Lei Zhao wrote: > Hi, I've been looking into a variety of Real-Time Ethernet protocols > and was delighted to find an open source project on Sourceforge. I > have two questions in mind: > > > (1) I have not seen any performance results for RTnet, is there any > available or under way? Or would I have to do that myself?
As RTnet is a software solution, performance (whatever one means with it precisely) heavily depends on the execution platform AND the system setup (real-time task schedule, IRQ schedule). Yes, if you plan to use RTnet for some concrete scenario, it is mandatory to do your own benchmarks on YOUR platform. There are a few benchmarks around on the web, many in German only :-/. But I heard rumours there are more on the way, also in English. I can only motivate anyone having written a paper, a thesis, or whatever publicly accessible document about RTnet evaluations to drop a note and attach a link etc. so that we can collect those references (e.g. in the wiki). > > (2) In conducting a literature search, I found a paper published by > Fred Hanssen and others at the University of Twente, entitled "RTnet: > a distributed real-time protocol for broadcast-capable networks." In > it, they describe a protocol which is software-only on top of standard > COTS Ethernet, but uses a token passing method. From what I've read on > the website and Kiszka's paper in 2005, it seems that Sourceforge's > RTnet employs a master-slave TDMA method. Am I missing something here? > Hanssen's paper is here: > > http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1559870 > Yes, we are very aware of this unfortunate name collision. The open source project RTnet dates back to 2000, but in 2003 the Twente group decided to rename their multimedia soft-realtime protocol to "RTnet" as well. I informed them about the clash and the history of this name, but I never received any reply nor did they changed their naming. Jan
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