From owner-freebsd-stable@FreeBSD.ORG Sat Jan 13 09:42:06 2007 Return-Path: X-Original-To: freebsd-stable@freebsd.org Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id D5E6616A4B3 for ; Sat, 13 Jan 2007 09:42:06 +0000 (UTC) (envelope-from kkowalik@uci.agh.edu.pl) Received: from galaxy.agh.edu.pl (galaxy.agh.edu.pl [149.156.96.9]) by mx1.freebsd.org (Postfix) with ESMTP id 9C47813C448 for ; Sat, 13 Jan 2007 09:42:06 +0000 (UTC) (envelope-from kkowalik@uci.agh.edu.pl) Received: by galaxy.agh.edu.pl (Postfix, from userid 1001) id 23DF1FAD; Sat, 13 Jan 2007 10:42:05 +0100 (CET) Date: Sat, 13 Jan 2007 10:42:05 +0100 From: Krzysztof Kowalik To: freebsd-stable@freebsd.org Message-ID: <20070113094205.GA27560@uci.agh.edu.pl> References: <20070107155229.GA4749@uci.agh.edu.pl> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070107155229.GA4749@uci.agh.edu.pl> Cc: kris@obsecurity.org Subject: Re: fxp(4) and lockups on RELENG_6_x X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 13 Jan 2007 09:42:06 -0000 Krzysztof Kowalik wrote: > We are running an (IRC) server that under high-rate traffic (ie. DDoS > attack) stops to respond to the network. The network remains locked up > even after the original attack stops. [...] And it turns out to be an usual PEBKAC. The system was running out of mbuf clusters, and after increasing kern.ipc.nmbclusters to a sane value things started to work as expected again. Since it's usually the first thing one changes on such a box, we didn't even think of checking it. Sorry for the noise. -- () ASCII Ribbon Campaign /\ Support plain text e-mail