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Solar Plant Sets Birds On Fire As They Fly Overhead

six Re:Insignificant...unless you're the bird (521 comments)

Personally I can't understand why it's ok to negligently allow birds to hunt billions of insects and earthworms, but apparently society is fine with that.

about 3 months ago

Philips Ethernet-Powered Lighting Transmits Data To Mobile Devices Via Light

six Re:What is old is new again (104 comments)

You'd only need a super high fps device that detects on/off state of the light, which I guess would be a lot easier and cheaper than a real camera.

about 5 months ago

Bitcoin Tops $1,000 For the First Time

six Re: (371 comments)

Forget CPU and GPU already. The mining difficulty has risen so much recently that what you can mine with them today won't event offset the power costs.

ASICs are the only viable option today for at-home mining, but I'm pretty sure they'll also be rendered useless soon by hosted mining services (CEX.IO already has 25% of the whole Bitcoin network mining power) that are able to consolidate costs and run their mining farms in countries with cheap electricity.

about a year ago

The Strange Nature of the Nigerian App Market

six Re:Aint no fool (110 comments)


97.3% of statements starting with "Fact:" are actually repeated talking points supported by absolutely no real fact.

more than 2 years ago

World's Most Powerful x86 Supercomputer Boots Up in Germany

six Re:Q: Why are we still on x86 and 64bit and not 12 (151 comments)

Don't mix up addressing and computing.

The whole internet would fit in a 64 bit address space, there is really absolutely no need at all for more than 64 bit for addresses in CPUs, that's why x86_64 and other 64 bit archs are here to stay, and you'll probably never see "128 bit" processors at all.

On the other side, today's x86_64 CPUs are capable of 128 bit (SSE) and 256 bit (AVX) computing. The width of the compute units is also bound to increase for some time, with Intel already planning to go 1024 bit in the not-so-far future.

more than 2 years ago

World IPv6 Launch Day Underway

six Re:slashdot? (236 comments)

Apparently not today.

Checking for AAAA DNS record
no AAAA record

more than 2 years ago

Ask Slashdot: Life After Firefox 3.6.x?

six Re:Not an issue (807 comments)

i686 because I don't see a reason to run x86_64 on 2GB of RAM

x86_64 IA would provide a noticeable performance improvement for some apps, even if you had 640Kb of RAM. It's not only 64-bit addressing but also 64-bit registers (and more of them), 64-bit ALUs, an so on ...

more than 2 years ago

Intel Announces Xeon E5 and Knights Corner HPC Chip

six Re:How can that be? (122 comments)

The vector unit must be FMA capable just like Larrabee, hence the doubling of FLOPS/cycle.

about 3 years ago

Ask Slashdot: Best Connect Scheme For a 2-ISP Household?

six multiple wan solution for linux (206 comments)

Mpath-tools is a set of programs for linux 2.6+ that aim to facilitate load balancing and failover over multiple and heterogeneous ISP connections.

more than 3 years ago

Firefox 5 Scheduled For June 21 Release

six Re:High version numbers (266 comments)

4.0 was NT4 ... my guess is 95/OSR2/98 were all 3.2x

more than 3 years ago

Pioneer Anomaly Solved By 1970s Computer Graphics

six Re:To be fair... (169 comments)

The technique for Phong Shading was introduced in 1973 as an improvement to Gouraud Shading, but was too computationally intensive to be used for graphics back then. This is no longer the case.

It was too computationally intensive for *realtime* rendering in 1973, but clearly not out of reach for the kind of modeling software NASA people were using ...

Also, it should be noted that realtime phong shading was already common in demos/intros running on 33 MHz 386 CPUs back in the 90s

more than 3 years ago

Why You Shouldn't Worry About IPv6 Just Yet

six Re:No NAT, no glory (425 comments)

IPv4 multi-homing can't be done without BGP, either. The requirements for Provider Independent address space in IPv6 are identical to the requirements for PI address space in IPv4.

I meant "cheap" multi-homing without a PI address block, like it's used in many small/medium offices where you have multiple ISP links and just failover by changing the SNAT mapping at the gateway when one goes down.

Doing this with ipv6 requires renumbering the whole internal network each time you switch links, or the more costly alternative of getting your own PI block, which in turn isn't IMHO sustainable for the long term because everyone doing it would make the global BGP table grow an awful lot faster that it's already.

more than 4 years ago

Why You Shouldn't Worry About IPv6 Just Yet

six Re:No NAT, no glory (425 comments)

OK, so it seems you agree (with the Founders of the Internet) that end-to-end is a good thing. .... and now you say it's a bad thing. So is it a good thing or a bad thing then?

