Messages in this thread | | | Date | Fri, 20 May 2005 06:45:32 -0700 | From | Ashok Raj <> | Subject | Re: [patch 1/1] Proposed: Let's not waste precious IRQs... |
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Hi Natalie,
have you taken a look a the Vector Sharing Patch posted by Kaneshige for IA64?
Cheers, ashok
On Thu, May 19, 2005 at 04:06:13AM -0700, Natalie.Protasevich@unisys.com wrote: > > I suggest to change the way IRQs are handed out to PCI devices. > Currently, each I/O APIC pin gets associated with an IRQ, no matter if > the pin is used or not. It is expected that each pin can potentually > be engaged by a device inserted into the corresponding PCI slot. > However, this imposes severe limitation on systems that have designs > that employ many I/O APICs, only utilizing couple lines of each, such > as P64H2 chipset. It is used in ES7000, and currently, there is no way > to boot the system with more that 9 I/O APICs. The simple change below > allows to boot a system with say 64 (or more) I/O APICs, each > providing 1 slot, which otherwise impossible because of the IRQ gaps > created for unused lines on each I/O APIC. It does not resolve the > problem with number of devices that exceeds number of possible IRQs, > but eases up a tension for IRQs on any large system with potentually > large number of devices. I only implemented this for the ACPI boot, > since if the system is this big and >.. deleted... - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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