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Date: Mon, 8 Nov 2004 18:50:33 +0000
From: Paul Richards <paul@originative.co.uk>
To: Kris Kennaway <kris@obsecurity.org>
Message-ID: <20041108185033.GB34058@myrddin.originative.co.uk>
References: <200411061133.iA6BXhHT086940@repoman.freebsd.org>
	<20041106163748.GB38881@ip.net.ua> <200411061859.56624.max@love2party.net>
	<418D632E.2020402@root.org> <20041107000311.GA42221@xor.obsecurity.org>
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cc: Poul-Henning Kamp <phk@freebsd.org>
cc: Nate Lawson <nate@root.org>
cc: Max Laier <max@love2party.net>
Subject: Re: cvs commit: src/sys/kern subr_param.c
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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.

Paul.