From owner-freebsd-questions@FreeBSD.ORG Mon Jul 2 12:43:50 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 CB2EC16A421 for ; Mon, 2 Jul 2007 12:43:50 +0000 (UTC) (envelope-from antennex@hotmail.com) Received: from bay0-omc3-s21.bay0.hotmail.com (bay0-omc3-s21.bay0.hotmail.com [65.54.246.221]) by mx1.freebsd.org (Postfix) with ESMTP id B770013C469 for ; Mon, 2 Jul 2007 12:43:50 +0000 (UTC) (envelope-from antennex@hotmail.com) Received: from hotmail.com ([65.55.130.110]) by bay0-omc3-s21.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.2668); Mon, 2 Jul 2007 05:31:51 -0700 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Mon, 2 Jul 2007 05:31:51 -0700 Message-ID: Received: from 65.55.130.123 by by125fd.bay125.hotmail.msn.com with HTTP; Mon, 02 Jul 2007 12:31:47 GMT X-Originating-IP: [65.68.247.73] X-Originating-Email: [antennex@hotmail.com] X-Sender: antennex@hotmail.com In-Reply-To: <4687B02B.7080106@mac.com> From: "Jack Stone" To: freebsd-questions@freebsd.org Date: Mon, 02 Jul 2007 07:31:47 -0500 Mime-Version: 1.0 Content-Type: text/plain; format=flowed X-OriginalArrivalTime: 02 Jul 2007 12:31:51.0423 (UTC) FILETIME=[F75F60F0:01C7BCA4] 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 12:43:50 -0000 >From: Chuck Swiger >To: cpghost >CC: questions >Subject: Re: kern.hz="100" stops high-pitched whine >Date: Sun, 01 Jul 2007 09:46:19 -0400 > >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. > >-- >-Chuck A while ago, I noticed someone's kernel config that included: hertz=2000 which made me wonder where this setting info comes from? I've been using hertz=1000 however, with my much faster boxes, is this appropriate now? Thanks, Jack _________________________________________________________________ PC Magazine’s 2007 editors’ choice for best Web mail—award-winning Windows Live Hotmail. http://imagine-windowslive.com/hotmail/?locale=en-us&ocid=TXT_TAGHM_migration_HM_mini_pcmag_0507