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Reply # 44770 27-Aug-2006 10:24
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3780 on my 4mbps Connection

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  Reply # 46133 14-Sep-2006 13:18
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Battleneter: My first post in this forum "Sniff"

I generally get near exactly 2MB upload speeds both in real world usage and www.NZDSL.co.nz on my 10/2MB plan, (and about 9MB real world download, however NZDSL doesnt do well measuring over 4MB down or up).

Last month on the same day as a network upgrade here in CHCH, my upload speed jumped to about 8MB(always over 4MB) on NZDSL every time and i have a picky. So I tested with a Torrent off a crap leech public site and got it to nearly 700KB/s. Unfortunately after the roll over period a few days ago my upload speed is back to nearly exactly 2MB. Does however prove to me they are capable of upping the "up" speed far higher than the current plans.


BTW I have notice sites like http://www.speakeasy.net/speedtest/ do a piss poor job of benchmarking our international cable speeds if that is what a few of you are using to test international speeds.






I had that same thing occur with speed,  where I was getting effectively 10/10, (realworld more like 8 to 10mbps down and 6-8 up.

then they had all those outages, and they got my ip changed, and now its very definitely capped.

(i went from a .17 position = sharing with prettymuch noone, to a .243 meaning its next to overloaded.)




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  Reply # 46580 21-Sep-2006 13:26
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I wish I knew what was wrong with my setup then. I have only tried two upload applications 1) upload to a web site using (smart)ftp and 2) acting as a ftp server for a user in the US

On my 4Mbs/2Mbs connection

in 1) the best speed I have got is about 40Kbs upload and in 2) the best speed the downloader has got is about the same. But interstingly when he starts up a second ftp session, that also gets 40Kbs so in fact my upload speed (and his download speed) is effectively 80Kbs.

Must be something strange with the way ftp is setup on my network. I basically run a router/switch connected to the TCL modem and have the router configured to forward port 21 to my desktop. Maybe I need to also forward the port used for data to the desktop?

When I run the usual speed tests, the speeds are consistent with a 2Mbs upload speed.




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  Reply # 46591 21-Sep-2006 18:04
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Thats soft of behaviour could be caused by layer 7 packet shaping or TCP receive window issues amongst other things. Try adjust the TCP receive window upwards at both ends and see if that helps.

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  Reply # 46599 21-Sep-2006 19:54

Fraktul: Thats soft of behaviour could be caused by layer 7 packet shaping or TCP receive window issues amongst other things. Try adjust the TCP receive window upwards at both ends and see if that helps.


Fraktul: Can you actually do that in Windows? I thought TCP window sizes were dynamic (RFC1323) and wouldn't the receive window only be too small if there was packet loss?

My tests suggest TCL impose an 80KiloByte/s upload speed limit (per connection)! But which layer it's filtered/shaped at I don't know.

My test situation was one TCL 10mbit/s cable connection in Christchurch to my 3.5mbit/s Xtra ADSL (also in chch). Using SFTP (ie SSH TCP port 22) to transfer ~50MB from the TCL to my ADSL. Speed monitoring was done on the ADSL connection with gkrellm and PF logs from a FreeBSD firewall. The TCL connection monitored the speed with the FileZilla FTP client. The TCL connection used a basic Linksys ethernet-ethernet router.

The speed and speed delta (~0 change in speed) were reminicient of upstream traffic shaping.

Are TCL not delivering on their advertised speeds? Can more ppl post their tests?
(edited post: removed question about cable being asynchronous)




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  Reply # 46601 21-Sep-2006 20:51
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They are dynamic yes but there are initial values and a algorithm behind how the silding window works. This should be tweaked to be optimistic instead of pessimistic in this case I am suggesting. I think there is a freeware app which does this, dr tcp or something.

Optimistic would be larger, not smaller, you are requesting more packets before an ack is required.

I very much doubt its asynchronous, for a start there are quite different frequencys for both up and downstream :) . Given what I have seen of peoples modem outputs in the forums however it is asymmetric in its theoretical throughput however. My knowledge of Cable modem its restricted to, its TDMA, uses QAM 64/256 for downstream and 32/64/128 for up and not much more ;)


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