From owner-freebsd-current  Wed Sep  1  6:55: 5 1999
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To: Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
Cc: Mike Smith <mike@smith.net.au>, Warner Losh <imp@village.org>,
	nate@mt.sri.com (Nate Williams),
	Mitsuru IWASAKI <iwasaki@jp.FreeBSD.org>, mmuir@es.co.nz,
	freebsd-current@FreeBSD.ORG
Subject: Re: followup to apm problems. 
In-reply-to: Your message of "Wed, 01 Sep 1999 09:45:38 EDT."
             <199909011345.JAA05781@khavrinen.lcs.mit.edu> 
Date: Wed, 01 Sep 1999 15:51:11 +0200
Message-ID: <35950.936193871@critter.freebsd.dk>
From: Poul-Henning Kamp <phk@critter.freebsd.dk>
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In message <199909011345.JAA05781@khavrinen.lcs.mit.edu>, Garrett Wollman writes:
><<On Tue, 31 Aug 1999 15:16:48 -0700, Mike Smith <mike@smith.net.au> said:
>
>> Actually, that's almost entirely system-dependant.  The BIOS may well 
>> poll the keyboard controller/USB controller, for example.
>
>And designs based on the Intel PIIX4 will generate SMI# interrupts for
>whichever activities are programmed in the BIOS, completely bypassing
>the traditional interrupt mechanism.

And these interrupts will take as much as 50usec to service...

--
Poul-Henning Kamp             FreeBSD coreteam member
phk@FreeBSD.ORG               "Real hackers run -current on their laptop."
FreeBSD -- It will take a long time before progress goes too far!


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