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Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus

From: Avi Kivity
Subject: Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus
Date: Thu, 27 Aug 2009 10:57:26 +0300
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20090814 Fedora/3.0-2.6.b3.fc11 Lightning/1.0pre Thunderbird/3.0b3

On 08/27/2009 10:35 AM, Gerd Hoffmann wrote:
BTW: Seems linux doesn't use IRQ 5 even with lots of PCI devices,
instead it makes them share 10+11 ...

We could change the defaults to include 5, but maybe it makes more sense
to fix Linux to distribute active PCI IRQs across the resources it has
at its disposal.

i.e. Linux decides to stick with the defaults (starred) here ...

ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT]
ACPI: PCI Interrupt Link [LNKA] (IRQs 5 *10 11)
ACPI: PCI Interrupt Link [LNKB] (IRQs 5 *10 11)
ACPI: PCI Interrupt Link [LNKC] (IRQs 5 10 *11)
ACPI: PCI Interrupt Link [LNKD] (IRQs 5 10 *11)

... instead of trying to minimize IRQ sharing by using IRQ 5?

Yes. And if it turns out you have two active devices and 6 inactive devices, move the two active devices to private lines and pile up the inactive ones on the leftover.

They'll be slow regardless. I should be easy to support msi on e1000

What is needed on the guest side? Looks like even 2.6.30 doesn't use MSI for virtio-net ...

virtio msi support was merged in 2.6.31. For e1000, guest support is presumably there, just need to wire it into the device.

error compiling committee.c: too many arguments to function

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