Date: Wed, 12 Feb 2003 12:07:45 -0500 From: Bill Moran <wmoran@potentialtech.com> To: Jason Andresen <jandrese@mitre.org> Cc: Steven <magusbaal@digitalbastards.net>, freebsd-stable@freebsd.org Subject: Re: PCI oddity Message-ID: <3E4A7F61.3040302@potentialtech.com> References: <002001c2d186$302725d0$3802a8c0@internal.digitalbastards.net> <3E491EC7.3020300@mitre.org> <3E4924AC.4010203@potentialtech.com> <3E4A6FFE.409@mitre.org>
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Jason Andresen 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? Is there an acronym? Looking at the Intel Pro > 100+ (which IIRC someone claimed supported sharing) on Intel's site > (http://www.intel.com/network/connectivity/products/pro100_dsktop.htm) > nothing really stands out and says "I support sharing". The only thing > I see that even looks remotely interesting is the claim that it supports > INTA, which seems a little odd since AFAIK the 4 regular PCI interrupts > are INTA-INTD, so this looks like it's claiming to suppport interrupts. OK, you got me here. I was apparently speaking without knowing what I was saying when I said "cards usually brag about if they support". I know factually that those card support interrupt sharing, because I've used them in that way. Yet I didn't see anything on the spec sheet to indicate that. So, in light of this, I don't really know how to tell if a card supports interrupt sharing or not. I do remember a machine where we couldn't get it working right using the bottom 2 pci slots because they were sharing an interrupt and the card didn't support interrupt sharing. In this case, we had a spare slot and we just rearranged the cards and everything worked fine. -- Bill Moran Potential Technologies http://www.potentialtech.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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