From owner-freebsd-net@FreeBSD.ORG Thu Oct 21 14:56:56 2004 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 9FF3216A4CE for ; Thu, 21 Oct 2004 14:56:56 +0000 (GMT) Received: from mailhost.nmt.edu (mailhost.nmt.edu [129.138.4.52]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4A79F43D31 for ; Thu, 21 Oct 2004 14:56:56 +0000 (GMT) (envelope-from wcolburn@nmt.edu) Received: from icewing.nmt.edu (icewing.nmt.edu [129.138.4.102]) by mailhost.nmt.edu (8.13.0/8.13.0) with ESMTP id i9LEusfj020837 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 21 Oct 2004 08:56:55 -0600 Received: from icewing.nmt.edu (localhost [127.0.0.1]) by icewing.nmt.edu (8.12.8/8.12.8) with ESMTP id i9LEusMG019688 for ; Thu, 21 Oct 2004 08:56:54 -0600 Received: (from wcolburn@localhost) by icewing.nmt.edu (8.12.8/8.12.8/Submit) id i9LEusnH019686 for freebsd-net@freebsd.org; Thu, 21 Oct 2004 08:56:54 -0600 Date: Thu, 21 Oct 2004 08:56:54 -0600 From: "William D. Colburn (aka Schlake)" To: freebsd-net@freebsd.org Message-ID: <20041021145654.GA19657@nmt.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.2.1i Subject: 9 second ping lag unless I run tcpdump on RELENG_5 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Oct 2004 14:56:56 -0000 I have a RELENG_5 box on my desk. Unless I run the tcpdump program, it responds progressively slower on the network. This seemed like the most appropriate list to post this question too. This morning, for instance, it had a 9 second ping response time from a machine on the same network segment as it when I came into work. As soon as I typed 'tcpdump' on the freebsd box the ping time dropped to nearly instantaneous. I killed tcpdump and let it run for a while. About a thousand seconds later it suddenly jumped to 1 second, then to 2 seconds. As soon as I ran tcpdump again it dropped back to normal. The uname ids it as 5.3-STABLE #14: Wed Oct 20 10:23:11 UTC 2004, with a GENERIC kernel. I did a new cvsup (along with a tcpdump because otherwise cvsup fails) this morning and nothing new came across. -- William Colburn, "Sysprog" Computer Center, New Mexico Institute of Mining and Technology http://www.nmt.edu/tcc/ http://www.nmt.edu/~wcolburn