Date: Wed, 05 Aug 1998 21:09:43 -0500 From: David Kelly <dkelly@hiwaay.net> To: freebsd-hardware@FreeBSD.ORG Subject: Re: PCI and de0 Message-ID: <199808060209.VAA17774@nospam.hiwaay.net> In-Reply-To: Message from Mike Smith <mike@smith.net.au> of "Sun, 02 Aug 1998 21:09:05 PDT." <199808030409.VAA11264@antipodes.cdrom.com>
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Mike Smith writes: > > It did it all by itself. And I was asking how to control it. Not > > knowing how to change the 21040 IRQ, I changed the Adaptec: > > Some BIOS setup utilities allow you to determine the IRQ assignment on > a per-slot basis. Some allow you to control the pool from which PCI > IRQs are assigned. Modern BIOSses allow you to nominate IRQs which > will be routed for use by legacy (ISA) hardware. > > This is all "PC Tech 101" material. As screwball PC BIOS's are its at least a 300 level course. :-) I recal the BIOS has a pool of IRQ's but I don't believe I can reserve any one in particular. Especially can't reserve by slot. The only option would be to put the Adaptec hardwired IRQ on the bottom of the assignment list. Local hamfest in 10 days. Might decide to solve the problem once and for all there. > > Will look for PnP. Will try selecting "BIOS Defaults" too as others > > have suggested. Won't be near that machine again until Thursday. > > Meanwhile it continues to run off the ISA NE2000. > > For the class of machine in question, this is probably not such a bad > thing to be doing. It's doubtful whether the 'de' card will improve > your performance noticeably, depending on the PCI/VLB architecture of > the system. > > You might also have the 'de' card in a slave-only PCI slot, where it's > not going to work properly. Card was functioning a year or so ago in this system. Card has never been removed from the slot it used to work in. Only change was an attempt to add a VL-bus Adaptec card in addition to the de0 and a PCI Adaptec 2940. The de0 was measurably better than the NE2000. The de0 could hold its own with the SGI and Sun workstations on the net, while the NE2000 thruput may be limited by the amount of CPU it uses. -- David Kelly N4HHE, dkelly@nospam.hiwaay.net ===================================================================== The human mind ordinarily operates at only ten percent of its capacity -- the rest is overhead for the operating system. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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