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Broadband speed on laptop 1/2 of speed on desktop

Posted on 2004-09-13
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Last Modified: 2013-12-14
I have a cable modem which i have connected to my desktop. I usually get download speeds of 500-600 KBS. I have recently purched a laptop which is much better than my desktop. I have connected the modem directly o it yet i get speeds usually 1/2 from exactly the same test site, or download site at smae time of day. I cannot for the life of me figure it out.

Any Ideas?
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Question by:mmackinnon123
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by:Fatal_Exception
ID: 12050457
Are you running the same Operating Systems?  

You are welcome to  read an article on Adjusting Your Send/Receive Window Size from my website:

www.doverproductions.com

or the direct link is here:
 
http://65.24.134.81/KipSolutions/AdjustTCPWindow/AdjustTCPWindow.htm
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by:mmackinnon123
ID: 12051271
On my desktop i am running win xp pro and my laptop win xp home, however, the speeds on my desktop are the same as they were when i had XP home on it before (had to buy another copy for my desktop when i installed home on my laptop).

I have played with the reg tweak a bit, however, i have found this tweak usually only makes minor differences. I am runnin 300 KBs short on my laptop through the exact same connection even using the tweaks and playing with the values. There is something limiting my bandwidth on the laptop side and for the life of me i dunno what it is. I have played with duplex setting as well with no luck.
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by:Fatal_Exception
ID: 12054277
Is there anything else different between the two?  Like Service Packs?
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by:mmackinnon123
ID: 12056031
No sir.

The only difference is the hardware. The laptop is newer with more ram and a faster processor. I thought at first it was my wireless g card, but i have the exact symptoms through the ethernet, which suggests to me drivers or software. I believe i have replaced all the drivers.

I bought this laptop new with nothing installed since i had my own win xp pro. I did install all the drivers from their disk as well as updated to new ones. I cant even imagine what this could be.
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by:Fatal_Exception
ID: 12058824
Wifi tends to be slower, even when using the G protocol, since there is much more packet overhead in a Wifi LAN, but this does baffle one, eh?  You could try the TCPOptimizer to see if that would help..  (personally, I believe something is throttling your bandwidth on that laptop..)  You might take a look at the other Broadband tweaks they have available on this page..

http://www.speedguide.net/downloads.php



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by:mmackinnon123
ID: 12059038
i tried your origional suggestion, but no real change. I will take a peek at the website and see what else i can try. Any other ideas?
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by:Fatal_Exception
ID: 12059498
I am running out of ideas on this one...  But if I think of anything I will certainly post back..!!
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by:mmackinnon123
ID: 12060361
i appreciate your help, if i can figure it out ill post here as well. I have even disabled QOS just to see if there was a difference. no luck
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by:Fatal_Exception
ID: 12060527
I would be interested in any results that you get.. even the experts come here to learn..  :)  
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by:mmackinnon123
ID: 12071445
I think my next step is to test speeds on a different connection at a differen t location. Although i cannot think of any reason why my cable modem may be slower for my laptop as opposed to desktop, doing that then totally narrows it down to my laptop.

Seems it has to be a driver or software issue cause i havent had bad packets so it is working well. i dunno. very odd.
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Author Comment

by:mmackinnon123
ID: 12071459
ok interesting update

At work i hooked up to our inet connection with a crossover cable and shared the internet connection. Oddly, i got exactly the same speeds through the speed tests. When i go home i am going to try this same thing via crossover and see if it does the same.

Some little things:

1) work is slow (30 Kbs) inet connection, so may limit the speed. It is possible if there is some sort of speed limiting going on via my laptop it doesent hapen until after a certain speed.

2) if this works it then brings me to a whole new level of confusion about what the hell is going on. I have tried multiple ethernet cables thinking that was the issue (ie: same one i use on desktop straight to laptop-cable modem) and speed is still decreased by 1/2.

Ill update tommorrow and see if the crossover inet sharing idea works.

mike
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by:Fatal_Exception
ID: 12071503
Look forward to hearing about it..  Till tomorrow..  
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by:mmackinnon123
ID: 12075533
very very  odd.

At home i tried the crossover cale and get the same results as i did with the direct connection to the cable modem, 1/2 the bandwidth. Today i am going to call cox cable and se if they have any ideas as to why this may be happening. I dont have any great expectation, but at this point it ant hurt.

Do you know of any way my laptop might be limited either by the cable modem or their side?
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by:Fatal_Exception
ID: 12076989
It is possible to throttle bandwidth on a NIC, althought the registry setting is meant for dual NIC systems..  I have it somewhere in my notes, but I will need to dig very deep to find them...  (I have over 100 pages on XP alone...  :)
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by:mmackinnon123
ID: 12077103
hey i appreciate your help!
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Fatal_Exception earned 125 total points
ID: 12077413
Ok, found it, but I doubt it is specific to your problem.    Again, this is for a multihomed system..  But it is a nice tweak to put in a toolbox for later use...  Sorry it is not going to help here...

If you have two or more network adapter cards in your system, you can use a randomizing algorithm to distribute the number of connections or sessions among the adapters. To use the algorithm, perform the following steps:

Start the registry editor (e.g., regedit.exe).
Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NetBT\Parameters.
From the Edit menu, select New - DWORD value.
Enter a name of RandomAdapter, and press Enter.
Double-click the new value, enter 1 to enable or 0 to disable, and click OK.
Close the registry editor.
Reboot the machine.
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by:Fatal_Exception
ID: 12077439
And, just in case anyone else is interested in that regedit..  here is what it does..

Specifies how NetBIOS over TCP/IP (NetBT) chooses the IP address to put in a name query. If the value of this entry is 1, then NetBT randomly chooses an IP address from all of its bound interfaces. If this entry is 0 or is absent from the registry, then NetBT uses the address of the interface on which the query arrived.

This entry is applicable only to multihomed computers. This feature is used by servers with multiple interfaces on the same network for load balancing. This entry does not exist in the registry by default, and you must add it if you want to configure NetBT to randomly choose an IP address from its available interfaces.
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