The thing most people don't understand about TCP is that it accelerates linearly and falls back exponentially.
That is the AIMD behaviour of some variants of TCP (reno for example) and only when they have past slow start and are in steady state. This page has some graphs which show the difference in the cwnd behaviour for different TCP variations, it also links to the relevant papers. There is currently a mix of TCP variations in use and not all use AIMD. Linux, for example, uses CUBIC and in the past has used BIC and NewReno as the default TCP variation.
Seems obvious, but let's consider the implications.... Your router cannot do anything of meaning about incoming data. By the time your router sees it, it's already traversed your cable or DSL line and the damage has been done.
For TCP connections your router could control the window size of the connection by rewriting outgoing packets. If you put a cap on the window size it would keep your throughput low. Your router would need to keep some state on TCP connections, you could probably get away with just the number of active TCP connections. Of course this wouldn't help with anything UDP based.
Hmm wait for night stick a bright light on it and fly it over field and wait for the reports of lights in the sky moving in a way that couldn't possibly be man made to flood in.
I always liked the flying lawnmower
http://www.youtube.com/watch?v=zT60SkXN1UY
African grey parrots are kept as pets. These are said to be as intelligent as a two-year old. Some of them can understand sentances from a vocabulary of hundreds of words. They don't progress much beyond a two year old. And they are Not Like Us, so it's OK to keep them in cages. Apparently. Hmmm.
Most people keep small children in cages, they just normally refer to them as cribs, cots or playpens. Oh and don't get started on swaddling, okay that is only up to sbout 5 months.
While the university was originally a Poly, some 20 years back
It was origianlly a college (open in 1930) and change to being a poly in 1969. It changed to a university in '92 along with all the other polys, so some 13 years back.
graduate IT industry in the UK is ridiculously competitive
You could become a warden. In the UK (in the unis I've been to at least) some staff members are given free accommodation in exchange for dealing with the students grips about the halls of residence. Can be quite annoying what with the fire alarms going off at all hours.
Professors think they are gods because of the PhD.
I disagree with this. I think it is more to do with the empire building and the endless grant proposals that they have to do. Being told that is a good idea have a million pounds to investigate it has got to do something for your ego.
I thought, years ago when I was looking at it, that IPv6 had a TTL that was modifiable, and thus wouldn't time out.
TTL (Time To Live) actually has nothing to do with time. It is a number which is decremented in the packet header each time the packet passes through a router. When the TTL field reaches (IIRC) 0 the packet is dropped. You can set the TTL in IPv4 if you want to, normally it is done when dealing with multicast traffic so that the packets don't travel too far out of the network multicast routing protocols also have an impact on this).
If you can make a computer with no internet access send email to anybody - i salute you as the biggest geek on the planet
He didn't say that it didn't have network access just that there is no Internet access. It is quite possible to send email on a local network which is detached from the Internet at large. After saying that we don't actually know if they do have a local network.
Yeah that damn soap is just so slipperly they really should do something about it to stop the inmates looking like fools when they can't hold onto the soap:-)
I was once talk to a friend of mine, taking the mick out of him for being a theoretical computer scientist, and he uttered a classic line "I'm not a theoretician and I can prove it." Still make me smile to this day.
I recently finnished reviewing a few patents because of a grant application I've made, they were mainly to do with commercial detection routines some of which have expired so the free PVR guys might want to have a look at those:-). They are the most boring and badly written crap that I've ever seen. The entire purpose is to make sure that you can't understand what the hell is going on in them. The patent lawyers make sure they are as broad as possible just to see if they can get away with it, I ask my patent lawyer about that and she confirmed it. They are annoying and sometimes very sparse on the technical details so you just have to guess what is meant. I don't think that reviewing patents is a job that I could do for very long while staying sane.
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The thing most people don't understand about TCP is that it accelerates linearly and falls back exponentially.
