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

From: Jiri Kosina
Date: Mon Mar 18 2013 - 18:05:14 EST

On Mon, 18 Mar 2013, Yinghai Lu wrote:

> > 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.

Jiri Kosina
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