From owner-freebsd-net@FreeBSD.ORG Mon Aug 13 18:34:29 2007 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id DACF416A417 for ; Mon, 13 Aug 2007 18:34:29 +0000 (UTC) (envelope-from SRS0=5cc8ce267651958d2877072618eacc9d334ec462=426=es.net=oberman@es.net) Received: from postal1.es.net (postal4.es.net [IPv6:2001:400:6000:1::66]) by mx1.freebsd.org (Postfix) with ESMTP id 2DC3013C458 for ; Mon, 13 Aug 2007 18:34:28 +0000 (UTC) (envelope-from SRS0=5cc8ce267651958d2877072618eacc9d334ec462=426=es.net=oberman@es.net) Received: from ptavv.es.net (ptavv.es.net [198.128.4.29]) by postal4.es.net (Postal Node 4) with ESMTP (SSL) id SAV71827 for ; Mon, 13 Aug 2007 11:34:27 -0700 Received: from ptavv.es.net (ptavv.es.net [127.0.0.1]) by ptavv.es.net (Tachyon Server) with ESMTP id C196D45045 for ; Mon, 13 Aug 2007 11:34:26 -0700 (PDT) To: freebsd-net@freebsd.org Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1187030066_15083P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Mon, 13 Aug 2007 11:34:26 -0700 From: "Kevin Oberman" Message-Id: <20070813183426.C196D45045@ptavv.es.net> Subject: Very high wide area TCP tuning X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 13 Aug 2007 18:34:29 -0000 --==_Exmh_1187030066_15083P Content-Type: text/plain; charset=us-ascii Content-Disposition: inline I am attempting to use a FreeBSD box with either a Myricom or Chelsio 10GE card to generate very large TCP streams over cross-country links. The RTT for the test path is 94 ms. It is dedicated to my testing at this time, so I have no contention other than a few KB of routing updates. Clearly, I need a very large window...about 120 MB, but I am unsure how FreeBSD will handle this. (Unless I do other things, I suspect it will not be pretty.) I imagine I will need a large kvm space, at the least, but are there any other sysctls that are likely to need adjusting to make this all work? IS it likely to work better on a amd64 system than a i386? Any suggestions would be appreciated. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634 Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751 --==_Exmh_1187030066_15083P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) Comment: Exmh version 2.5 06/03/2002 iD8DBQFGwKQykn3rs5h7N1ERAn3xAKC0blxPnlY6mcgsrz10XqInlYl4ZwCgsKjh yJABikt5WHeSARkGBsnxUxI= =2kzw -----END PGP SIGNATURE----- --==_Exmh_1187030066_15083P--