Become a fan of Slashdot on Facebook


Forgot your password?
Note: You can take 10% off all Slashdot Deals with coupon code "slashdot10off." ×

Comment Re:Why IPv6 is broken (Score 1) 595

Easy: Just add prefixes to the numbers and everybody is happy. The old numbers stay valid, you can still connect within the old network(s), nobody has to remember new numbers.

You have no knowledge of IP have you ? To follow your telephony analogy: an "IPv4 telephone" can only dial numbers with exactly 10 digits. If you are going to expand the address space by adding a digit you will have to change all those "IPv4 phones".

Without the analogy: IPv4 addresses are 32 bit and every IPv4 stack defines them as 32 bit numbers. To address more than 2^32 nodes you will have to adapt every IPv4 stack and redefine addresses as something bigger, say 2^128. And that is exactly what IPv6 does.

When you redefine your address you will get incompatibility. A node which still has IP addresses defined as 32 bit will not be able to send replies to a node with a 2^128 address. The destination address simply does not fit in the defined address space. So while a node with an updated stack might be able to send traffic to a node without an updated stack that last one cannot send data back and you won't have meaningful communication.

That being the case it is better to make it clear that an expanded address space is incompatible with the current stacks. And that is exactly what has been done with IPv6.

Calling people morons without have any significant knowledge about the problem domain yourself is the real stupidity in your post. Dunningâ"Kruger in full effect

Comment Nice resolution (Score 2, Interesting) 96

But remembering interviews with Occulus developers there is more to VR than a good resolution and tracking. Things like ridiculous low latency needed to prevent motion sickness and screen artifacts caused by rapid panning. Has Valve solved these things in record time in secret or will this be a better specs on paper but worse in practice product ? Or maybe I'm just falling for Oculus marketing:

Comment Re:Hope it has GigE. (Score 1) 180

There is no 100MHz ethernet. There is 100Mbps ethernet that runs at 125MHz on copper with 4B/5B encoding (and MLT-3 to limit the bandwidth of the signal). The overhead is in ethernet and IP headers, preamble and interpacket gaps etc. Although the theoretical maximum efficiency for TCP on IP over ethernet with an IP MTU of 1500 is about 95% this is almost never reached due to latencies and suboptimal implementations etc. It's quite normal to get 90% maximum throughput in optimal situations.

Comment Re:Mass media takeover and destruction of 'net (Score 3, Insightful) 254

Luckily I don't see this attempt to turn internet into TV taking off. They really seem to see it as an alternative to IP instead of a service running on top of it like the web. IP6 is a really small change compared to it and look at the snales pace with which that is being rolled out.

Comment Re:So... providing electricity is easy, IT is hard (Score 1) 192

AC OP has overstated the simplicity of the electric grid but his main point is still valid. Power is a bit like cable TV, everybody gets the same subscriptions. People don't care what power plant has generated their energy. As long as power is available within certain parameters it's good. People do care a lot which bits they receive from a network. If they get their colleagues email instead of their own it's mostly worse than not getting email at all. The storage and processing of information is continually changing to adapt to needs of all kinds of organisations and people. If you compare the number of people working in electric utilities to the number of people working in IT I'd say IT is about 10 times as complex.

utility workforce
IT workforce http://www.globalization101.or...

Comment Re:Ubuntu + Battery = Not the best choice (Score 1) 208

I don't think even running a computer at full power all the time will make difference to the battery of a car. The engine of a car uses kilowatts and a PC watts. In other words a PC uses factor 1000 less than the rest of the car. Even if you could completely eliminate the power usage of the computer it will result in less than a mile extra range. So no "huge benefit" to be had. And where did you get the idea that this computer is always running even if the car is offline ? This computer is only for the entertainment system. As JB Straubel has said: "That's a key point. The whole entertainment system, those touchscreens, all of the applications you might load are totally separate from the propulsion of the car. In fact you could, if you had to, turn off the screens in the car while driving and the car still drives just fine."

Comment Re:No, UI designers went crazy. (Score 2) 503

The market for desktops and laptops is not going down the drain. A good part of activities that were performed on it have shifted to other form factors like tablets which offer a superior experience for those activities. Those activities are for a very big part media consumption. Media creation is largely still done on more traditional PC's and will in my opinion stay there for quite some time. The form factor and available software are not the only reason for this. The user interface is also a factor. When you are creating a document you don't want to move your fingers from the keyboard to the screen all the time. It is imprecise and touch obscures the part of the screen you're interacting with. Also a mouse has at least three actions under a click of a button. Much faster than using gestures. For a portable form factor touch makes sense since carrying a separate pointing device is awkward and you pretty much need a desk for a mouse or precision touch pad. Portable devices are limited in screen size by virtue of being portable. So it makes sense to run all apps full screen. Desktops are more and more using big screens and/or multiple screens. This lends itself to presenting all necessary data for a task at once in multiple programs. That does not work if all programs only want to display full screen or two programs at once maximum. Desktops and tablets are different things and are used in a different way. Forcing them to use the same tablet UI is as stupid as forcing flight yokes in cars because more people are flying these days.

"The geeks shall inherit the earth." -- Karl Lehenbauer