My personal opinion is that end-to-end is *generally* a good thing, but shouldn't be *enforced* because there always will be edge cases where it will conflict with privacy.

Er, what??

Do you mean to say that without NAT a firewall is not needed, or that a firewall doesn't impact reachability ?

more than 4 years ago

Why You Shouldn't Worry About IPv6 Just Yet

six Re:IPv6 gives me a choice (425 comments)

With IPv6 I can use NAT if I want.

I'm all for freedom of choice, my problem actually is that you can't use ipv6 NAT even if you want. Not with Linux anyway.

If people want anonymity within their local network, then there will be a market for devices that do IPv6 address cloaking and you can buy one and use it to hide your addresses.

Exactly, you would have to pay for something you can achieve with one iptables command line on ipv4. See my point ?

more than 4 years ago

Why You Shouldn't Worry About IPv6 Just Yet

six No NAT, no glory (425 comments)

The lack of SNAT/DNAT targets in Linux ip6tables makes it quite impossible to use ipv6 for any serious enterprise networking. Ipv6 multihoming can't be done without BGP, other solutions like mobile ipv6 or shim6 are - at best - a big mess, also who wants to broadcast his internal network topology/numbering scheme to the whole internet ?

There seems to be some kind of religious taboo here, where the only - supposedly - evil use of NAT (N-to-1 mapping) being taken into consideration, but this is IMHO just plain wrong. Also the NAT haters main argument is that it doesn't preserve end to end reachability (which is not even true for N-to-N mappings), but without NAT everyone is gonna use a stateful firewall for ipv6, and guess what ... the effect on reachability is almost exactly the same.

The other problem I have is with anonymity, without NAT every PC in your local network may be identified individually, there are many cases where this may not be desirable.

IMO ipv6 brings some nice new stuff to the table, the most obvious being the xxl address space, but takes away too much for me to consider using it for myself or my customers at the moment.

more than 4 years ago

Pixel Inventor Goes Back To the Drawing Board

six Re:Another World and Flashback: Prior Art? (304 comments)

Another world just stored vector graphics instead of bitmaps, takes less space, makes it much easier to animate too.

more than 4 years ago

Major ISPs Seek To Lower Broadband Definition

six Re:VoIP and broadband (426 comments)

So AT&T says that VoIP requires "faster speeds". Even using G.711 (i.e., uncompressed toll-quality), and including the overhead of the other layers, VoIP requires only ~120kbps. The thing about VoIP is not that it requires high speed, but that it requires low latency.

g.711 requires 64kbit/s in both directions, also high latency is not really a problem with VoIP (at least anything below 300ms), but the really important thing is low jitter.

more than 5 years ago

Voting Machine Attacks Proven To Be Practical

six Re:Why doesn't Public Key crypto figure in to this (225 comments)

If you presume a custom processor that will only execute code signed by an election commission, that would be a first step - the system won't run anything that hasn't been specifically approved for installation on the machine.

If you had RTFPDF, you would have noticed they actually used a clever technique called return based programming, to reuse small parts of trusted code and implement their hack using them.

more than 5 years ago

SHA-3 Second Round Candidates Released

six Re:MD6 (62 comments)

Nobody in their right mind is using both MD5 and SHA-1 together, and even if they do they are both standardized hash methods. Combining hash methods is dangerous at least and should not be done haphazardly. It would be much better to use SHA-2 256 instead, if only because it is a standardized hash and not some weird combination of two.

I think the author doesn't mean to combine SHA-1 and MD5 to make one hash, but instead using both hashes. This may be weaker for preimage attacks, but a lot stronger against collisions, so if it's what you're after it's one of the best ways to achieve it.

more than 5 years ago

Under my immediate control are X USB drives; X=

six Re:RAID0 (412 comments)

Alas, it was a terrible disappointment. hdparm -t showed 16.65 MB/s on a single drive, 20+ for two, 22+ for three and four drives, and 22.75 for all five.

You're obviously doing it wrong. Did you plug the 5 drives on the same hub / port ?

I have 4 SATA drives in USB2 enclosures (no RAID), and this is what I get :

  Timing cached reads: 3616 MB in 2.00 seconds = 1809.14 MB/sec
  Timing buffered disk reads: 96 MB in 3.01 seconds = 31.93 MB/sec

more than 4 years ago


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