Date: Mon, 19 Nov 2001 01:24:48 -0500 (EST) From: Nguyen-Tuong Long Le <le@cs.unc.edu> To: freebsd-hackers@freebsd.org Subject: Periodic tasks ? Message-ID: <Pine.GSO.4.10.10111190123190.26115-100000@capefear.cs.unc.edu>
next in thread | raw e-mail | index | archive | help
Hi all, I originally posted my question on freebsd-net but couldn't find any help. I'm posing my question here because someone suggested that my problem might not be a networking problem: 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). I use the FIFO queueing discipline and the userland tools that come with the ALTQ package. The routers are PII 300 MHz (Dell Dimension XPS 300) with Intel Etherpro network cards. 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-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.GSO.4.10.10111190123190.26115-100000>