Re: [3.9-rc1] irq 16: nobody cared (was [3.9-rc1] very poor interrupt responses)

On Mon, 18 Mar 2013, Yinghai Lu wrote:

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Yes, switching from MSI to IO-APIC-fasteoi makes the report about lost interrupts go away.

My understanding from the other mail is that DAniel Vetter already has an idea what might be going wrong with IRQ acking on GM45 chipsets; hopefully this datapoint regarding MSI will fit into it.

What is /proc/interrupts difference between with and without pci=nomsi ?

drm is forced to share irq 16?

Yup, IRQ 16 is being shared, and one of the owners is i915.