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| From: | Gerd Hoffmann |
| Subject: | Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus |
| Date: | Thu, 27 Aug 2009 09:35:57 +0200 |
| User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.1) Gecko/20090814 Fedora/3.0-2.6.b3.fc11 Lightning/1.0pre Thunderbird/3.0b3 |
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?
They'll be slow regardless. I should be easy to support msi on e1000 though.
What is needed on the guest side? Looks like even 2.6.30 doesn't use MSI for virtio-net ...
cheers, Gerd
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