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Date:      Wed, 12 Feb 2003 18:10:04 +0100 (CET)
From:      Oliver Fromme <olli@secnetix.de>
To:        freebsd-stable@FreeBSD.ORG
Subject:   Re: PCI oddity
Message-ID:  <200302121710.h1CHA465038386@lurza.secnetix.de>
In-Reply-To: <3E4A6FFE.409@mitre.org>

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Jason Andresen <jandrese@mitre.org> wrote:
 > Bill Moran wrote:
 >> Jason Andresen wrote:
 >>> I'm still curious if this is a problem with FreeBSD, with my 
 >>> motherboard, or with the Cards themselves.  Is it unusual for a card 
 >>> to share nicely?  Not one manual for any of my cards even mentions IRQ 
 >>> sharing.
 >> 
 >> 
 >> Then they probably don't.  IRQ sharing is one of those things that cards
 >> usually brag about if they support.
 >> 
 >> If you have non-sharing cards trying to use a shared interrupt, it won't
 >> work.  Crashes don't surprise me under these circumstances.
 > 
 > What would I be looking for on the box/datasheet/whitepaper to find if a 
 > card supports sharing?

Interrupt-sharing is a standard PCI feature.  If a card
claims PCI conformance, it must support interrupt sharing.
If it doesn't support it, I'd consider it broken (either
the card or the mainboard).

I've seen interrupt sharing a lot on various machines,
and never had any problems so far.

Regards
   Oliver

-- 
Oliver Fromme, secnetix GmbH & Co KG, Oettingenstr. 2, 80538 München
Any opinions expressed in this message may be personal to the author
and may not necessarily reflect the opinions of secnetix in any way.

"All that we see or seem is just a dream within a dream" (E. A. Poe)

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