Beta

Slashdot: News for Nerds

×

Welcome to the Slashdot Beta site -- learn more here. Use the link in the footer or click here to return to the Classic version of Slashdot.

Thank you!

Before you choose to head back to the Classic look of the site, we'd appreciate it if you share your thoughts on the Beta; your feedback is what drives our ongoing development.

Beta is different and we value you taking the time to try it out. Please take a look at the changes we've made in Beta and  learn more about it. Thanks for reading, and for making the site better!

Comments

top

Verizon Boosts FiOS Uploads To Match Downloads

petermgreen Re:As it should be (228 comments)

There are legitimate reasons for asymetry on DSL and cable

On DSL upstream and downstream have to be given seperate frequency slices out of the limited bandwidth available on a typical phone pair (which lets not forget was only designed to carry voiceband). So you have to tradeoff upstream speed and downstream speed and for most users it makes more sense to tradeoff towards downstream. Having said that I do think it's scandalous that symetric services are insanely expensive compared to asymetric ones of comparable total bandwidth.

On cable the technical reasons are even greater, cable networks are designed for broadcasting TV with a high power transmitter broadcasting through the high-loss (due to the splitting/padding) network to a lot of receivers. Upstream traffic is going against the flow which means it has a lower acceptable transmit power and a lot more interference present at the receiver.

On the other hand with fiber the only reason for the asymetry is artifical crippling (making it harder to use P2P, run servers etc)

yesterday
top

Verizon Boosts FiOS Uploads To Match Downloads

petermgreen Re:aaargh! pinheads in the IT. (228 comments)

Split-tunnel pretty much kills the whole point of using a VPN.

Depends on what you see as "the whole point of using a VPN".

Afaict there are three main reasons to use a VPN

1: you don't trust the provider of your internet connection
2: you need to access IP-locked resources on the internet
3: you need to access resources on a private network that is not directly reachable from the internet.

"Split tunnel" kills reason 1 and probablly also reason 2 (unless there is some complex routing configuration in place). It certainly does not kill reason 3 which is often the main reason for using a VPN.

On the other hand forcing everything down the VPN kills the ability to use resources on your local network (a PITA if you use a network printer) and means traffic to the internet is wastefully forced to take a roundabout route to it's destination.

yesterday
top

Verizon Boosts FiOS Uploads To Match Downloads

petermgreen Re:What about (228 comments)

From what I can gather both comcast and verizon bullied netflix into paid peering by refusing to expand peering with any carrier netflix used or tried to use as an upstream.

When netfllix paid up to comcast they got massive improvments in connectivity to comcast customers, when they paid up to verizon they didn't.

http://hardforum.com/showthrea...

yesterday
top

The Almost Forgotten Story of the Amiga 2000

petermgreen Re:In other words (181 comments)

I don't know about the amiga specifically but some computers have a memory backup battery mounted on the main PCB. If they leak and the leakage is not noticed and dealt with quickly it can cause severe damage to PCB traces which can be a nightmare to repair.

2 days ago
top

The Almost Forgotten Story of the Amiga 2000

petermgreen Re:SCSI madness (181 comments)

Until you have to deal with an old machine that has one of the buggy SATA1 controllers that falls over if you plug in a SATA2 drive.

Some drives had a jumper to force SATA1 mode but that has dissappeared on more modern drives.

2 days ago
top

Malaysian Passenger Plane Reportedly Shot Down Over Ukraine

petermgreen Re:"Issue on board" (751 comments)

AFAICT oil isn't such a big issue because it's routinely shipped around the world, so unless there is noone for russia to sell it's oil to oil sanctions between russia and europe won't change things much. Europe will pay slightly more, russia will get slightly less. Other countries and trasnportation companies will profit.

Gas is the big issue because it has traditionally been moved by pipeline. Moving it by ship requires special terminals to purify and liquify it and special ships to carry the cryogenic liquid. The US currently has a glut of gas but moving that gas to europe will mean the building of more LNG terminals and ships which takes time.

