From owner-freebsd-hackers Mon Nov 5 12:32:31 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from smtpzilla3.xs4all.nl (smtpzilla3.xs4all.nl [194.109.127.139]) by hub.freebsd.org (Postfix) with ESMTP id B6F4E37B416; Mon, 5 Nov 2001 12:32:25 -0800 (PST) Received: from freebie.xs4all.nl (freebie.xs4all.nl [213.84.32.253]) by smtpzilla3.xs4all.nl (8.12.0/8.12.0) with ESMTP id fA5KWL9t089197; Mon, 5 Nov 2001 21:32:21 +0100 (CET) Received: (from wkb@localhost) by freebie.xs4all.nl (8.11.6/8.11.6) id fA5KWLv67812; Mon, 5 Nov 2001 21:32:21 +0100 (CET) (envelope-from wkb) Date: Mon, 5 Nov 2001 21:32:21 +0100 From: Wilko Bulte To: Matthew Dillon Cc: Mike Silbersack , "Matthew N. Dodd" , 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> References: <20011105131907.W29695-100000@achilles.silby.com> <200111052007.fA5K78g50864@apollo.backplane.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <200111052007.fA5K78g50864@apollo.backplane.com>; from dillon@apollo.backplane.com on Mon, Nov 05, 2001 at 12:07:08PM -0800 X-OS: FreeBSD 4.4-STABLE X-PGP: finger wilko@freebsd.org Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG 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