Speedtester - upstream

I cannot get to the bottom of a problem with the upstream tests in te TBB speedtester.

My line operates at 59.xx down and 18.xx to 19 upstream but running te TBB speedtester gives a very slow rise - maybe 5 or 6 seconds before it records speeds of 17Mbps second or above.

A couple of tests:

http://www.thinkbroadband.com/speedtest/results.html...

http://www.thinkbroadband.com/speedtest/results.html...


Downstream is fine up to speed instantaneously, but look at the upstream. I have seen this on other users results too.


Any thoughts as to why.

In reply to a post by MHC:

Any thoughts as to why.

Do you use any adblockers or similar? I used to use one called Admuncher and that halved my upstream:

http://forum.admuncher.com/viewtopic.php?t=719

I assume the same problem could occur with anything that hooks into the network stack to monitor HTTP traffic.

And people are blissfully unaware on most speed testers due to algorithm controlling the needle and not showing the graph afterwards.

I have Ghostery installed in FF but the results are the same whether it is running or not. AV on/off does not matter. Using IE which has no blocking gives similar results.

Once the upstream gets to 18.xx it stays there so I know the line is fully capable - there is still spare SNR on the upstream with an achievable of around 24Mbps

How does http://labs.thinkbroadband.com/ispa fare?

Different - still the lag, and then a nice sawtooth with 19.1 Average and 23-24 Burst!

AV Off; Ghostery On
http://www.thinkbroadband.com/speedtest/results.html...

AV Off; Ghostery Off
http://www.thinkbroadband.com/speedtest/results.html...
http://www.thinkbroadband.com/speedtest/results.html...


If I do a large upload to somewhere like Photobucket and monitor in Task Manager, I will see it sit at 18-19Mbps for minutes - little ups and down from congestion &c but basically a continuous rate.

Andrew,

I too have been getting some weird results on the standard upstream tester with it consistently showing lower speeds than i'm obtaining (usually by about 4meg)
The downstream is pretty accurate and comparable to other tests I've run.

I just ran your new tests above and got the following:

New test

Old Test

Ookla

But it's close enough for government work
Just thought I post my 2p worth for you.

Chris

Similar to mine - lag in the upstream starting on the standard test and the saw tooth on the ISPA test.

Have tried the test in IE8.

It takes about 1 second to run, no data downloaded - stays on the start screen and in the info bar at the bottom of IE8 it says: "Done, but with errors on page."

Sawtooth is fairly normal.

Different browsers can affect that, I could smooth it out, but then you'd not see what was happening

Will have to find a machine with IE8 on it

Will most likely be a browser not supported message.

To that extent? It does not appear on the normal Speedtest - are you smoothing that out?


However, that is not the issue - it is the slow ramp up to 18 that I cannot resolve.

At one time - when the tester was first launched in the new format, upstream went straight up, then overnight it changed. Nothing changed here that I know of.

In reply to a post by MHC:

I have Ghostery installed in FF but the results are the same whether it is running or not. AV on/off does not matter. Using IE which has no blocking gives similar results.

Is that 'off' or 'not running'? I found with AM I had to actually unload it. Simply disabling adblocking didn't work.

In reply to a post by Andrue:

In reply to a post by MHC:

I have Ghostery installed in FF but the results are the same whether it is running or not. AV on/off does not matter. Using IE which has no blocking gives similar results.

Is that 'off' or 'not running'? I found with AM I had to actually unload it. Simply disabling adblocking didn't work.

First tried with it "paused" from its own menu, then Disabled in Options and restart FF, and finally "Removed" and FF restart. Same results.

1 min ago

near instant straight to 18meg for me

In reply to a post by Ianph:

1 min ago
near instant straight to 18meg for me

I wish I had that upload speed.

http://www.thinkbroadband.com/speedtest/results.html...

Are you an an 80/20 service? If you are it looks as though you have got the "stuck at 10" problem. I suffered from this for a short while and it took several long technician visits with 3rd line support involvment to sort it out.

My results before:
http://www.thinkbroadband.com/speedtest/results/id/1... 58.9/9.5
http://www.thinkbroadband.com/speedtest/results.html... 53.7/9.5

and immediately after the last visit:
http://www.thinkbroadband.com/speedtest/results.html... 44.4 /16.9
http://www.thinkbroadband.com/speedtest/results.html... 50.4/17.0

and a few days later after changing the modem and tidying up some wiring - there had been numerous disconnects, reboots, wiring extension, pair changes ...
http://www.thinkbroadband.com/speedtest/results.html... 58.2/18.4

Any further thoughts on the reason for the very slow rise?

