To: Dimitri Sivanich <sivanich@sgi.com>
Cc: Ingo Molnar <mingo@elte.hu>, Suresh Siddha <suresh.b.siddha@intel.com>,
       Yinghai Lu <yinghai@kernel.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6] x86/apic: limit irq affinity
References: <20091120211139.GB19106@sgi.com>
From: ebiederm@xmission.com (Eric W. Biederman)
Date: Sat, 21 Nov 2009 10:49:50 -0800
In-Reply-To: <20091120211139.GB19106@sgi.com> (Dimitri Sivanich's message of "Fri\, 20 Nov 2009 15\:11\:39 -0600")
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Dimitri Sivanich <sivanich@sgi.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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