Date: Wed, 25 Feb 1998 19:27:09 -0600 From: Dave Littell <dlittell@onramp.net> To: hackers@FreeBSD.ORG Subject: Re: Token Ring for FreeBSD yet? Message-ID: <34F4C4ED.31DFF4F5@onramp.net> References: <Pine.BSF.3.96.980224224016.306A-100000@duey.hs.wolves.k12.mo.us> <14181.888392839@verdi.nethelp.no>
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sthaug@nethelp.no wrote: > > > For example, can you guarantee, > > mathematically, that you can get a given mount of data across the network > > in a given amount of time, worst-case? Can't do that with Ethernet, since > > it works too chaotically. In token-passing and polling based networks, > > you can say with certainty that even under maximum load, you can get a > > packet from one machine to another in X milliseconds. > > Sorry, it's not that simple. On a token ring network, tokens can get lost. > Yes, this happens in real life. So any "guarantee" that you give for token > ring networks is based on statistics. > Yeah, it really is that simple. Token loss recovery time has an upper bound and token ring-based networks degrade gracefully, ensuring some non-zero throughput even at 100% offered load. I believe there are meltdown scenarios in Ethernet that guarantee you'll never get anything out. Dave To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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