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Date: Mon, 15 Nov 2004 22:15:40 -0800
From: "David G. Lawrence" <dg@dglawrence.com>
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Subject: Re: Deadlock problems with 'kill PID' on CURRENT
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> Okay, trying to see the purpose of this button ?
> 
> Why have an NMI button to break into DDB when you can just use CTRL-ALT-ESC ?

   NMI is "Non Maskable Interrupt", which means that it cannot be blocked
by the OS. Keyboard interrupts can be blocked (masked), and thus may not
work under some conditions - especially while the kernel is already
processing an interrupt.

-DG

David G. Lawrence
President
Download Technologies, Inc. - http://www.downloadtech.com - (866) 399 8500
TeraSolutions, Inc. - http://www.terasolutions.com - (888) 346 7175
The FreeBSD Project - http://www.freebsd.org
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