5 days ago
top

Sony Forgets To Pay For Domain, Hilarity Ensues

petermgreen Re:Black hole? (275 comments)

IIRC 10 years is the max on com/net/org

How it could happen is pretty simple, someone is working on a new service, they are in a hurry and just buy the domain with a company credit card or a small one time PO or whatever putting their individual work email address as the contact info. They register it for a few years, maybe even the maximum of 10. Maybe they set a reminder for themselves to renew it, maybe they don't bother as they think it unlikely the domain will stay in use that long.

The project grows in importance but noone notices that the domain behind it is associated with one employee, then that employee becomes an ex-employee and their email is shut down

about a week ago
top

Telcos Move Net Neutrality Fight To Congress

petermgreen Re:article summary didn't really summarize... (52 comments)

The problem is what the customers purchased is generally a connection to the internet with no particular gaurantees about performance. If you want connections with service level agreements coverting performance to defined locations (e.g. major peering connections) you can get them but expect to pay a hell of a lot more than you would pay for a regular "broadband" connection.

Since they never agreed to provide any particular ammount of bandwidth in the first place there is little to stop them taking away some of the bandwidth they currently give to "best effort IP" to reallocate it to premium services. Whether they do that statically by creating fixed bandwidth channels or dynamically through prioritisation doesn't really make a fundamental difference.

When the "best effort IP" service is the entire service it's in the provider's interest to make it not suck so they retain customers. OTOH when they offer both "best effort IP" and premium services it's in their interests to make the "best effort IP" service suck so they can sell more premium services (which may or may not be IP based).

about a week ago
top

Mozilla Doubles Down on JPEG Encoding with mozjpeg 2.0

petermgreen Re:What we really need (129 comments)

It exists, it's called JNG but support for it is poor :(

about a week ago
top

Mozilla Doubles Down on JPEG Encoding with mozjpeg 2.0

petermgreen Re:The future turned out to not be so cool (129 comments)

I think the largest PNG file that I've been aware of was under 500KB.

I'm sure i've seen bigger.

A 1080p frame in uncompressed RGB is about 6MB. Afaict PNG gets of the order of a 3x ratio on photographic data so we are probablly talking a couple of megs of png if someone lifts a frame from a 1080p video.

You should be able to download that in less than 1/6th of a second with 24mb.

Unfortunately the intenet architecture doesn't handle short connections well. The TCP/IP stack doesn't know what the available bandwidth is so it has to be conservative initially. On high bandwidth but also high latency connections (e.g. user in europe, server in the USA or vice-versa) it often doesn't reach the full speed available before the transfer is over.

I just took a screenshot of my dual-monitor desktop and it was about 125KB. And that's just saving it with MS-Paint

This is pretty meaningless without knowing what was on the desktop at the time.

about a week ago
top

Pseudonyms Now Allowed On Google+

petermgreen Re:The frick? (237 comments)

In the early days of google+ there were reports of people losing their entire google account (not just google+) for signing up to google+ under something other than their real name. I can see why people would be reluctant to take that risk (however slight) with their main google account (throwaway accounts are another matter).

about a week ago
top

Leaked Build of Windows 9 Shows Start Menu Return

petermgreen Re:What's the big deal about win8? (346 comments)

I guess a lot of people here have Win8 forced upon them by external circumstances, which tends to put everyone in a sour mood.

Yeah, you want/need a newer version of the core stuff and you get a new and supposedly improved GUI shoved down your throat.

It's hardly unique to windows, look at all the gnome2 users who got gnome3 shoved down their throat when they updated to to the new release of their linux distros.

about a week ago
top

New Raspberry Pi Model B+

petermgreen Re:You Can make a Rasberry Pirate Radio (202 comments)

Looks like the NUC has the same issue most high end arm boards do, only one ethernet port :( looks like it may be possible to add a minipcie card but only by butchering the case.

about a week ago
top

New Raspberry Pi Model B+

petermgreen Re:You Can make a Rasberry Pirate Radio (202 comments)

How small is small?

