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2000/3/21-23 [Science/GlobalWarming, Computer/Networking] UID:17813 Activity:very high |
3/20 Our current DSL service (bjt.net) sucks. We need a good, high-bandwidth (1-2 megabits) DSL connection that has high uptime and a consistently low latency. Anyone have good experiences? -blojo \_ low latency's determined by the speed of light (I don't know of anyone who can change that yet) and distance to whatever you're trying to connect to. So low latency to connect to what site? And maybe queueing theory comes into play but that's a different story. Latency usually isn't an issue in networks (except for UDP packets). It's usually bandwidth that's important. \_ Hello, I am not a dumbass. Our problem is that the ATM cloud we're fed into seems to be oversold. So, yes, queueing theory comes into play here. You need to have a higher level of expectation regarding the intelligence/experience of people on soda. See oj's comment below. -blojo \_ Say, blojo, do you have some sort of complex? You blow up everytime your overactive imagination perceives anyone even slightly hinting that you may be a DUMBASS. \_ I don't have a complex insofar as I am aware. I was just astonished by the lameness of the post by someone who seemed to think they just knew A WHOLE LOT. Uhh my imagination may be overactive but I tend to use that \_ Latency is HARDLY AT ALL determined by the speed of light. RTTs energy imagining more interesting things than motd posts. -blojo \_ It's the twink-point effect, I'm telling you. Just as intended. \_ Sign your posts, so everyone can know how dumb you are --oj \- when you start pushing ATM a lot of the abstraction breaks down and in specific areas the fundmaental technology difference matters. when you are pushing the switch, it may really start to matter how much bcast traffic or what kind of packet dropping heuristics they are using inside the switch to manage the buffering. this is hard even in the \_ Well, let's see. If the speed of light were 200mph, then I think you'd see a lot more latency. (And find it very hard to read, drive, fly, or many other things, but point made via hyperbole). \_ This is the real world we live in not your dream. In reality the speed of light is not the limiting factor in network speeds. That you felt the need to pull this 200 number out of the air merely shows how little your point has to do with reality. packet switching world ... with the weird atm signalling protocols this stuff can be really hard to do right --psb \_ Latency is not determined solely by the speed of light. \_ Latency is NOT AT ALL determined by the speed of light. RTTs from here to the east coast are what, now, ~200ms?--but many times what it would take for light to travel there and back round trip. Latency is determined by the speed of switching electronics, which is much slower than light. \- in case your are interested, RTT to the east coast is higher than a lot of people think. say distance is 3000x2 mi and speed of light in glass is around 186288 x 60% =111800mps latency inside a switch is pretty small. most people use a send/recd buffer much smaller than the bw delay product so you are very much underfilling an empty pipe. --psb \_ Actually, deep down the speed of light is the limiting factor if you consider that the network switches are literally a bunch of NMOS and PMOS transistors hooked up together through polysilocon and metal layers and that electron mobility is limited by the speed of light which in turn limits the speed by which logic circuits operate then yes, the speed of light is a limiting factor. Besides, if you read carefully, the original poster never said that the speed of light was THE SOLE limiting factor. \_ "low latency's determined by the speed of light." Looks like he came as close as you can to saying that to me. \_ Can you read or are you just and idiot? "low latency's determined by the speed of light AND however many hops you're trying to get to." I'm not going to quote exactly because I'm too lazy to scroll up just for this stupid post. \_ Just an idiot. \_ BINGO! The other guy is a moron, though. Of course the speed of light has something to do with it. What a serious super-duh to say it doesn't. _That_ was the point I was making with the extreme 200mph example. It *matters*. If sound went faster than light, we'd be using that instead (somehow). Join the rest of us in the real world where the SoL does matter. \_ Did you pass high school physics? \_ Sure did. You pass HS English? \_ http://tycho.net serve your area? \_ FirstWorld (formerly slipnet) seems okay to me. BBNPlanet was pretty good too. |
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