Date: Fri, 29 Sep 2000 07:35:10 +0000 (GMT) From: Terry Lambert <tlambert@primenet.com> To: res03db2@gte.net (Robert Clark) Cc: res03db2@gte.net, tlambert@primenet.com, dot@dotat.at, freebsd-chat@FreeBSD.ORG, ragnar@sysabend.org Subject: Re: Ideas about network interfaces. Message-ID: <200009290735.AAA13895@usr08.primenet.com> In-Reply-To: <200009290716.AAA01416@gte.net> from "Robert Clark" at Sep 29, 2000 12:16:13 AM
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> So would this PCI style of hardware pathing travel anywhere the PCI > bus goes? Yes. > Its funny to see the PCI bus go so many places. I saw several > books today on PCI. I may have to see if I can find an approachable > one. The "MindShare" one is pretty good, IMO. > Why couldn't we just have one or more unique interrupts per slot, like > on the apple II. Because PCI doesn't cascade interrupts on all motherboards, there's an interrupt wrap on slot 5, if there's a slot 5, and some boards use more than one interrupt, which would make the second device share the interrupt with the card in the next adjacent slot (in the case of a cascade), or the first device share with the previous adjacent slot (in the case of a non-cascade). Historically, Intel motherboards did not cacade (A/B/C/D for slot one, B/C/D/A for slot two, etc.) unless they were from their "Server Products Group". Of course, the only group that makes good motherboards at Intel is the SPG, and the only groups you can buy motherboards from _aren't_ the SPG... Suffice it to say, you can't just decide that you aren't going to share, so long as card and motherboard designers are still going insane from the arsenic they use to block their hats, and can't agree with each other between all vendors. NB: You'd think a "greedy" card that wanted more than one PCI interrupt would try to sneak a peek around, and try not to share an interrupt with another card, so that the vendors products at least appeared faster than their competition wo didn't peek around... Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message
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