From owner-freebsd-net@FreeBSD.ORG Tue May 23 19:26:46 2006 Return-Path: X-Original-To: freebsd-net@freebsd.org Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 1B72B16AAB2 for ; Tue, 23 May 2006 19:26:46 +0000 (UTC) (envelope-from bmah@freebsd.org) Received: from a.mail.sonic.net (a.mail.sonic.net [64.142.16.245]) by mx1.FreeBSD.org (Postfix) with ESMTP id 34FAD43D7C for ; Tue, 23 May 2006 19:26:41 +0000 (GMT) (envelope-from bmah@freebsd.org) Received: from [192.168.26.156] (64-84-9-2-sf-gw.ncircle.com [64.84.9.2]) (authenticated bits=0) by a.mail.sonic.net (8.13.6/8.13.3) with ESMTP id k4NJQb8i020331 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 23 May 2006 12:26:40 -0700 Message-ID: <447361E5.3040603@freebsd.org> Date: Tue, 23 May 2006 12:26:29 -0700 From: "Bruce A. Mah" User-Agent: Thunderbird 1.5.0.2 (X11/20060424) MIME-Version: 1.0 To: mallman@icir.org References: <20060523185715.E0229416D24@lawyers.icir.org> In-Reply-To: <20060523185715.E0229416D24@lawyers.icir.org> X-Enigmail-Version: 0.94.0.0 OpenPGP: id=5ba052c3 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig30FEE3E9A0E4AA74A4433B8C" Cc: freebsd-net@freebsd.org, Marcin Jessa , mag@intron.ac Subject: Re: How to Quicken TCP Re-transmission? 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: Tue, 23 May 2006 19:27:02 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig30FEE3E9A0E4AA74A4433B8C Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable If memory serves me right, Mark Allman wrote: >> Thank you for your reminder. Actually, I understand you and >> RFC 2018. What I really concern is how wide support (and being enabled= >> by default) SACK has obtained. For we do not always transfer data >> between hosts running FreeBSD and maintained by network expert. >=20 > SACK is quite widely deployed. See: >=20 > Alberto Medina, Mark Allman, Sally Floyd. Measuring the Evolution of= > Transport Protocols in the Internet. ACM Computer Communication > Review, 35(2), April 2005. > http://www.icir.org/mallman/papers/tcp-evo-ccr05.ps What a trip, I just read this paper on the train to work this morning. FWIW, I thought this was a well-done study on an interesting topic. A question and a nitpick: Did you try doing any stack fingerprinting to get some idea of the mix of TCP/IP stacks among the servers / clients you examined? The percentages in the commentary on Table 5 in the text (second column of p. 41 in the CCR printing) are sometimes one-off from the percentages actually shown in Table 5. It took me several tries to get through the "huh?!?"-ness of this, though the lack of caffeine in my bloodstream at the time might have been a contributing factor. :-) Cheers, Bruce. --------------enig30FEE3E9A0E4AA74A4433B8C Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFEc2Hq2MoxcVugUsMRAohGAJ9gE8ypS1quauro2ZnR8jtGxdhM5gCeKbT5 4o3RBCnOdes1SN7UFEOUBMI= =/3g8 -----END PGP SIGNATURE----- --------------enig30FEE3E9A0E4AA74A4433B8C--