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Speed Difference

donj53
Grafter
Posts: 77
Registered: 06-08-2007

Speed Difference

This isn't a complaint but I wonder if anybody can explain these results on the plusnet speedtest.The first three results are from one computer running XP with a 54Mb wireless connection and the next three from a computer running Vista with a 54Mb wireless connection.
12-10-2007 21:15:28  4091
12-10-2007 21:15:14 4400.4
12-10-2007 21:14:59 4240.2
12-10-2007 21:12:23 2121.6
12-10-2007 21:11:54 2119.1
12-10-2007 21:11:29 2111.8
7 REPLIES
Community Veteran
Posts: 3,789
Registered: 08-06-2007

Re: Speed Difference

Silly question.  Were you playing music on the Vista machine when doing the speed test?
B.
Community Veteran
Posts: 14,469
Registered: 30-07-2007

Re: Speed Difference

Are you fully patched with Vista as it did have some network performance issues on its initial release.
I assume if you do the test on the XP machine again it gives the original speeds?
donj53
Grafter
Posts: 77
Registered: 06-08-2007

Re: Speed Difference

The Vista is the fast speeds.Absolutely nothing happening on either machine but different results.
Community Veteran
Posts: 14,469
Registered: 30-07-2007

Re: Speed Difference

Sorry, the timeline is reversed on the table.  Embarrassed
Can't explain the reason for the difference, as I said I would expect vista to be slower  Huh
donj53
Grafter
Posts: 77
Registered: 06-08-2007

Re: Speed Difference

Just to show its not time related I've done a switch back and forth.
13-10-2007 01:16:44  5216.6
13-10-2007 01:16:25 2174
13-10-2007 01:16:02 5225.9
13-10-2007 01:15:43 2165.6
13-10-2007 01:15:16 5260.3
13-10-2007 01:14:14 2152.8
As I say not a complaint as either speed is pretty good but how does it happen.Both wireless adaptors have 54Mb and excellent signals and both machines are side by side.
Superuser
Superuser
Posts: 9,583
Thanks: 958
Fixes: 55
Registered: 06-04-2007

Re: Speed Difference

I too misinterpreted which were the "first three" initially, taking position in the list rather than time.  Having resolved that I have a possible explanation, the Receive Window (RWIN).
Vista dynamically optimises this on the fly based on the actual datagram throughput.  Essentially XP doesn't, and if the default value for the connection is being used it will be much too small.
On the XP computer I suggest you first run a tweaktest at DSLreports.  For the results use DSL, 6000, WinXP and normal.
The tweak results make recommendation for improving throughput.  However, if you want guidance from us please post the URL you will be given in small letters near the bottom of the results page.  For tweaking RWIN (and possibly MTU) you will need to download DrTCP (choose the ".exe" file, it's only 52.5kB).
David
James
Grafter
Posts: 21,036
Registered: 04-04-2007

Re: Speed Difference

I would also recommend not using the speed test on the portal and trying to use http://www.mybroadbandspeed.co.uk instead.