How does Go Large work?

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portege

188 posts

Master Geek

#10772 10-Dec-2006 22:17

Hi there, I know I have 2 questions, this may have already been covered but I am just confused on how my broadband plan works. Currently broadband for me is running very slow, I can not watch trailers from Apple.com; or youtube.com. I used to be able to watch them very easily without delay.

Although it shows I have downloaded 1gb today just by occasionally watching trailers ??? I can longer do so.

My line speed tests shows that I have a 123.XXX.XXX IP - is this the new Xtra Go Large IP?

Second: In saying that 2 days ago I was downloading an ISO via Direct Connect and it clocked 1Mbit/sec (yes..... I downloaded a 750MB ISO within minutes) - How is that possible when all of my speedtests have been clocking 3mbit/sec?

freitasm

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#55167 10-Dec-2006 22:34

You probably download the ISO at 1 MBps (megabyte/second) not, 1Mbps (megabit/second). Quite possible, if the server is located withing New Zealand, or with a local mirror.

As for speed tests, those are inacurate and should be only a reference. Those measure speeds in megabits per second.

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#55181 11-Dec-2006 08:17

I'm on Go Large too, and my IP is 125.236.XXX.XXX. Sometimes it can be 125.238.XXX.XXX, although I've heard people getting IPs in the 222.XXX.XXX.XXX or 125.237.XXX.XXX range, which they claim give faster speeds. Personally, I've never got anything other than 125.236/238.XXX.XXX. I can't stream videos/audios either, nor does my surfing go very fast. Downloads from HTTP etc. have been rather fast in the past week or so (~600kB/sec.) but have since dropped to 180kB/sec and appears to be capped there. By the way, this is international traffic I'm talking about.

p.s. Could someone from Telecom allocate enough bandwidth so I can at least stream Bloomberg from R2.co.nz (that's NZ traffic, and yet I can't stream it!!!

).

Edit: By HTTP downloads, I mean opening 8 simultaneous downloads with 5 connections each, it's not possible to open 5 simultaneous connections when surfing.

juha

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#55195 11-Dec-2006 11:39

1Mbyte/s or 8Mbit/s plus ATM and protocol overhead isn't yet possible on Telecom's first-generation DSL, and impossible to reach thanks the 128kbit/s upstream Go Large service :)

Juha

portege

188 posts

Master Geek

#55196 11-Dec-2006 11:42

Yes! That's what I thought too (7.2 after overheads). I tested the ISO and it fully works. I managed to download a 750-800MB ISO under one hour.

How is that possible? (I used DC++ and was downloading from a NEW ZEALAND user I believe)

At that time I dont believe I was on Go Large - I was on Explorer

juha

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#55198 11-Dec-2006 11:49

Let's say 750Mbyte in 3600 seconds (one hour)... that's 208kbyte/s, or 1.65Mbit/s approx. Sounds about right for Go Large, but please check my maths (it is Monday after all).

From what I've heard, engineers have in lab tests manage to push 3-4Mbit/s downloads on 128kbit/s upstream-restricted links, but that's it. TCP is a two-way protocol and you need to send ACKnowledgement packets etc in order for the downstream to work.

Juha

portege

188 posts

Master Geek

#55199 11-Dec-2006 11:53

It is rather interesting however now I've switched to Go Large, I can not even stream video from Youtube or Apple Trailers (used to be able to without lag)... HTTP downloads are only around 12-20kbps.... (The ISO download was on Explorer)... oh well... my fault for switching.

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#55216 11-Dec-2006 15:03

As i understand from what Xtra business have told me, they have separated their bandwidth into
2 pools, one for Go Large, and one for the Rest, you can tell which pool your currently in by
what IP address you have, ie the 123.XXX.XXX

The Go Large pool had additional traffic management to the standard pool.

juha

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#55226 11-Dec-2006 15:59

Go Large has its own connectivity into Telecom's core network - and it's pretty limited at the moment, until their next upgrade cycle.

Juha

superunleaded

2 posts

Wannabe Geek

#55251 11-Dec-2006 20:21

portege: Yes! That's what I thought too (7.2 after overheads). I tested the ISO and it fully works. I managed to download a 750-800MB ISO under one hour.

How is that possible? (I used DC++ and was downloading from a NEW ZEALAND user I believe)

At that time I dont believe I was on Go Large - I was on Explorer

ISOs are often full of garbage bytes (blank parts that contain no useful data, probably just filled with zeros).
DC++ has supported zlib compression of transfers for a long time now, this will explain your transfer rate.
Mount the ISO and note the total size of all the files on it, it will be significantly less than the size of the ISO file.

Fraktul

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#55253 11-Dec-2006 20:45

It would be interesting to see somebody write a java app to show the effect of packetloss, latency and up/down stream dimensions on tcp transfers.

Downloading using tftp which uses udp for transport will not result in any problems for the 128kbps limited upstream path. I am surprised more p2p programs do not use udp precisely for this point however i assume they found the trade off was more inefficient for hash transfers etc