From owner-cvs-all@FreeBSD.ORG Mon Nov 8 19:19:06 2004 Return-Path: Delivered-To: cvs-all@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 1C9C116A4CE; Mon, 8 Nov 2004 19:19:06 +0000 (GMT) Received: from postal3.es.net (postal3.es.net [198.128.3.207]) by mx1.FreeBSD.org (Postfix) with ESMTP id DAA6A43D49; Mon, 8 Nov 2004 19:19:05 +0000 (GMT) (envelope-from oberman@es.net) Received: from ptavv.es.net ([198.128.4.29]) by postal3.es.net (Postal Node 3) with ESMTP id IBA74465; Mon, 08 Nov 2004 11:19:05 -0800 Received: from ptavv (localhost [127.0.0.1]) by ptavv.es.net (Tachyon Server) with ESMTP id 4D47B5D04; Mon, 8 Nov 2004 11:19:05 -0800 (PST) To: Paul Richards In-reply-to: Your message of "Mon, 08 Nov 2004 18:50:33 GMT." <20041108185033.GB34058@myrddin.originative.co.uk> Date: Mon, 08 Nov 2004 11:19:05 -0800 From: "Kevin Oberman" Message-Id: <20041108191905.4D47B5D04@ptavv.es.net> cc: src-committers@freebsd.org cc: cvs-src@freebsd.org cc: Kris Kennaway cc: cvs-all@freebsd.org cc: Poul-Henning Kamp cc: Nate Lawson cc: Max Laier Subject: Re: cvs commit: src/sys/kern subr_param.c X-BeenThere: cvs-all@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: CVS commit messages for the entire tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 Nov 2004 19:19:06 -0000 > Date: Mon, 8 Nov 2004 18:50:33 +0000 > From: Paul Richards > Sender: owner-cvs-all@freebsd.org > > On Sat, Nov 06, 2004 at 04:03:12PM -0800, Kris Kennaway wrote: > > On Sat, Nov 06, 2004 at 03:50:06PM -0800, Nate Lawson wrote: > > > > > I was traveling out of the country so I didn't get a chance to comment. > > > The two caveats I'm aware of is a slight loss in processes that are > > > CPU bound and an audio hum from ACPI CPU idling. The latter is rather > > > interesting actually. At hz=100, it's just a quiet low buzz but at > > > 1000, it is readily audible on many laptops and annoying. Windows uses > > > hz=1000 too and has the same problem. I believe it's related to the > > > capacitors and other devices charging/discharging when clocks are stopped. > > > > Can we play music by modulating the value of hz? :) > > I remember some code for the Commodore Pets that you could use to play > notes on a nearby radio by tweaking some spinning loops. Quite a neat > trick at the time since there wasn't any sound hardware. Actually, this technique predates the PET by any years. I know that we could play music on the PDP-1 and that goes back to the late '05s or early 60's. I did it on my PDP-11 in the early '70s. I also heard a CDC MASStore tape system played as an organ by adjusting the tape movement in the vacuum columns. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634