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Possible Fix for Users Experiencing the Slow Speeds

N/A

Possible Fix for Users Experiencing the Slow Speeds

This fix was originally posted by Steve H, in reply to one of my posts on this forum.

Modify the following settings to match below

MTU to 1458 and RWIN to 14180

I used a little proggy called TCPOptimizer to do this and can verify the difference it made was amazing.

Please remember to reboot after the changes

Hope this fixes it for others


Ali
11 REPLIES
N/A

RE: Possible Fix for Users Experiencing the Slow Speeds

Tried that as it looks logical in what they are saying, however.........

27 October 2002 at 18:22:34.

Your Connection

Direction Actual Speed True Speed
Downstream 149 Kbps (18.6 KB/sec) 171 Kbps (inc. overheads)
Upstream 51 Kbps (6.4 KB/sec) 58 Kbps (inc. overheads)

Still not worth subscription or reliable enough to play my favourite game, especially as I money for each game, which I lose if I get cut off or time out.

So back to Plus Net and crossed fingers........

A better idea may be removing the 3rd fat pipe and putting things back to when there was just two, as no-one seemed to have a problem then.........
N/A

RE: Possible Fix for Users Experiencing the Slow Speeds

> This fix was originally posted by Steve H, in reply to one of my posts on this forum.
>
> Modify the following settings to match below
>
> MTU to 1458 and RWIN to 14180
>
> I used a little proggy called TCPOptimizer to do this and can verify the difference it made was amazing.
>
> Please remember to reboot after the changes
>
> Hope this fixes it for others
>
>
> Ali
>

tried it, if it done anything at all it made my connection even worse.
N/A

RE: Possible Fix for Users Experiencing the Slow Speeds

> Modify the following settings to match below
>
> MTU to 1458 and RWIN to 14180

Reducing MTU to 1458 has definitely improved my speed test results, but I still have not seen an explanation of why this is the case.
rikmoncur
Grafter
Posts: 136
Registered: 04-08-2007

RE: Possible Fix for Users Experiencing the Slow Speeds

I used the program and the settings mentioned here and it works! Still not getting full speed but a huge improvement.
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RE: Possible Fix for Users Experiencing the Slow Speeds

Obviously this is just a fix, it still doesnt explain why the default MTU of 1500 is no longer any good and leads to complete TCP fragmentation.
But at least my speeds are now consistently high, last test was 234 up/459 down.
And gamespy now works properly as well.
Lets hope it lasts and they fix the actual cause of the problem.
Ali
N/A

RE: Possible Fix for Users Experiencing the Slow Speeds

I mentioned a while ago,
if you download System Mechanic
from www.iolo.com

It has loads of tools for clearing out your pc.

But also Net Booster aswell,
you can alter the setting manually like you have done, or it does it automatic for ADSL etc..
Plus if you mess it up.. you can restore all the settings back to normal.

It lets you do a upload/download test(s) too.
and get realtime results. and read the logs.

Check that out. it's a 30 day trial, or 30 dollars if you want a key. i have had this 1 year now, and no complaints on what it can do. you get new version updates every few months.

========================================
SESSION START: 28/10/2002 04:51:21
========================================

Start Test: 28/10/2002 04:52:02
Test Type: Download 1 megabyte
Operating System: Windows XP
-------------Settings Used------------
[D-Link DSL-200 USB ADSL Modem(WAN)] Maximum Transfer Unit: 1500
[Realtek RTL8139/810X Family Fast Ethernet NIC] Maximum Transfer Unit: 1500
[1394 Net Adapter] Maximum Transfer Unit: 1500
Tcp Receive Window: 256960
Time To Live: 64
Black Hole Detection: False
Auto-Detect Maximum Transfer Unit: True
Maximum number of simultaneous HTTP 1.0 Connections: 10
Maximum number of simultaneous HTTP 1.1 Connections: 8
Tcp Options: 1 - Window Scaling but no Timestamp Options
Fast Retransmission and Recovery support value: 3
Support for Selective Acknowledgements: True
---------------------------------------------
Data Transfer Start: 28/10/2002 04:52:03
Data Transfer Complete: 28/10/2002 04:52:24
--->Total Data Received: 1023.41 kilobytes
--->Time to Complete Transfer: 00:00:20:500
--->Average Speed: 49.81 kilobytes per second
--->Peak Speed: 116.66 kilobytes per second
--
Jason
=====
N/A

