Ingo Molnar wrote:
* Jeff Garzik <[email protected]> wrote:
Easy to name an example, as they are pretty generic. When sharing
irqs -- usually ATA is configured to PCI native (IO-APIC-fasteoi) --
any interrupt storm causes the other devices sharing that irq to crap
themselves (kernel turns off irq, suggests irqpoll, etc.)
ok. Can you suggest any way for me to reproduce such a bug artificially
on a test system? [i have both old and new systems, so if you can think
of a way for me to trigger this i'd be happy to try]
Should be pretty easy. With either the old-IDE driver or libata,
complete a command without acknowledging an interrupt. For libata, that
means poking around in ata_host_intr() and avoiding well-built hardware
like AHCI. Anything that uses ata_piix driver, basically all Intel
machines, should be applicable in the "not well built" category... :)
Jeff
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