Re: [PATCH 0/3] Enable multiple MSI feature in pSeries

Benjamin Herrenschmidt
2013-05-22T00:16:13Z

On Tue, 2013-05-21 at 16:45 +0200, Alexander Gordeev wrote:
> On Tue, Jan 15, 2013 at 03:38:53PM +0800, Mike Qiu wrote:
> > The test results is shown by 'cat /proc/interrups':
> > CPU0 CPU1 CPU2 CPU3
> > 16: 240458 261601 226310 200425 XICS Level IPI
> > 17: 0 0 0 0 XICS Level RAS_EPOW
> > 18: 10 0 3 2 XICS Level hvc_console
> > 19: 122182 28481 28527 28864 XICS Level ibmvscsi
> > 20: 506 7388226 108 118 XICS Level eth0
> > 21: 6 5 5 5 XICS Level host1-0
> > 22: 817 814 816 813 XICS Level host1-1
>
> Hi Mike,
>
> I am curious if pSeries firmware allows changing affinity masks independently
> for multiple MSIs? I.e. in your example, would it be possible to assign IRQ21
> and IRQ22 to different CPUs?

Yes. Each interrupt has its own affinity, whether it's an MSI or not,
the affinity is not driven by the address.

Cheers,
Ben.

> Thanks!
>
> > LOC: 398077 316725 231882 203049 Local timer interrupts
> > SPU: 1659 919 961 903 Spurious interrupts
> > CNT: 0 0 0 0 Performance
> > monitoring interrupts
> > MCE: 0 0 0 0 Machine check exceptions
>