> I mean I have on my server in Canada IIS and our ICS server. When I > download from there with high latency and high bandwidth,
On the same physical hardware with different ports or IPs? IIS runs as a kernel driver, so is more efficient than Windows applications. >I had read that I need to increase window size. I have > made it 128KB and now the download speed is 180KB/s. So it's now much slower? The difference could be down to TCP settings, with slow latency the round trip time to acknowledge packets causes the speed to slow down, so allowing TCP to send more packets without waiting for ACK packets speeds things up. On my WAN, I've tested downloads from the ICS FTP server with the ICS FTP client at almost 500Mbits/s, and I can download from (decent) low latency (10ms) public FTP servers at over 50Mbits/s which is my maximum cable modem speed. That's with 64K TCP buffers. But I can not test the ICS web server at those speeds, I have an old firewall in front of my public server which limits the maximum speed to about 15Mbits/s. IIS7 - http://www.magsys.co.uk/download/testing/speed50meg.zip ICS v7 - http://www.telecom-tariffs.co.uk/testing/speed50meg.zip ICS is slower but is still using the default 8K TCP sockets, not got around to increasing the TCP buffer size yet, do most testing with FTP. Angus -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
