linux-kernel - Re: [PATCH v6] x86/apic: limit irq affinity

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Date:	Sat, 21 Nov 2009 10:49:50 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Dimitri Sivanich <sivanich@....com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Yinghai Lu <yinghai@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6] x86/apic: limit irq affinity

Dimitri Sivanich <sivanich@....com> writes:

> This patch allows for hard numa restrictions to irq affinity on x86 systems.
>
> Affinity is masked to allow only those cpus which the subarchitecture
> deems accessible by the given irq.
>
> On some UV systems, this domain will be limited to the nodes accessible
> to the irq's node.  Initially other X86 systems will not mask off any cpus
> so non-UV systems will remain unaffected.

Is this a hardware restriction you are trying to model?
If not this seems wrong.

Eric
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