RWIN / TCP problem window size

Hello.

I have a problem with Windows Vista Ultimate x 64 - whenever I have try to download anything through IE, Opera and FireFox I get a download speed of a few KB of 30-50, even though I have a 5 Mbit ADSL connection.

Now, I tried also test my download speed on torrents and with managers of download and when I use these I get my full download speed (~ 500 KB)-this is because when I download via torrent or download managers, I have multiple connections to the file so I can get full speed.

So the problem is that I have a strange connection download speed limit (and browsers use only one socket when downloading files). I guess that the melody of Vista Auto is not changing my RWIN or TCP window size, so I need a way to manually change this somehow.

I also tried to turn the auto tuning to restricted and the disabled, but it did not help. Also, when I put it to the test, I have no internet at all.

P.S. I use my Intel DP35DP motherboard integerated network adapter.

Hi SeW800,

We will try a few things here.  First of all, check Intel site and make sure all the drivers for the motherboard and BIOS are up-to-date.

WARNING: Changing the BIOS / semiconductor (CMOS) to complementary metal oxide settings can cause serious problems that may prevent your computer from starting properly. Microsoft cannot guarantee that problems resulting from the configuration of the BIOS/CMOS settings can resolved e. Changes to settings are at your own risk.

Once everything is up to date, you might want to try to enable and disable these settings to see if it will work better:

Provider of Congestion Vista - for TCP connections with a large receive window size and a band bandwidth-delay product, Compound TCP (CTCP) in the TCP/IP stack new generation greatly increases the amount of data sent at a time by monitoring the bandwidth product / time, variations in delay and packet losses. CTCP also ensures that its behavior does not negatively affect other TCP connections. In testing performed internally at Microsoft, large file backup times have been reduced nearly in half for a 1 Gigabit per second connection with a 50 milliseconds round-trip time. Connections with bandwidth product / more time can have even better performance.

Activate - netsh interface tcp set global congestionprovider = ctcp
Disable - netsh interface tcp set global congestionprovider = none

netsh interface tcp set global ecncapability = toggle
netsh interface tcp set global congestionprovider = ctcp / no
netsh interface tcp set global rss = toggle
netsh interface tcp set global autotuninglevel = normal
netsh interface tcp set global chimney = toggle

Thank you

Kevin
Engineer Microsoft Support answers visit our Microsoft answers feedback Forum and let us know what you think.

Tags: Windows

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