Cable Forum
Page 2 of 4 1 2 34
Show 100 post(s) from this thread on one page

Cable Forum (https://www.cableforum.uk/board/index.php)
-   Virgin Media Internet Service (https://www.cableforum.uk/board/forumdisplay.php?f=12)
-   -   10mb bb more like 6mb! (https://www.cableforum.uk/board/showthread.php?t=47215)

__spc__ 13-05-2006 14:11
Re: 10mb bb more like 6mb!
 
Cracked it - I used DrTCP to change my MTU and RWIN; I now get:

Sat, 13 May 2006 12:09:44 UTC

1st 512K took 441 ms = 1161 KB/sec, approx 9567 Kbps, 9.34 Mbps
2nd 512K took 431 ms = 1187.9 KB/sec, approx 9788 Kbps, 9.56 Mbps
3rd 512K took 430 ms = 1190.7 KB/sec, approx 9811 Kbps, 9.58 Mbps
4th 512K took 431 ms = 1187.9 KB/sec, approx 9788 Kbps, 9.56 Mbps

Overall Average Speed = approx 9739 Kbps, 9.51 Mbps

Thanks very much!

mmm 13-05-2006 16:46
Re: 10mb bb more like 6mb!
 
I'm glad you are sorted, pity I can't fix my own:-

Code:
Sat, 13 May 2006 14:44:49 GMT

1st 512K took 515 ms = 994.2 KB/sec, approx 8192 Kbps, 8 Mbps
2nd 512K took 500 ms = 1024 KB/sec, approx 8438 Kbps, 8.24 Mbps
3rd 512K took 500 ms = 1024 KB/sec, approx 8438 Kbps, 8.24 Mbps
4th 512K took 719 ms = 712.1 KB/sec, approx 5868 Kbps, 5.73 Mbps

Overall Average Speed = approx 7734 Kbps, 7.55 Mbps
But I'm sure that's due to my old Terayon cable modem and its 10Mb Half duplex WAN port!

Druchii 13-05-2006 22:58
Re: 10mb bb more like 6mb!
 
Quote:
Originally Posted by __spc__
Cracked it - I used DrTCP to change my MTU and RWIN; I now get: Sat, 13 May 2006 12:09:44 UTC 1st 512K took 441 ms = 1161 KB/sec, approx 9567 Kbps, 9.34 Mbps 2nd 512K took 431 ms = 1187.9 KB/sec, approx 9788 Kbps, 9.56 Mbps 3rd 512K took 430 ms = 1190.7 KB/sec, approx 9811 Kbps, 9.58 Mbps 4th 512K took 431 ms = 1187.9 KB/sec, approx 9788 Kbps, 9.56 Mbps Overall Average Speed = approx 9739 Kbps, 9.51 Mbps Thanks very much!
Lovely.

And mmm thats amazing speeds from the Tarayon. But shouldn't a Base10 only be capable of less than that?

James Henry 13-05-2006 23:00
Re: 10mb bb more like 6mb!
 
Quote:
Originally Posted by Druchii
Lovely.

And mmm thats amazing speeds from the Tarayon. But shouldn't a Base10 only be capable of less than that?
Speed of 10Mbit half duplex connection depends a lot on how the machine is set up on the TCP settings, etc.

7.5Mbit isn't unrealistic.

Druchii 13-05-2006 23:02
Re: 10mb bb more like 6mb!
 
Quote:
Originally Posted by James Henry
Speed of 10Mbit half duplex connection depends a lot on how the machine is set up on the TCP settings, etc. 7.5Mbit isn't unrealistic.
Ah, of course, thanks for clearing it up :)

mmm 14-05-2006 10:30
Re: 10mb bb more like 6mb!
 
Quote:
Originally Posted by James Henry
Speed of 10Mbit half duplex connection depends a lot on how the machine is set up on the TCP settings, etc.

7.5Mbit isn't unrealistic.
The speed test is a bit optimistic I think (but repeatable!), because each download packet size is only half a second. Sustained speed on big downloads is about 6Mbps, but I'm happy with this as it means the rate limiting point in any real use is generally the source not the modem.

Rik 14-05-2006 10:41
Re: 10mb bb more like 6mb!
 
I would like to add that all these folks relying on HTTP speed tests, they arent very accurate.

To see that all you have to do is change your proxy settings, through my normal proxy (no proxy settings) i was getting around 6Meg, changed to a Hersham Proxy and the difference was much more noticeable.

