> You don't mention the OS, but from your previous emails to the iperf > and netperf lists, I suspect that you're runnnig on Linux. If so, be > aware that Linux doubles the requested socket buffer / TCP window > sizes for resource accounting reasons. So when an application > requests a 32KB socket buffer, the kernel actually allows up to 64KB. > This is a fairly well known quirk of the Linux stack. > > The Linux TCP window auto-tuning is quite good, and in general it is > best not to try to manually tune the window size. Eg, it is often > best to avoid specifying the -w argument on Linux. > > Drew >
Yeah, I run it on Linux. I can understand what you say. So I can't exactly say use only xxx Bytes because the stack do some things... My problem is that I want to compare the behaviour of TCP and SCTP. And if I use the -w option in iperf or in netperf with the sctp protocol that is really the maximum advertised received window size. But now I want to do the same in TCP and I configured it so and the throughput is much better because the server can receive more bytes than the sctp. Perhaps do you have an idea how I can do the test? I think to set the windowsize to the half that the kernel than double this value is not really a solution. Because in my test the windowsize of the server never reach the maximum values and I tried is with a lot of differents. Regards Frank ______________________________________________________ GRATIS für alle WEB.DE-Nutzer: Die maxdome Movie-FLAT! Jetzt freischalten unter http://movieflat.web.de ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Iperf-users mailing list Iperf-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/iperf-users
