<html><body bgcolor="#FFFFFF"><div>Yes the default behavior under windows has been to set tcp window scaling for quite some time. However I had the pcap files to prove it wasn't being set for that app. </div><div><br></div><div>Even with that and other evidence it took a long time for them to come around to the idea that latency can actually impact transfer speeds. "But it works fast here, it must be your Internet connection" etc. Even pointing out that I had over 50 mbit/s of spare outbound didn't stop them telling me that repeatedly. </div><div><br></div><div>How they managed to overide the default tcp socket settings without realising, I will never know. I gave up trying as it wasn't worth my time. </div><div>A </div><div>Craig. <br><br><div><br></div></div><div><br>On 19/06/2010, at 7:41 PM, Dmitri Kalintsev <<a href="mailto:dek735@gmail.com">dek735@gmail.com</a>> wrote:<br><br></div><div></div><blockquote type="cite"><div>Craig,<br><br>If I'm not mistaken, Windows isn't any different - tcp window is handled on the OS level, by the TCP stack. Application can't do anything about it.<br><br><div class="gmail_quote">On Fri, Jun 18, 2010 at 4:56 PM, <span dir="ltr"><<a href="mailto:craig@askings.com.au"><a href="mailto:craig@askings.com.au">craig@askings.com.au</a></a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div class="im">> On Fri, Jun 18, 2010 at 4:24 PM, <<a href="mailto:craig@askings.com.au"><a href="mailto:craig@askings.com.au">craig@askings.com.au</a></a>> wrote:<br>
</div><div class="im">> Say again? Don't you set these things in the TCP stack - i.e., the<br>
> kernel - rather than the application?<br>
><br>
> e.g., echo 1 > /proc/net/ipv4/tcp_window_scaling # linux<br>
<br>
</div>It was a Windows desktop app. I could prove using scapy that their servers<br>
honored window scaling when it was requested, but for some reason their<br>
app never did.<br></blockquote><div><br>-- D <br></div></div>
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