RE: Possible Fix for Users Experiencing the Slow Speeds

I've watched the Adslguide forum with interest over the past month not having any speed problems, until a computer upgrade with win2k pro and speedtouch 510 router installed. Guess what upload speed down to 30 - 75kbps.

Tried the MTU fix last night and my upload is back up to 240kbps (download 470kbps). I did have trouble getting the MTU to take after a reboot, so re-check your MTU value on www.dslreports.com just to make sure.

Cliff
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RE: Possible Fix for Users Experiencing the Slow Speeds

Well i just tested on dslreports.com
i ran the test and it says i need to Choose RWIN between 5808 and 13068.

At moment System Mechanic has it all set.
and i'm OK on upload and download.
it's just the upload, only uploads a max of 30 mins if im lucky then throttles down to nothing.
and im not even downloading anything at same time.
just uploading to a RealServer on spotlife.com for streaming media.

My report is below.. im unsure if i should change it, as i don't want to wreck anything.


http://monitor.dslreports.com/tweak/block:412941f?service=dsl&speed=512&os=winXP&via=pppoA


Anyway id PlusNet would reconise this fault we shouldnt have to change settings.. im fed up with them ignoring our complaints on this same issue regarding uploading that drags on and on.

I first reported this direct to them about 3 weeks ago.. and was told it b/c i live borderline with exchange on RASDL.. which is not true, and my speeds were great like everyone elses until recently. so it's not the RADSL issue. PlusNet wont look into this.. why? and why not answer people on here anymore? my download is OK, it varies just like everyone else.. but the main concern for me is upstream. and why they keep killing it every 30 mins when i do it.

*sighs*
--
Jason
=====
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RE: Possible Fix for Users Experiencing the Slow Speeds

> Anyway id PlusNet would reconise this fault we shouldnt have to change settings.. im fed up with them ignoring our complaints on this same issue regarding uploading that drags on and on.

The following message was posted today in the Plusnet Technologies forum on ADSLguide:

Hi Guys,

We are preparing an annoucement regarding changes we are going to make to our network and DSL platform on Wednesday morning. We are confident that this is going to address the speed issues some customers are reporting. Once we have got that out of the way we will fully investigate the suggestions here regarding MTU size and will produce suitable annoucements and Portal content should this prove to be an effective solution.

Thanks for bearing with us on this one - As I say, further information is on its way!

Regards,

Ian Wild
PlusNet Customer Support
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RE: Possible Fix for Users Experiencing the Slow Speeds

According to ADSLguide, setting MTU to 1458 is what has been recommended by BT Wholesale. For more information, have a look at http://www.adslguide.org.uk/guide/mtu.asp.
colorado
Dabbler
Posts: 23
Registered: 30-07-2007

RE: Possible Fix for Users Experiencing the Slow Speeds

> This fix was originally posted by Steve H, in reply to one of my posts on this forum.
>
> Modify the following settings to match below
>
> MTU to 1458 and RWIN to 14180
>
> I used a little proggy called TCPOptimizer to do this and can verify the difference it made was amazing.
>
> Please remember to reboot after the changes
>
> Hope this fixes it for others
>
>
> Ali
>
Well all I can say is thank you very much!!!!

Before you posted I was getting download speeds of 40k, my modem was quicker. Now, well see for yourself:

Downstream 471 Kbps (58.9 KB/sec) 541 Kbps (inc. overheads)
Upstream 236 Kbps (29.5 KB/sec) 271 Kbps (inc. overheads)

This is what broadband is all about.

Hope PlusNet put this info on the site, we should NOT have to come into forums to discover basic solutions like this.

Thanks again for the info