From owner-freebsd-chat Mon Mar 25 15:41:31 2002 Delivered-To: freebsd-chat@freebsd.org Received: from avocet.prod.itd.earthlink.net (avocet.mail.pas.earthlink.net [207.217.120.50]) by hub.freebsd.org (Postfix) with ESMTP id 2D3A937B417 for ; Mon, 25 Mar 2002 15:39:16 -0800 (PST) Received: from pool0459.cvx22-bradley.dialup.earthlink.net ([209.179.199.204] helo=mindspring.com) by avocet.prod.itd.earthlink.net with esmtp (Exim 3.33 #1) id 16pe3C-000729-00; Mon, 25 Mar 2002 15:38:55 -0800 Message-ID: <3C9FB4FA.6956C219@mindspring.com> Date: Mon, 25 Mar 2002 15:38:34 -0800 From: Terry Lambert X-Mailer: Mozilla 4.7 [en]C-CCK-MCD {Sony} (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: Brad Knowles Cc: Dag-Erling Smorgrav , Taylor Dondich , chat@freebsd.org Subject: Re: qmail (Was: Maintaining Access Control Lists ) References: <20020323002608.B20699@rain.macguire.net> <3C9C84CF.2090300@flash.net> <20020323084327.A354@rain.macguire.net> <3C9DF87D.5050306@cream.org> <000c01c1d3ab$6d2c6960$6600a8c0@penguin> <3C9F1EF6.CB28EDD7@mindspring.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-chat@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org Brad Knowles wrote: [ ... Per domain mail queues ... ] > > If you do wedge them in, then on an ETRN/ATRN, you are > > guaranteed a 100% hit rate on queue messages, instead of > > just the percentage of the main queue of the messages for > > a particular domain. > > Indeed, that is a problem. And if you get 50-60 ETRN requests > per second (as our business-class mail server was getting), this > causes untold amounts of unholy hell. With them in place, we handled as much email as Best Internet's primary list server handled in a month in just under 48 hours, on one 166 MHz dual processor PPC box (our test box), with 10,000 virtual domains, 5,000 using ETRN/ATRN, and 5,000 acting as "queue-only" only in the case of an outage of the primary mail server for the domain. That's over half a million 10k messages every 24 hours. We believed that our final deployment would scale at 50,000 virtual domains per node, all using ETRN/ATRN. At that point, it was all about FS latency, which was much lower on a journalled FS with btree directory structure than it would be on FreeBSD. Gotta love sendmail... 8-) 8-). -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message