Receive Window Auto-Tuning in Windows Vista

[Claus Klein]

Hi,

I have Problems with this new MS feature.

see http://en.wikipedia.org/wiki/TCP_tuning and

https://technet.microsoft.com/en-us/magazine/2007.01.cableguy.aspx

We have a proprietary TCP tunnel with a really long RTT > 3 sec and a MSS of 21 kBytes to an embedded ftp client.

With throttling I tried to not send more than 21 kBytes per 3 seconds -> i.e. 7 kBytes/sec but this was not enough.

Note, this new microsoft feature can't not really disabled for one interface only! 

To prevent a lot of TCP retransmissions and delayed ACK's I should be able to set the socket receive buffer and transmit buffer size.

I have prepared a patch to enable this feature using socket.setsockopt().

Is there someone with experience of TCP throughput tuning and "microsoft next generation TCP stack"?

With Regards

Claus