question about window size(receiver buffer) of iperf

[Mitch Kutzko <mitch --at-- ncsa.uiuc.edu>]

>From: "Yung Yi" <yi --at-- ece.utexas.edu>
>To: <dast --at-- nlanr.net>
>Subject: question about window size(receiver buffer) of iperf
>Date: Mon, 28 Jul 2003 02:39:16 -0500
>
>Dear dast,
>
>I have a question about window size(receiver buffer) change of iperf 1.7.1.
>
>When I change the window size of iperf(server mode) using -w option,
>there are some warning messages like this.
>
>[root --at-- fluidsim iperf-1.7.0]# ./iperf -s -w 1024K
>Receiver buffer is set to 1048576
>------------------------------------------------------------
>Server listening on TCP port 5001
>TCP window size:  128 KByte (WARNING: requested 1.00 MByte)
>------------------------------------------------------------
>
>The above message means that it's really changed into 1024K but it's too
>large(warning) or it's not changed and the program uses 128K window size.
>
>The reason why I ask is that the sender in my network does not increase it's
>sending speed due to the limitation of receiver window size.
>
>Best Regards,
>Yung Yi.
>