From owner-freebsd-questions Wed Jul 2 18:31:31 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id SAA06583 for questions-outgoing; Wed, 2 Jul 1997 18:31:31 -0700 (PDT) Received: from indyweb.cgocable.ca (indyweb.cgocable.ca [205.151.69.200]) by hub.freebsd.org (8.8.5/8.8.5) with SMTP id SAA06578 for ; Wed, 2 Jul 1997 18:31:28 -0700 (PDT) Received: from stargate by indyweb.cgocable.ca via ESMTP (951211.SGI.8.6.12.PATCH1042/940406.SGI.AUTO) for id VAA19311; Wed, 2 Jul 1997 21:29:53 -0400 Message-ID: <33BB00B4.205C5A93@cgocable.ca> Date: Wed, 02 Jul 1997 21:30:28 -0400 From: Sylvain St-Laurent X-Mailer: Mozilla 4.01 [en] (WinNT; I) MIME-Version: 1.0 To: freebsd-questions@freebsd.org Subject: Question about TCP/IP stack implementation. X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-questions@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Hi, I have a 2048 kbits satellite link with a RTT (Round-Trip Time) = 350ms. Usually, the "bandwidth*delay product" give the TCP window size to optimize the link (RFC-1323). Thus, my window size should be approx. 92 KBytes. Do I need to change the window size in FreeBSD 2.1.7.1 ? *** [1] *** If so, how can I set the new window size (and TCP Window Scale Option) in the source code ? *** [1] *** - It's strange, I set the window size to 4096 bytes in the "tcp.h" file, I download with FTP on SGI-IRIX 6.2 server and the window size work, my transfert rate was small (~5.5KB). But, when I download (FTP) with the same window size on FreeBSD 2.1.7.1 server, the window size is ignored. WHY ? What's the difference, in the TCP/IP stack, between IRIX and FreeBSD ? Thanks ====================== Sylvain St-Laurent R&D Director CESART Int.inc. http://www.cesart.com sylvain.st-laurent@cesart.com