Once you go up to mini-itx there are loads of options but I sense that is rather bigger than you want to be.

The utilite standard and pro models (but not the value model) have dual ethernet but they are kinda pricy. Theres various hackable routers but they tend to be rather lacking in CPU power and storage (they make a Pi look postively high end by comparision)

The other option is to use an external USB ethernet adaptor.

about a week ago
top

Elite Group of Researchers Rule Scientific Publishing

petermgreen Re:Just an opinion... (123 comments)

I just did some googling and it seems here in the UK a full time gabage collector would make about £12K per year (though it's paid hourly and in practice it may be difficult to find full time work).

I'm just about to start a postdoc position on just under £30K per year.

about two weeks ago
top

Child Thought To Be Cured of HIV Relapses, Tests Positive Again

petermgreen Re:News? (126 comments)

They thought she had been cured because treatement had stopped and the virus had not returned as expected.

Turns out they were wrong, the virus just took longer to return than expected.

about two weeks ago
top

Today In Year-based Computer Errors: Draft Notices Sent To Men Born In the 1800s

petermgreen Re:What has a DMV got to do with draft notices? (205 comments)

AIUI (I don't live in the US so their may be errors in this)

To issue notices to register for the draft (there is no draft in the US at the moment but registration is still required in case there is one) you need two things, firstly a list of people with their addresses, secondly a list of people who have already registered for the draft. Then they can take the people who are in the first list and not in the second list and send them notices.

So the question becomes where to get that list, why the DMV well it's kinda simple.

1: most people drive and hence are issued driving licenses by their state's DMV
2: driving licenses are used as ID cards
3: you have a minority of people who don't drive, these people nevertheless need some kind of ID card, the states decided that it was simpler to have the DMV issue ID cards to people even if they don't drive than to set up a separate ID card department.

So the DMV database is the closest thing to a "database of all people in the state" that is readily available.

about two weeks ago
top

Today In Year-based Computer Errors: Draft Notices Sent To Men Born In the 1800s

petermgreen Re:Huh? This info was in a live database? (205 comments)

AIUI they used the DMV (driver registration) database to send out these reminders. Is it really that surprising that someone born in the 1890s could have been driving up to say the 1980s and have active records in the driving license database continuing into the 1990s and 2000s?

about two weeks ago
top

Today In Year-based Computer Errors: Draft Notices Sent To Men Born In the 1800s

petermgreen Re:What might have happened. (205 comments)

One scenario: some systems have tables that use a separate field for storing the century.

Why do you think they have that field? Why would someone design a database that is less efficient and encourages wrong queries?

Most likely because someone previously fucked up and thought 2-digit years would be enough, by the time they realised they needed to fix that it was easier to add a new field than change the semantics of an existing one. Given that how accurate do you expect the data in the centuary field to be for old records?

and in some databases they didn't even go as far as adding a century field instead just assuming that 2 digit years represented dates in a window arround the current date.

about two weeks ago
top

CentOS Linux Version 7 Released On x86_64

petermgreen Re:Fedora can be annoying.. (125 comments)

Do network drivers, serial drivers, input drivers, storage drivers, filesystem drivers and so-on belong in the kernel? microkernel advocates would say no, most designers of operating systems that actually get used have said yes.

I don't see how at least the low level part of a video driver is any different.

about two weeks ago

Submissions

petermgreen hasn't submitted any stories.

Journals

petermgreen has no journal entries.

Slashdot Account

Need an Account?

Forgot your password?

Don't worry, we never post anything without your permission.

Submission Text Formatting Tips

We support a small subset of HTML, namely these tags:

  • b
  • i
  • p
  • br
  • a
  • ol
  • ul
  • li
  • dl
  • dt
  • dd
  • em
  • strong
  • tt
  • blockquote
  • div
  • quote
  • ecode

"ecode" can be used for code snippets, for example:

<ecode>    while(1) { do_something(); } </ecode>
Create a Slashdot Account

Loading...