsubscribe linux-newbie" 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.linux-learn.org/faqs -- kr -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@nl.linux.org Please read the FAQ at http://kernelnewbies.org/FAQ