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

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Date:	Wed, 22 May 2013 10:15:13 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Alexander Gordeev <agordeev@...hat.com>
Cc:	Mike Qiu <qiudayu@...ux.vnet.ibm.com>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	tglx@...utronix.de
Subject: Re: [PATCH 0/3] Enable multiple MSI feature in pSeries

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
> 


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