From owner-freebsd-questions@FreeBSD.ORG Mon Jun 16 12:24:25 2008 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id CA7BE106566C for ; Mon, 16 Jun 2008 12:24:25 +0000 (UTC) (envelope-from wmoran@potentialtech.com) Received: from mail.potentialtech.com (internet.potentialtech.com [66.167.251.6]) by mx1.freebsd.org (Postfix) with ESMTP id 9E3C98FC19 for ; Mon, 16 Jun 2008 12:24:25 +0000 (UTC) (envelope-from wmoran@potentialtech.com) Received: from vanquish.ws.pitbpa0.priv.collaborativefusion.com (pr40.pitbpa0.pub.collaborativefusion.com [206.210.89.202]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.potentialtech.com (Postfix) with ESMTPSA id 126A7EBC0B; Mon, 16 Jun 2008 08:24:25 -0400 (EDT) Date: Mon, 16 Jun 2008 08:23:32 -0400 From: Bill Moran To: prad Message-Id: <20080616082332.02b87114.wmoran@potentialtech.com> In-Reply-To: <20080616001840.0d0e8fe9@gom.home> References: <20080616001840.0d0e8fe9@gom.home> X-Mailer: Sylpheed 2.4.8 (GTK+ 2.12.9; i386-portbld-freebsd7.0) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: "freebsd-questions@freebsd.org" Subject: Re: internet slowdown X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Jun 2008 12:24:25 -0000 In response to prad : > we have 2 freebsd7 servers using pf with static ip addresses through > our cable company (shaw cable) connecting our internal network to the > outside. the servers do websites, email and nameserve (bind94) > > sometimes one or both become sluggish letting us connect to websites. > the ping times become 10+ times as long. > pinging the servers from the outside also slows down. > > whenever we reboot the servers, everything is fine again for several > hours and then the speed starts fluctuating and then eventually > everything slows down again. (however the several hours is not certain > either because i just rebooted and everything slowed down after a few > minutes this time). > > i tried /etc/netstart and that speeded things up for a few pings only. > doing a systat shows the cpu to be idle more than 90% of the time. > we are presently trying to figure out netstat. > > we never experienced this issue with freebsd 6.3 which we ran for > several months. we've run freebsd7 since the beginning of june and this > problem seemed to start showing up within the first week. > > i am not sure where to look in order to solve this problem - > specifically which log files might provide some clues regarding the net. > > suggestions please? Is the console responsive when this happens? It doesn't sound like a CPU issue to me -- ICMP messages are low enough CPU overhead that the system would have to be pretty badly bogged for CPU starvation to cause problems. What do your network traffic graphs show during the slowdowns? Perhaps some sort of network flood occurring? -- Bill Moran http://www.potentialtech.com