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Date: Thu, 29 Jan 2009 13:55:05 +0100
From: Ed Schouten <ed@80386.nl>
To: Andriy Gapon <avg@icyb.net.ua>
Message-ID: <20090129125505.GA17198@hoeg.nl>
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Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org>
Subject: Re: INTR_FILTER?
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* Andriy Gapon <avg@icyb.net.ua> wrote:
> INTR_FILTER - what does it do?
> It doesn't seem to be documented anywhere, but seems to affect interrupt
> code.

Not sure, but I think I was once told that FreeBSD has a `two level'
interrupt handling scheme, where the filter is invoked directly to only
figure out whether the interrupt is spurious or not. After it has been
determined it is not, an interrupt thread is scheduled to handle the
interrupt.

But as I said, I'm not sure. :-)

--=20
 Ed Schouten <ed@80386.nl>
 WWW: http://80386.nl/

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