From owner-freebsd-questions@FreeBSD.ORG Mon Jul 2 12:04:57 2007 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 75D3016A46C for ; Mon, 2 Jul 2007 12:04:57 +0000 (UTC) (envelope-from cpghost@cordula.ws) Received: from fw.farid-hajji.net (fw.farid-hajji.net [213.146.115.42]) by mx1.freebsd.org (Postfix) with ESMTP id 1327113C43E for ; Mon, 2 Jul 2007 12:04:57 +0000 (UTC) (envelope-from cpghost@cordula.ws) Received: from epia-2.farid-hajji.net (epia-2 [192.168.254.11]) by fw.farid-hajji.net (Postfix) with ESMTP id 338C1DFA7B; Mon, 2 Jul 2007 14:05:00 +0200 (CEST) Message-ID: <4688EA5D.5010905@cordula.ws> Date: Mon, 02 Jul 2007 14:06:53 +0200 From: cpghost User-Agent: Thunderbird 2.0.0.4 (X11/20070616) MIME-Version: 1.0 To: Chuck Swiger References: <46878C1C.9040907@cordula.ws> <4687B02B.7080106@mac.com> In-Reply-To: <4687B02B.7080106@mac.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: questions Subject: Re: kern.hz="100" stops high-pitched whine 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, 02 Jul 2007 12:04:57 -0000 Chuck Swiger wrote: > cpghost wrote: >> Are there any reasons NOT changing kern.hz from the >> default 1000 back to 100? With my typical mix of >> desktop apps (EPIA) and networking / server (Soekris), >> everything seems to be running just as smoothly with >> 100 Hz than with 1000 Hz (testing now for two weeks >> without problems). Even playing videos with mplayer >> on the EPIA doesn't look different in any way. >> >> Is it okay to stay with 100 Hz with this type of >> low-speed CPU/boards? Or are there some compelling >> reasons not to? > > Actually, many Unix systems ran with HZ=100 until a few years ago, > about when Gb ethernet and CPUs became common. A slower machine like > the EPIA boxes do quite well with HZ=100/200/250 or so...HZ=1000 is > better if you have a fast box running lots of concurrent processes, > and/or are proxying or routing network traffic where the difference > between 10 ms and 1ms of latency adds up and/or effects other systems. > Ah, thank you! It definitely works very well here with HZ=100. :) Regards, -cpghost. -- Cordula's Web. http://www.cordula.ws/