Not yet

BT Traffic shaping?

In reply to a post by BatBoy:

BT Traffic shaping?

I doubt it. There are others I have seen with similar results and they are not on BT. Also, I can initiate a very large upload - say 400-800MB and it will run at 18Mbps quite happily.

I haven't seen the effect on anything other than BT Retail. The actual speed isn't the problem, it's the slow ramp up at the start which your earlier speedtests don't have.

I did a tbb test a few minutes ago.

Another example:

http://www.thinkbroadband.com/speedtest/results.html...

Ooo, interesting.

In reply to a post by MHC:

Are you an an 80/20 service? If you are it looks as though you have got the "stuck at 10" problem. I suffered from this for a short while and it took several long technician visits with 3rd line support involvment to sort it out.

Yuck. Yes, that looks familiar. I am on an 80/20 possible service, and just assumed it was the quality of my line limiting me. I'm on BT Infinity 2 and should just be out of minimum term contract today. Wondering about which ISP to migrate to. Maybe AAISP to fix the fault. (I'd love to, but their prices for 80GB a month usage are too high for me).

Not sure if any of this helps?

Max:	Upstream rate = 9780 Kbps, Downstream rate = 59080 Kbps
Bearer:	0, Upstream rate = 9739 Kbps, Downstream rate = 53695 Kbps

Link Power State:	L0
Mode:			VDSL2 Annex B
VDSL2 Profile:		Profile 17a
TPS-TC:			PTM Mode(0x0)
Trellis:		U:ON /D:ON
Line Status:		No Defect
Training Status:	Showtime
		Down		Up
SNR (dB):	 5.4		 6.4
Attn(dB):	 21.1		 0.0
Pwr(dBm):	 12.8		 6.6
			VDSL2 framing
			Bearer 0
MSGc:		18		26
B:		51		237
M:		1		1
T:		64		38
R:		12		16
S:		0.0308		0.7762
L:		16616		2618
D:		1051		1
I:		64		127
N:		64		254

I presume you are on a Residential service ... so talking to Tech Support will be a battle!

The stats suggest that you only have a 6dB noise margin and that is what is holding it down as with your downstream. It just looks a little suspicious - does it ever vary?

Your downstream is similar to mine - achievable 59, so I would have expected to see something above 15 for upstrream, unless there is a massive band of noise right on the U1 or U2 band of tones.

Can you get a plot showing each Tone with the bit loading, attenuation and SNR? That would be useful.

and there are others around.

In reply to a post by MHC:

I presume you are on a Residential service ... so talking to Tech Support will be a battle!

Exactly my concern. :-/

The stats suggest that you only have a 6dB noise margin and that is what is holding it down as with your downstream. It just looks a little suspicious - does it ever vary?

Not that I've seen. I have DSLstats running and recording a graph every so often.

Your downstream is similar to mine - achievable 59, so I would have expected to see something above 15 for upstrream, unless there is a massive band of noise right on the U1 or U2 band of tones.

Can you get a plot showing each Tone with the bit loading, attenuation and SNR? That would be useful.

Ok, here are some links:

Here is the BT estimator output:
http://i612.photobucket.com/albums/tt201/MisterReder...

Here are some VERY OLD stats from Sept 2012:
http://i612.photobucket.com/albums/tt201/MisterReder...

Here are some recent stats.

From yesterday:
http://i612.photobucket.com/albums/tt201/MisterReder...

From today - SNR per tone:
http://i612.photobucket.com/albums/tt201/MisterReder...

QLN:
http://i612.photobucket.com/albums/tt201/MisterReder...

HLOG:
http://i612.photobucket.com/albums/tt201/MisterReder...

Bitloading:
http://i612.photobucket.com/albums/tt201/MisterReder...

I might have to use the other script as sharing the output from dslstats is a pain.

U1 does seem a little low and the drop down to U2 is quite drastic. I noticed the earlier stats suggested 12Mb could be achieved.

It may be worth a call just to see.

In reply to a post by MHC:

U1 does seem a little low and the drop down to U2 is quite drastic. I noticed the earlier stats suggested 12Mb could be achieved.
It may be worth a call just to see.

Thanks for checking.