That is the AIMD behaviour of some variants of TCP (reno for example) and only when they have past slow start and are in steady state. This page has some graphs which show the difference in the cwnd behaviour for different TCP variations, it also links to the relevant papers. There is currently a mix of TCP variations in use and not all use AIMD. Linux, for example, uses CUBIC and in the past has used BIC and NewReno as the default TCP variation.
Your router can only control what it sees.
Seems obvious, but let's consider the implications.... Your router cannot do anything of meaning about incoming data. By the time your router sees it, it's already traversed your cable or DSL line and the damage has been done.
For TCP connections your router could control the window size of the connection by rewriting outgoing packets. If you put a cap on the window size it would keep your throughput low. Your router would need to keep some state on TCP connections, you could probably get away with just the number of active TCP connections. Of course this wouldn't help with anything UDP based.
In that case all we need to do is add a layer of redirection in order to speed up all the other ones ;-)
Hmm wait for night stick a bright light on it and fly it over field and wait for the reports of lights in the sky moving in a way that couldn't possibly be man made to flood in. I always liked the flying lawnmower http://www.youtube.com/watch?v=zT60SkXN1UY
Wasn't it Professor Stephen Falken?
Most people keep small children in cages, they just normally refer to them as cribs, cots or playpens. Oh and don't get started on swaddling, okay that is only up to sbout 5 months.
Some still do. The amount of people wearing them depends on the time of year. They still wear them for some meals and I think sometimes for exams.
It was origianlly a college (open in 1930) and change to being a poly in 1969. It changed to a university in '92 along with all the other polys, so some 13 years back.
graduate IT industry in the UK is ridiculously competitive
It shouldn't be if you have a 1st.
Good luck in the applications.
I think the reason would be the taste, it was awful.
You could become a warden. In the UK (in the unis I've been to at least) some staff members are given free accommodation in exchange for dealing with the students grips about the halls of residence. Can be quite annoying what with the fire alarms going off at all hours.
I disagree with this. I think it is more to do with the empire building and the endless grant proposals that they have to do. Being told that is a good idea have a million pounds to investigate it has got to do something for your ego.
That explains it. It isn't people that are copying movies it is dogs. It is all a plan to get rid of the cats. It all makes sense now.
TTL (Time To Live) actually has nothing to do with time. It is a number which is decremented in the packet header each time the packet passes through a router. When the TTL field reaches (IIRC) 0 the packet is dropped. You can set the TTL in IPv4 if you want to, normally it is done when dealing with multicast traffic so that the packets don't travel too far out of the network multicast routing protocols also have an impact on this).
He didn't say that it didn't have network access just that there is no Internet access. It is quite possible to send email on a local network which is detached from the Internet at large. After saying that we don't actually know if they do have a local network.
Did you read the instructions on the bottle. It did say not to be taken orally. :-)
To me that sounds like a terrible climate.
Gets really cold
No it doesn't. It drops below freezing every so often and you might get a lot of snow every decade.
Always messy, raining, etc.
There are regions that are known for the rain, North west England for example whereas East Scotland is known for not raining.
Ahh there is always a down side :-)
Or thier detector doesn't work when the TV is off so they physically check.
Yeah that damn soap is just so slipperly they really should do something about it to stop the inmates looking like fools when they can't hold onto the soap :-)
I was once talk to a friend of mine, taking the mick out of him for being a theoretical computer scientist, and he uttered a classic line "I'm not a theoretician and I can prove it." Still make me smile to this day.
Does that mean you are the only person of slashdot that have actually read the article :-)
I recently finnished reviewing a few patents because of a grant application I've made, they were mainly to do with commercial detection routines some of which have expired so the free PVR guys might want to have a look at those :-). They are the most boring and badly written crap that I've ever seen. The entire purpose is to make sure that you can't understand what the hell is going on in them. The patent lawyers make sure they are as broad as possible just to see if they can get away with it, I ask my patent lawyer about that and she confirmed it. They are annoying and sometimes very sparse on the technical details so you just have to guess what is meant. I don't think that reviewing patents is a job that I could do for very long while staying sane.
From the wording they could be the same speed.
Nope at around £70 it is still more than twice the price on the one I bought.