From owner-freebsd-net@FreeBSD.ORG Wed Jul 30 14:58:29 2003 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 5052137B404 for ; Wed, 30 Jul 2003 14:58:29 -0700 (PDT) Received: from cowbert.2y.net (d46h180.public.uconn.edu [137.99.46.180]) by mx1.FreeBSD.org (Postfix) with SMTP id 205A843FB1 for ; Wed, 30 Jul 2003 14:58:28 -0700 (PDT) (envelope-from sirmoo@cowbert.2y.net) Received: (qmail 387 invoked by uid 1001); 30 Jul 2003 21:58:23 -0000 Date: Wed, 30 Jul 2003 17:58:23 -0400 From: "Peter C. Lai" To: freebsd-net@freebsd.org Message-ID: <20030730215823.GA361@cowbert.2y.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4i Subject: dc TX underrun leads to delayed crash X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: peter.lai@uconn.edu List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 Jul 2003 21:58:29 -0000 I'm noticing on a moderately loaded system, that sometimes when the kernel increases the TX threshold (/kernel: dc0: TX underrun -- increasing TX threshold), a few minutes later, the system hardlocks requiring a reset. This routinely happens when I'm streaming MP3s over the network and the box suddenly hardlocks; after I go back to inspect the logs, the TX buffer underrun is the only thing in the log before the start of the kernel reboot messages. This is occuring on 4.8-STABLE as of July 7, 2003 on an AMD K6-2 500 with 348 Mb RAM and VIA Apollo MVP3 chipset. When the lockups occur, the system temperatures are below 40C, with little disk activity, moderate ram and cpu usage; the NIC (linksys LNE-100TX A) is usually doing a steady 50K/s at this point. -- Peter C. Lai University of Connecticut Dept. of Molecular and Cell Biology Yale University School of Medicine SenseLab | Research Assistant http://cowbert.2y.net/