From owner-freebsd-net Fri Nov 16 12:33: 1 2001 Delivered-To: freebsd-net@freebsd.org Received: from wren.cs.unc.edu (wren.cs.unc.edu [152.2.128.86]) by hub.freebsd.org (Postfix) with ESMTP id C252C37B41B for ; Fri, 16 Nov 2001 12:32:56 -0800 (PST) Received: from le-cs.cs.unc.edu (IDENT:le@le-cs.cs.unc.edu [152.2.131.150]) by wren.cs.unc.edu (8.9.3/8.9.3) with ESMTP id PAA18651 for ; Fri, 16 Nov 2001 15:32:53 -0500 (EST) Date: Fri, 16 Nov 2001 15:32:53 -0500 (EST) From: Nguyen-Tuong Long Le To: Subject: Periodic task Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org Hi all, I run experiments to measure the stability of router queue length. In my experiment set up, I have 7 clients and 7 servers connected to a router via an ELS-100 switch. The 7 clients and 7 servers establish long-lived TCP connections and saturate the router's 10 Mbit link. All machines run FreeBSD 4.3 with the router having the ALTQ 3.0 patch (http://www.csl.sony.co.jp/person/kjc/programs.html). There seems to be some periodic tasks that occur every 20 minutes and draws the queue length to 0. I run several experiments and consistently observe the same pattern. I don't have any cron job on the machines. I have a graph of the router's queue length at http://www.cs.unc.edu/~le/tmp/qlen.png Does anyone know what the problem is and how to solve it? Please kindly reply to me because I am not on the list. Thanks, Long To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message