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Free IPv4 Pool Now Down To Seven /8s

mpsheppa Re:NAT! (460 comments)

Not to mention, unless I'm much mistaken a NAT can support 65536 connections at maximum

This is not true, at least for TCP connections. While many implementations might have this limit for simplicity sake, there is no actual reason why you can't use the same local port for different destinations, e.g. TCP port 1000 could have active connections to www.slashdot.org on port 80 and to www.microsft.com on port 80 and there is sufficient information in each packet to work out which of those two connections each packet belongs to. You see this type of multiplexing in reverse on servers where port 80 might have thousands of connections to it active at once.

about 4 years ago
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Intel Talks 1000-Core Processors

mpsheppa Re:Seriously? (326 comments)

Intel is already doing this to some extent with their Turbo Boost technology. You can run one core at the fastest clock rate allowed by the heat envelope of the CPU, two cores slightly slower or four even slower cores. It certainly isn't taking it to the extent that you suggest, but it is heading in that direction.

With their next generation Sandy Bridge architecture they are taking it a bit further and if the cores are cooler because they have been running idle for a while then it lets them run even faster for a short period of time until they head up again.

It is all about heat these days and in order for all those slow cores to be helpful, they need to have significantly better computation per watt ratio than the big fast cores AND we need OSs and/or hypervisors that understand how to use a mix of fast and slow cores.

about 4 years ago
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Wind Farms To Receive Future Wind Forecasts

mpsheppa Re:Effect of windmills on wind? (57 comments)

Maybe - see http://www.computing.co.uk/business-green/news/2231469/wind-turbines-mess-weather for example.

However, the effect is debatable, with no consensus on what it will be and whether it would be negative. If we were getting to 50% wind power then I'd want to see more research on the possible effects, but I can't see it having any noticeable impact one way or the other any time soon.

more than 5 years ago
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Fusion-Fission System Burns Hot Radioactive Waste

mpsheppa Re:Weapons Grade Production? (432 comments)

For example, a single terrorist nuclear incident would probably result in marshal law within the US, an escalation of our military, and a massive retrenchment of the world economy. Even if this as a 1% chance, the cost is so great that one must account for it. One percent of 100 trillion dollars in cumulative loss over the ensuing 50 years (not even accounting for loss of life) is $1T.

I think that you overstate the effect and the chance, but yes, this is indeed a cost that needs to be taken into account. However, what we are comparing to is coal-fired power plants. These also do massive damage - it is just less obvious. I won't try to put a number on it, but greenhouse effects could easily cause a loss of well over 1% of GDP even in a moderately bad scenario. I don't want to think about worst cast. Then there's the mining, particle pollution and mercury that coal has to deal with.

Further, nuclear energy economic models assume centralized power generation. That is a poor approach, an industrial age approach. We need to get away from that and move power generation closer to where power is used.

Yes, decentralized generation can be good when it works, but why do we need it? You say yourself that high-voltage transmission is very efficient, so why?

I don't feel that nuclear is a choice. It is too dangerous. In my opinion, it needs to be off the table as an option. If it did not exist, we would find a way and we would be fine.

I don't feel that coal is a choice. It is too dangerous. In my opinion, it needs to be off the table as an option. If it did not exist, we would find a way and we would be fine.

It would be great if solar and wind could produce all our power requirements and maybe one day they will, but I feel that that's a long time away and if that leaves us with a choice between coal and nuclear then I'd definitely support the nuclear option.

more than 5 years ago
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Networked Fridges 'Negotiate' Electricity Use

mpsheppa Re:How does this actually solve a problem? (217 comments)

That's because the point of technology is not to enforce the levelness on the grid. The idea would be to anticipate the time of peak demand, cool all of the fridges down before this time starts, so that they can all stay off during peak load. Alternatively, if the peak load spikes unexpectedly or power production drops unexpectedly then the fridges could switch off to allow the available power to be used for other purposes. This would mean two things. Firstly, less peak capacity would be required which reduces infrastructure costs. Secondly, it allows renuable energy sources to be used to a greater extent in the grid. Generally with renuable energy you have no control over production, so being able to control consumption instead means that a greater percentage of renuable sources can be used instead.

more than 5 years ago
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Saving Energy Via Webcam-Based Meter Reading?

mpsheppa Re:Touchy, feely. (215 comments)

I'd put an induction clamp onto the line in my box and get the data from that point.

Hard to do that with Gas, though.

Plus, you'd have to measure the main (not impossible, but it might be harder to find a clamp-on inductive ammeter that's easy to interface with a computer), and you'd have to monitor it *continuously* in order to integrate over time. Whereas the webcam can even sit powered off for most of the day, and just be activated long enough to grab an image of the dials.

Even worse that that, you won't even get the correct result because of power factor effects.

more than 6 years ago

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