From owner-freebsd-current@FreeBSD.ORG Fri Jan 9 05:25:24 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 669E616A4D0; Fri, 9 Jan 2004 05:25:24 -0800 (PST) Received: from gate1.psi.de (gate1.psi.de [194.115.214.187]) by mx1.FreeBSD.org (Postfix) with ESMTP id 9158943D5C; Fri, 9 Jan 2004 05:25:17 -0800 (PST) (envelope-from thorsten@tgreiner.net) Received: from INFRA-BLN-EX2K.psi.de (host-138.194.115.213.psi.de [194.115.213.138]) by gate1.psi.de (8.11.3/8.11.3) with ESMTP id i09DPEE30488; Fri, 9 Jan 2004 14:25:15 +0100 Received: from infra-nev-exf.psi.de ([194.115.215.7]) by INFRA-BLN-EX2K.psi.de with Microsoft SMTPSVC(5.0.2195.6713); Fri, 9 Jan 2004 14:25:27 +0100 Received: from comm-nev1.nev.psi.de ([194.115.215.40]) by infra-nev-exf.psi.de with Microsoft SMTPSVC(5.0.2195.6713); Fri, 9 Jan 2004 14:25:27 +0100 Received: from localhost. (dhcp245.nev.psi.de [192.168.142.245]) by comm-nev1.nev.psi.de (8.8.8+Sun/8.8.8) with ESMTP id OAA16112; Fri, 9 Jan 2004 14:24:54 +0100 (MET) Received: from localhost. (localhost [127.0.0.1]) by localhost. (8.12.10/8.12.10) with ESMTP id i09DOs7B003279; Fri, 9 Jan 2004 14:24:54 +0100 (CET) (envelope-from thorsten@tgreiner.net) Received: (from thorsten@localhost) by localhost. (8.12.10/8.12.10/Submit) id i09DOssD003278; Fri, 9 Jan 2004 14:24:54 +0100 (CET) (envelope-from thorsten@tgreiner.net) X-Authentication-Warning: localhost.: thorsten set sender to thorsten@tgreiner.net using -f Date: Fri, 9 Jan 2004 14:24:53 +0100 From: Thorsten Greiner To: Andre Oppermann Message-ID: <20040109132453.GD2031@tybalt.nev.psi.de> References: <20040109085522.GB4246@tybalt.nev.psi.de> <3FFE8232.730F70B8@freebsd.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="WChQLJJJfbwij+9x" Content-Disposition: inline In-Reply-To: <3FFE8232.730F70B8@freebsd.org> X-GPG-Fingerprint: ED45 DF41 BE30 6FF5 DC4F 15C3 4538 6598 E865 F66A User-Agent: Mutt/1.5.5.1i X-OriginalArrivalTime: 09 Jan 2004 13:25:27.0116 (UTC) FILETIME=[0B74B0C0:01C3D6B4] cc: Thorsten Greiner cc: current@freebsd.org Subject: Re: the TCP MSS resource exhaustion commit X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 09 Jan 2004 13:25:24 -0000 --WChQLJJJfbwij+9x Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable * Andre Oppermann [2004-01-09 11:34]: > You can simply increase net.inet.tcp.minmssoverload to any > higher value. I suggest 2,000 as next step. If set it to > 0 the check will be disabled entirely. Setting net.inet.tcp.minmssoverload to 4000 fixed my problem(s). > This makes we wonder why the Oracle database server is sending > so many small packets. Is your JBoss application doing connection > pooling (eg. multiplexing multiple SQL sessions over one tcp > session)? It performs connection pooling on the application layer, i.e. it opens several connections and pools them to avoid reopening them. As far as I understand each Oracle connection is associated with a TCP connection - there is no pooling on the TCP level. While I have read your commit message thoroughly I am not sure I have understood the consequences of the new mechanism. Will the exchange of many small packets trigger a connection drop? Best regards -Thorsten --=20 Never attribute to malice what can adequately be explained by incompetence. This message is digitally signed. To verify its integrity, download a copy of GnuPG for your operating system from http://www.gnupg.org . --WChQLJJJfbwij+9x Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQE//qulRThlmOhl9moRAvHYAKDQ74alpOB8FFq5SvHPVIb87T+HfgCeOlRV LrO95GGaCVDyMeS4PVz97E4= =+E8n -----END PGP SIGNATURE----- --WChQLJJJfbwij+9x--