Messages in this thread | | | Date | Wed, 31 Jan 2007 10:27:44 -0500 | From | Jeff Garzik <> | Subject | Re: Linux 2.6.20-rc6 - sky2 resume breakage |
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Ingo Molnar wrote: > * Jeff Garzik <jeff@garzik.org> 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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