From owner-cvs-sys  Mon Mar 31 11:31:00 1997
Return-Path: <owner-cvs-sys>
Received: (from root@localhost)
          by freefall.freebsd.org (8.8.5/8.8.5) id LAA04852
          for cvs-sys-outgoing; Mon, 31 Mar 1997 11:31:00 -0800 (PST)
Received: from critter.dk.tfs.com (phk.cybercity.dk [195.8.133.247])
          by freefall.freebsd.org (8.8.5/8.8.5) with ESMTP id LAA04833;
          Mon, 31 Mar 1997 11:30:22 -0800 (PST)
Received: from critter (localhost [127.0.0.1])
	by critter.dk.tfs.com (8.8.5/8.8.5) with ESMTP id VAA27555;
	Mon, 31 Mar 1997 21:29:21 +0200 (CEST)
To: Nate Williams <nate@mt.sri.com>
cc: Poul-Henning Kamp <phk@freefall.freebsd.org>,
        CVS-committers@freefall.freebsd.org, cvs-all@freefall.freebsd.org,
        cvs-sys@freefall.freebsd.org
Subject: Re: cvs commit: src/sys/i386/apm apm.c apm_setup.h apm_setup.s src/sys/i386/conf GENERIC LINT src/sys/i386/include apm_bios.h 
In-reply-to: Your message of "Mon, 31 Mar 1997 10:02:36 PDT."
             <199703311702.KAA27958@rocky.mt.sri.com> 
Date: Mon, 31 Mar 1997 21:29:21 +0200
Message-ID: <27553.859836561@critter>
From: Poul-Henning Kamp <phk@critter.dk.tfs.com>
Sender: owner-cvs-sys@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

In message <199703311702.KAA27958@rocky.mt.sri.com>, Nate Williams writes:
>>   Modified:    sys/i386/apm  apm.c apm_setup.h apm_setup.s
>>                sys/i386/conf  GENERIC LINT
>>                sys/i386/include  apm_bios.h
>>   Log:
>>   Sanitize APM a bit.  Convert various #ifdef to id_flags instead.
>>   You may want to add "flags 0x31" to apm0 if you have a lousy
>>   implementation.  Read LINT.
>>   
>
>APM_IDLE_CPU still exists in swtch.s but is no longer documented.

Where it probably does less harm than it used to.

I don't think we have anybody who have documented that calling
apm_idle/busy was better than simply halting the CPU, right ?

I think that for the machines where apm_idle halts the CPU, we might
as well do it ourselves (unless we can document a saving in power of
course.

For the machines there merely slows the clock, it should be done on 
a basis of %idle_cpu on a ~10sec or more timescale.

--
Poul-Henning Kamp           | phk@FreeBSD.ORG       FreeBSD Core-team.
http://www.freebsd.org/~phk | phk@login.dknet.dk    Private mailbox.
whois: [PHK]                | phk@tfs.com           TRW Financial Systems, Inc.
Power and ignorance is a disgusting cocktail.