Please create an account to participate in the Slashdot moderation system


Forgot your password?
Check out the new SourceForge HTML5 internet speed test! No Flash necessary and runs on all devices. ×

Comment Re:Unbelievable (Score 1) 124

Believe it or not, Comcast was a MAJOR upgrade from AT&T for me.

I used to have the @Home cable modem service and was quite pleased with it. This is before the days of Doxis and there was no throttling. My cable modem was capable of 10Mbps up and 10Mbps down. Later, @Home reduced it to 10Mbps down and 1Mbps up. Times were still good since that was an insane amount of bandwidth.

Then AT&T bought out @Home and switched it to AT&T Broadband Internet (ATTBI). They decided to reduce the upstream bandwidth to 128Kbps, but they aggregated all of the users through the SAME 128Kbps pipe. As a result, on the best of days I saw 40% packet loss with ping. My old 28.8Kbps modem was faster than my cable modem. It was like this for 9 months. Technical support was absolutely useless. There were newspaper articles about it but still the incompetence continued.

When Comcast took over things improved drastically. I will go out of my way to avoid anything to do with AT&T. While Comcast has a lot of problems, it is nothing like what I experienced with AT&T. AT&T was absolute shit.

Comment Re:one in every home? (Score 1) 227

The price of batteries is quickly dropping and there are other battery types that show promise for grid storage such as liquid metal batteries. It sounds like the main bottleneck now is the seals to keep air out, otherwise the batteries should be fairly inexpensive and use common materials. This article describes where things are at with liquid metal batteries.

Tesla has said that their grid batteries use NMC, nickel, manganese, cobalt and lithium. Lithium ion batteries typically contain only 3% lithium. The cells should support 5000 charge/discharge cycles, or over 13 years with full daily cycling.. Of course the cells won't be fully cycled every day so they should have a very long life.

Lithium typically is less than 1% the cost of the batteries.

Ethanol for energy storage will be extremely inefficient, especially when one takes into account the costs and energy to:
1. Extract CO2
2. Filter the water to remove contaminants
3. Generate the ethanol
4. separate ethanol from water (which tends to be energy intensive since ethanol loves water)
5. convert the ethanol back into electricity

Liquid metal batteries and pumped storage are currently around 70% efficient. Lithium ion batteries are over 90% efficient. Using ethanol will be significantly lower. Batteries will also require a lot less maintenance.

The efficiency increase from using batteries would more than pay for itself long-term since this option also will likely require a lot more maintenance.

Comment Re:one in every home? (Score 1) 227

The problem is that the efficiency is going to be significantly lower than the other two solutions you mentioned. Battery storage is extremely efficient and pumped storage also isn't too bad. Converting to ethanol is just the first half of the equation. Converting it back also needs to happen and there are significant losses there. The article also doesn't make any mention of efficiency, only of yields so my guess is that it isn't all that efficient.

Comment Re:Trump versus Clinton (Score 0) 500

Let's see. Hillary has repeatedly admitted that using a personal email server was a mistake. She has also admitted that the Iraq vote was also a mistake. She has admitted to numerous mistakes, meanwhile Donald's win-at-all-costs-I'm-perfect-trust-me has never admitted a mistake. Hillary has also admitted that some of the policies that were done when Bill was president did not work out so well. I see this as someone learning from their mistakes. Most people will learn from mistakes and move on.

Donald doesn't make mistakes. Failures are always somebody else's fault because he's perfect and such a great businessman that he loses almost a billion dollars while the economy is doing well. It's not his fault that he was sued by the justice department (under the Nixon administration, no less) for housing discrimination. It's not his fault that Trump Airlines went bankrupt, after all, turning a bottom feeder airline into a luxury airliner is sure to succeed, right? It's not his fault that his foundation funded his businesses with other people's donated money even though it was illegal for his foundation to collect money? It's not his fault that his casinos went bankrupt or that his father illegally bailed him out by buying chips. It's not his fault that he's so misogynous towards women, especially ones he doesn't think are pretty. It's also not his fault that most stuff he says is untrue. After all, Hillary is a liar compared to Trump.

If anyone feels they're entitled, it's the Donald because he's just perfect and can never do no wrong and is such an awesome businessman, after all, he always says, "Trust me."

Comment I've been working with this for a while (Score 5, Informative) 157

I have been working with 2.5G for around a year now using a 2.5G physical interface chip from Aquantia that seamlessly handles everything from 100Mbps to 10Gbps including 1G, 2.5G and 5G. If the cable isn't too long I've run 10G over cat 5. Hopefully the prices will drop quickly once more companies support this standard since I just bought the cheapest 2.5G switch I could find, 8 ports for around $1200 for development purposes. It also interoperates fine with standard 1G equipment.

Aquantia is also nice is that unlike many phy chip vendors their phy SDK is free as in beer and is fully GPL and BSD compatible, though it will need to be re-written for the Linux kernel to follow the guidelines. I re-wrote it for U-Boot though I won't be able to push it upstream for a while yet. The chip I'm using even supports MACsec in hardware. There were two different 2.5G proposals, one from Broadcom and one from Aquantia. The Aquantia is the one that ultimately got accepted as the standard.

Comment Re:No one likes (Score 2) 657

Remember, Trump solicited campaign contributions from foreign nationals. He has business interests all over the world, including many in Russia. His idea of a "blind trust" for his businesses is for his children to run them. There's no way Trump can avoid massive conflict of interests around the world. He's heavily indebted to Russian oligarchs and other areas that are in conflict with our national security.

Comment Re:Yeah but there's a whole world out there (Score 1) 867

I consider myself an exact opposite of a neocon, being fairly liberal, but I too have watched Russia's behavior under Putin with grave concern. The Frontline documentary, Putin's Way offers a glimps of the man and it isn't pretty. The former KGB agent is up to his eyeballs in corruption in a way mafia bosses could only dream of. What I find frightening is that Russia will basically run out of funds in the near future. His reaction to the resulting meltdown will not be pretty.

Slashdot Top Deals

When speculation has done its worst, two plus two still equals four. -- S. Johnson