Windows TCP Performance Tuning Tips

A customer got me interested today in what options are available to tune a Windows workstation to maximize throughput in lower bandwidth connectivity, like an internet connection. The main tuneability that came up was TCP window size. It seems that Windows defaults to a very low TCP window size of 16KB. This should probably be raised to at least 128K to allow for better throughput. It shouldn't hurt anything either, since PC's talking will only raise the TCP window size to the max they can agree on. A good article on this can be found at:

Windows 2000 TCP Performance Tuning Tips

I also got some good information from the iperf tool website. Iperf allows you to test throughput. Down at the bottom of the page are some other sites that provide documentation on maxing out throughput:

Iperf Tool

Windows Registry Settings