From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wolfgang Denk Mime-version: 1.0 Content-type: text/plain; charset=ISO-8859-1 Content-transfer-encoding: 8bit In-reply-to: Your message of "Wed, 26 Mar 2008 09:28:05 -0400." <47EA4F65.7050600@domain.hid> Date: Wed, 26 Mar 2008 17:20:10 +0100 Sender: wd@domain.hid Message-Id: <20080326162011.0040C243A7@domain.hid> Subject: Re: [Xenomai-core] Xenomai/SOLO - RTOS emulation for standard Linux List-Id: "Xenomai life and development \(bug reports, patches, discussions\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Steven A. Falco" Cc: xenomai@xenomai.org In message <47EA4F65.7050600@domain.hid> you wrote: > I'll of course have to make my own tests, but I am curious - do folks > expect that Xenomai/SOLO will be able to equal the interrupt performance > of Xenomai/IPIPE? I guess my intuition says that the IPIPE approach > would guarantee better interrupt response, but maybe my intuition is > completely wrong. I'll try to post some results in a few weeks... Well, interrupt performance is just one thing. The whole real-time behaviour depends on the underlying OS. And frankly, what we've seen so far means that PREEMPT_RT can deliver "probabilistic" real-time at best. Take a test case that has been running fine and just put it into a new environment (like attach it to a different network), and it will behave differently. Just plug in a new USB device that hasn't been tested before, and nobody can tell what will happen. If it comes to hard, reliable real-time behaviour, we recommend Xenomai/ipipe to all our customers. However, there are some who think it is important to have an "original, unpatched" kernel.org source tree. These obviously run for PREEMPT_RT, and SOLO. Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@domain.hid "You know, after a woman's raised a family and so on, she wants to start living her own life." "Whose life she's _been_ living, then?" - Terry Pratchett, _Witches Abroad_