From owner-freebsd-questions@FreeBSD.ORG Mon Apr 4 23:09:10 2005 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id C886716A4CE for ; Mon, 4 Apr 2005 23:09:10 +0000 (GMT) Received: from skipjack.no-such-agency.net (skipjack.no-such-agency.net [64.142.114.146]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7847743D48 for ; Mon, 4 Apr 2005 23:09:10 +0000 (GMT) (envelope-from jpp@cloudview.com) Received: from skipjack.no-such-agency.net (localhost [127.0.0.1]) by skipjack.no-such-agency.net (Postfix) with ESMTP id 29A2A34DA11; Mon, 4 Apr 2005 16:09:10 -0700 (PDT) Received: from [192.168.2.120] (blackhole.no-such-agency.net [64.142.103.196]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by skipjack.no-such-agency.net (Postfix) with ESMTP id E195534DA0F; Mon, 4 Apr 2005 16:09:09 -0700 (PDT) Message-ID: <4251C915.1000009@cloudview.com> Date: Mon, 04 Apr 2005 16:09:09 -0700 From: John Pettitt User-Agent: Mozilla Thunderbird 1.0 (Windows/20041206) X-Accept-Language: en-us, en MIME-Version: 1.0 To: cpghost@cordula.ws References: <20050404091719.GA9748@lothlorien.nagual.st> <20050404093755.GA48928@epia2.farid-hajji.net> In-Reply-To: <20050404093755.GA48928@epia2.farid-hajji.net> X-Enigmail-Version: 0.90.1.1 X-Enigmail-Supports: pgp-inline, pgp-mime X-AV-Checked: by skipjack Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Content-Filtered-By: Mailman/MimeDel 2.1.1 cc: freebsd-questions Subject: Re: HZ=1000 ? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 Apr 2005 23:09:10 -0000 cpghost@cordula.ws wrote: > >Interestingly, HZ=100 has remained constant for decades (!), despite >CPUs getting faster all the time. This is an excellent value for most >typical usage patterns. Cranking it up should only be required for >special cases. Anyway, the HZ knob is there. Experiment with it until >you get optimal performance. > > > > > > In the dim and distant past (like 1983) some systems used HZ=50 or HZ=60 depending on where in the world they were. I used an MP/M based box that took it's clock tick from the power line (no good RTC hardware available but the power company keeps pretty good time). John