There's an iperf  option to vary this. 

Sent from my BlackBerry 10 smartphone on the Rogers network.
From: Abhay Ravi Chandran
Sent: Monday, May 6, 2013 6:00 PM
To: drivers-networking
Reply To: drivers-networking@community.qnx.com
Subject: TCP Window size

Hi,
I was trying to run iperf with a TCP window size of 256 KB but find that the default window size is limited to 32 KB. Is there any way to change this or is the NetBSD stack limiting the TCP window size to 32 KB.

Thanks
Regards
Abhay



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Networking Drivers
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