linux-kernel - Re: [PATCH 2/2] x2apic, cluster: use all the members of one cluster specified in the smp_affinity mask for the interrupt desintation

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Date:	Tue, 22 May 2012 11:34:27 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>, agordeev@...hat.com,
	yinghai@...nel.org, linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH 2/2] x2apic, cluster: use all the members of one cluster
 specified in the smp_affinity mask for the interrupt desintation

On Tue, May 22, 2012 at 09:04:29AM +0200, Ingo Molnar wrote:
> 
> * Suresh Siddha <suresh.b.siddha@...el.com> wrote:
> 
> > If the HW implements round-robin interrupt delivery, this 
> > enables multiple cpu's (which are part of the user specified 
> > interrupt smp_affinity mask and belong to the same x2apic 
> > cluster) to service the interrupt.
> 
> Could/should we do something similar for regular APICs as well? 
> They too support masks and LowestPrio delivery - and doing that 
> will increase test coverage rather significantly.

It seems only es7000_cpu_mask_to_apicid could be tuned up
to produce per-cluster mask instead of yielding bad-apic?

	Cyrill
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