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Slow Connection Speeds

mitchell20
Grafter
Posts: 424
Registered: 30-07-2007

Slow Connection Speeds

Since having my 1Mb ADSL activated on Monday I have yet to getting anything faster than 820Kbps. My exchange is a new ADSL enabled exchange.

Changed MTU and receive window more times than I care to remember with no effect at all...lowering my MTU from 1478 reduces my speed to below 800.

Currently set at 31636 and 1478 (router as well)

Connected via a Netgear DG834G - tried plugging it into master BT socket with nothing else plugged in - made no difference.

The fastest I've had so far is 855Kbps. I know this is miles faster than dial-up but I would like more speed for my money!!!! Smiley

I have raised a ticket but all that said was to disable my firewallHuh I have Norton Internet Security 2003 on all PC's. Dont like the idea for not having a firewall.

Any suggestions please?

Speed Test Result
http://www.adslguide.org.uk/tools/speedchart.asp?id=5dfa805cfad86419ea5dfa805c

Tweak Result
http://monitor.dslreports.com/tweak/block:1b7af64?service=dsl&speed=1048&os=winXP&via=pppoA
24 REPLIES
N/A

Slow Connection Speeds

Have you performed any speed tests with the firewall disabled.

THere is very little risk involved, provided you have all spyware and virus scans, you should be safe enough to perform one test/
mitchell20
Grafter
Posts: 424
Registered: 30-07-2007

Slow Connection Speeds

Yep just tried disabling firewall on both PC and on router - no difference

Also tried a different filter - was currently using the filter supplied by Netgear plugged into router and speed touch ones every where else - again no difference seen
Community Veteran
Posts: 14,469
Registered: 30-07-2007

Slow Connection Speeds

What firmware version are you running in the router?
mitchell20
Grafter
Posts: 424
Registered: 30-07-2007

Slow Connection Speeds

1.03.00
N/A

Slow Connection Speeds

lo,try a download from +net file vaults,if you are maintaining anything over 100k i would be happy,do one of the larger downloads that will allow time for download to stabilise.if u use p2p file sharing prog's these will give wildly varying download speeds.im not a great believer in actual speedtests for connection speed,the proof is usually in the speed you can download at.perform downloads at different times as well,if you constantly get speeds slower than 100k then you more than likely have a problem.if as you say your exchange has just been enabled it would be unlikely to be contention causing your problem.
N/A

Slow Connection Speeds

Can I ask you to try something that may seem really odd-ball:

Set your
MTU=1500
RWIN= 8760 (yes, 8760)
Window Scaling = no
Time stamping = no
Selective Acks = yes
Path MTU Discovery = yes
Black Hole detection = no
Max duplicate acks = 2
TTL = 64

and give it another try.
I, along with at least two others over on AG have found that this has lifted my D/L speeds from the mid-800's to the mid-900's. They were great up until somewhen in January, but got worse overnight (maybe to do with my Exchange being "upgraded").

Nobody else will believe me since, I admit, it sounds VERY counter-intuitive to have such a low RWIN.

I'd be interested to know the results.
Plusnet Staff
Plusnet Staff
Posts: 12,169
Thanks: 18
Fixes: 1
Registered: 04-04-2007

Slow Connection Speeds

Hi,

What values of MTU and RWIN have you tried? DSLReports is recommending lowering the RWIN value, make sure you reboot both PC and router after each change.
Disabling Path MTU Discovery may also help.
N/A

Slow Connection Speeds

my speeds fine and i've never had to play about with values.
N/A

Slow Connection Speeds

Ccherrington when you set such a low RWIN what kind
of speeds do you get on DSLReports speedtest ?
If you take a speedtest on say speakeasy server
for your current value and one for the value 31636 ?
My guess is that your speeds will plummet when using
such a low RWIN due to the higher latencies, It does on my
512k line but would be interested to hear what happens on 1meg.
Alec
N/A

Slow Connection Speeds

Hi Aleca,

OK, just done some testing and the results are interesting...

MTU=1500, RWIN=32120
-----------------------------------
Speakeasy speedtest: 562Kb/s (this is a 1Mb/s line !!)
PlusNet speedtest: 891.6Kb/s
AG speedtest: 835 Kb/s (actual)

MTU=1500, RWIN=8760
----------------------------------
Speakeasy speedtest: 531Kb/s
PlusNet speedtest: 966.1 Kb/s
AG Speedtest: 931Kb/s (actual)

So, I stick with my proposition that, all of a sudden, for some unaccountable reason, a really low RWIN is working best for me.

Confused :?

Chris
N/A

Slow Connection Speeds

You may be eliminating packet loss by reducing
your RWIN to a point whereby it actually slows
your connection, but the actual reduction in packet loss
causes your speeds to jump back up (now Im confusing myself).
The ADSLguide and Plusnet tests are low latency very easy tests
to take so reducing RWIN doesn't affect the test and the reduction
in packet loss causes an increase in speed.
The ADSLguide speedtest is a higher latency test so
a lower speed is to be expected, but the overall
reduction in RWIN is causing a slowdown to your line,
which the reduction in packet loss cannot make up for.
I don't personally think it's a long term solution, it boils
down to BT and contention again.
I suspect you may be getting higher pings aswell but anyhow
if it's improving your overall line performance that's what matters.
Regards,
Alec
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Slow Connection Speeds

Speakeasy is of course a U.S ISP, so the route will have a pronounced effect.
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Slow Connection Speeds

Yes, you will never get your full speed on the
speakeasy test due to the long distance high latency,
you may get 600-700kb/s but you will not achieve this
without a higher RWIN setting.
The plusnet test is a direct link to your ISP so the
highest speeds are to be expected, reducing RWIN
shouldn't make much difference due to the very low latency,
so the key factor might be packet loss.
Results are a lot clearer on lines that are not subject to
so much packet loss and exchange issues.
mitchell20
Grafter
Posts: 424
Registered: 30-07-2007

Slow Connection Speeds

Still no improvement - tried all combinations of RWIN from 31636 down in multiples of 1438

My download transfer rate less than 100 (about 96.4)