Date: Mon, 5 Nov 2001 21:32:21 +0100 From: Wilko Bulte <wkb@freebie.xs4all.nl> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Mike Silbersack <silby@silby.com>, "Matthew N. Dodd" <winter@jurai.net>, freebsd-scsi@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG, sos@FreeBSD.ORG Subject: Re: ahc(4) reports PCI parity error interrupt Message-ID: <20011105213221.B67746@freebie.xs4all.nl> In-Reply-To: <200111052007.fA5K78g50864@apollo.backplane.com>; from dillon@apollo.backplane.com on Mon, Nov 05, 2001 at 12:07:08PM -0800 References: <20011105131907.W29695-100000@achilles.silby.com> <200111052007.fA5K78g50864@apollo.backplane.com>
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On Mon, Nov 05, 2001 at 12:07:08PM -0800, Matthew Dillon wrote: > :... > :> I have not yet tried this yet. But I tried something else > :> (my EE genes made me try this): > :> > :> - I moved the Brooktree TV card from the slot furthest from the AGP > :> video card to the PCI slot closest to it. > :> > :> Interestingly enough this made all the PCI errors go away, I ran continous > :> buildworlds overnight, in parallel with continuous 'dd's of da0 and ad0, > :> in parallel with fxtv. > :> > :> All of this ran without a hitch. Interesting.. > :Hm... I was at a talk once where an HP EE mentioned that pci slots should > :be filled in order due to capacitance and timing issues. I didn't pay > :much attention to that, perhaps I should follow that layout in the future. > :I really don't like putting cards near the overly warm AGP video card > :though... oh well. > : > :Mike "Silby" Silbersack > > I'll bet what's really happening is that the brooktree TV card > is generating a lot of noise on the power busses, and moving it > simply moved it closer to larger caps on the motherboard or > perhaps better caps on the AGP card. Hmm. Interesting theory. Difficult to verify though. I did have this problem on 2 different mainboards, but that does not mean both boards could not have had the same power grid decoupling / bulk cap. issue of course. Well.. it works now. -- | / o / /_ _ email: wilko@FreeBSD.org |/|/ / / /( (_) Bulte Arnhem, The Netherlands To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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