From owner-freebsd-stable@FreeBSD.ORG Thu Feb 18 21:41:45 2010 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 3EC131065694 for ; Thu, 18 Feb 2010 21:41:45 +0000 (UTC) (envelope-from h.schmalzbauer@omnilan.de) Received: from host.omnilan.net (host.omnilan.net [62.245.232.135]) by mx1.freebsd.org (Postfix) with ESMTP id B8D9F8FC16 for ; Thu, 18 Feb 2010 21:41:44 +0000 (UTC) Received: from titan.flintsbach.schmalzbauer.de (titan.flintsbach.schmalzbauer.de [172.21.1.150]) (authenticated bits=0) by host.omnilan.net (8.13.8/8.13.8) with ESMTP id o1ILfesC043901 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 18 Feb 2010 22:41:40 +0100 (CET) (envelope-from h.schmalzbauer@omnilan.de) Message-ID: <4B7DB408.9010706@omnilan.de> Date: Thu, 18 Feb 2010 22:41:28 +0100 From: Harald Schmalzbauer Organization: OmniLAN User-Agent: Thunderbird 2.0.0.23 (X11/20090906) MIME-Version: 1.0 To: Kevin Oberman References: <20100218192320.B34251CC09@ptavv.es.net> In-Reply-To: <20100218192320.B34251CC09@ptavv.es.net> X-Enigmail-Version: 0.95.6 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigEDFBD674DA051D5C5011184D" Cc: Patrick Mahan , freebsd-stable@freebsd.org, Stephen Hurd Subject: Re: RELENG_8 ignoring TCP window size? [Was: Re: Help for TCP understanding wanted, ACK-MSS-Window [Was: Re: best practice to watch TCP parms of established sockets]] X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Feb 2010 21:41:45 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigEDFBD674DA051D5C5011184D Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: quoted-printable Kevin Oberman schrieb am 18.02.2010 20:23 (localtime): =2E.. > window allows for many packets to be in flight and with a 3 Gbps flow, > that is a LOT of data. While an ACK is sent every two packets of > received data, the transmitting side does not wait for the ACKs. It =2E.. > That is a VERY simple and incomplete explanation of what is happening > with the window, but most of that is irrelevant in local transfers with= Thanks a lot, then I understood it at least half correct ;) My=20 missunderstanding was that I thought the receiver would reduce ACKs...=20 Now I know more :) But unfortunately that makes it more mysterious where the throughput=20 problem lies... Thanks to everyone so far, -Harry --------------enigEDFBD674DA051D5C5011184D Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.13 (FreeBSD) iEYEARECAAYFAkt9tBQACgkQLDqVQ9VXb8i3YwCggQEo/kEyKDdb3TxU7hTzhQfm i2gAoKs+4d2XbG3NtN1b9rgu6zJVC7vD =2Ckw -----END PGP SIGNATURE----- --------------enigEDFBD674DA051D5C5011184D--