From owner-freebsd-stable@FreeBSD.ORG Sat Feb 18 21:04:31 2006 Return-Path: X-Original-To: freebsd-stable@freebsd.org Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 34D4916A420 for ; Sat, 18 Feb 2006 21:04:31 +0000 (GMT) (envelope-from dan@dan.emsphone.com) Received: from dan.emsphone.com (dan.emsphone.com [199.67.51.101]) by mx1.FreeBSD.org (Postfix) with ESMTP id CC5A143D45 for ; Sat, 18 Feb 2006 21:04:30 +0000 (GMT) (envelope-from dan@dan.emsphone.com) Received: (from dan@localhost) by dan.emsphone.com (8.13.1/8.13.4) id k1IL4RP7091383; Sat, 18 Feb 2006 15:04:27 -0600 (CST) (envelope-from dan) Date: Sat, 18 Feb 2006 15:04:27 -0600 From: Dan Nelson To: Wolfgang Zenker Message-ID: <20060218210427.GG52817@dan.emsphone.com> References: <1140292322.11473.10.camel@honker.internal.dcrosstech.com> <200602182011.k1IKBB7a079573@saturn.lyxys.ka.sub.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200602182011.k1IKBB7a079573@saturn.lyxys.ka.sub.org> X-OS: FreeBSD 5.4-STABLE X-message-flag: Outlook Error User-Agent: Mutt/1.5.11 Cc: freebsd-stable@freebsd.org Subject: Re: high interrupt load under 6.0? 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, 18 Feb 2006 21:04:31 -0000 In the last episode (Feb 18), Wolfgang Zenker said: > > I have a 486DX50 firewall that has been serving me well for a > > number of years. I recently upgraded it fro 5.4 to 6.0 and > > performance plumeted rather drastically (about 40%). I would like > > to fix it. What I have noticed is that even when sitting idle the > > system spends ~20% of its time in interrupt. Below I have included > > dmesg, kernel config, and vmstat -i information. > > [..] > > interrupt total rate > > irq0: clk 203894894 1000 > > a clock rate of 1000 Hz is probably to high for a 486 class cpu. You > should add "options HZ=100" to your kernel config to get back to the > 100 Hz that where default before 6.0 Or add kern.hz="100" to your /boot/loader.conf if you don't want to rebuild your kernel. -- Dan Nelson dnelson@allantgroup.com