A good speed test and very accurate is to use NNTP (Usenet) I connect via Giganews Europe Server and my connection is MAXXED out on 10Meg :)

1208k/Bs :)

Chrysalis 14-05-2006 21:05
Re: 10mb bb more like 6mb!
 
Quote:
Originally Posted by __spc__
Cracked it - I used DrTCP to change my MTU and RWIN; I now get:

Sat, 13 May 2006 12:09:44 UTC

1st 512K took 441 ms = 1161 KB/sec, approx 9567 Kbps, 9.34 Mbps
2nd 512K took 431 ms = 1187.9 KB/sec, approx 9788 Kbps, 9.56 Mbps
3rd 512K took 430 ms = 1190.7 KB/sec, approx 9811 Kbps, 9.58 Mbps
4th 512K took 431 ms = 1187.9 KB/sec, approx 9788 Kbps, 9.56 Mbps

Overall Average Speed = approx 9739 Kbps, 9.51 Mbps

Thanks very much!
out of curiousity what did you change them to?

mmm 15-05-2006 00:53
Re: 10mb bb more like 6mb!
 
MTU should be 1500 on NTL cable (My VPN software reduces this to 1300 by default)

RWIN (receive Window) probably most significant, mine is currently at 256960 using TCP 13323 windows scaling (=64240*4=1460*44*4). XP PRO auto adjusts this parameter but I don't think it uses the scaling so it doesn't get above 65535.

__spc__ 15-05-2006 07:28
Re: 10mb bb more like 6mb!
 
Running the tweaks test here: http://www.dslreports.com/tweaks

I set the MTU to 1500 and the RWIN to the maximum recommended by the test analysis.

OLDo 15-05-2006 12:28
Re: 10mb bb more like 6mb!
 
If NTL are actually providing an "up to" 10Mbit service - they should advertise it as such. As per http://www.home.ntl.com/page/broadband3 it's "10Mbit broadband", not "upto" or "near to".

As far as i'm aware, it is mainly ADSL connections that provide "up to" services. This is due, in part, to the nature of the *dsl technology, in that it deteriorates heavily over long cable distances. ISPs are therefore required to state that they are "up to" connections, because each individial line will sync at a speed dependant on their distance from the exchange.

Cable is different. Due to the way it is brought into the users home - everyone should be able to connect at 10mbit speeds, assuming they have the correct hardware.

__spc__ 15-05-2006 12:33
Re: 10mb bb more like 6mb!
 
CS made it clear to me that it was upto 10Mb, guaranteed 2MB until 1 June, then guaranteed 4Mb thereafter...

OLDo 15-05-2006 12:38
Re: 10mb bb more like 6mb!
 
strange.. i hate the way ISPs can mince their words so easily and get away with it. :td:

Chrysalis 16-05-2006 01:35
Re: 10mb bb more like 6mb!
 
some more fiddling done here, if I turn of mtu discovery transfers speed up almost instantly instead of a triangle on graph and slow increase but I know this will cause me problems on anything that wont work with mtu 1500.

My rwin is currently on 128280 which helps a lot outside of peak hours but is detrimental in peak hours, I find in peak hours lower rwin is better because the retransmits are less damaging to speed and outside peak hours when there is no retransmits the larger window is effective.

moon_t 18-05-2006 14:54
Re: 10mb bb more like 6mb!
 
To add fuel to the fire, I have an NTL home 100 modem from the days of 512k, I have been very loyal :) and have never been able to get above 5.1 meg on any speed tests or sustained downloads in Windows or Linux (Leicester Area). I spoke to the notorious Indian call centre believing my modem was the problem, they advised me all kinds of crap that I knew wouldn't work (delete your cache to increase your speed etc etc... plus they had no idea about my Linux box settings).

Anyway I digress, the upshot is they couldn't sort my speed (or lack of) so I downgraded to 2mb, knowing that the 4mb upgrade is just around the corner, and strangley enough I get a full 2mb service every time. Why pay for a service they can't provide to me?

Roll on ADSL2 when I'll do what I haven't for the past 6 years and desert ntl entirely, taking my phone, internet and TV with me.


All times are GMT +1. The time now is 02:57.
Page 2 of 4 1 2 34
Show 100 post(s) from this thread on one page

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2026, vBulletin Solutions Inc.
All Posts and Content are © Cable Forum