Message-ID: <4B0C2D11.80008@kernel.org>
Date: Tue, 24 Nov 2009 10:59:29 -0800
From: Yinghai Lu <yinghai@kernel.org>
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To: Peter Zijlstra <peterz@infradead.org>, Len Brown <lenb@kernel.org>
CC: Ingo Molnar <mingo@elte.hu>, "Eric W. Biederman" <ebiederm@xmission.com>,
       Arjan van de Ven <arjan@infradead.org>,
       Thomas Gleixner <tglx@linutronix.de>,
       Dimitri Sivanich <sivanich@sgi.com>,
       Suresh Siddha <suresh.b.siddha@intel.com>,
       LKML <linux-kernel@vger.kernel.org>,
       Jesse Barnes <jbarnes@virtuousgeek.org>,
       David Miller <davem@davemloft.net>,
       Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>,
       "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH v6] x86/apic: limit irq affinity
References: <20091120211139.GB19106@sgi.com>	 <m1r5rrr9v5.fsf@fess.ebiederm.org> <20091122011457.GA16910@sgi.com>	 <alpine.LFD.2.00.0911241246470.24119@localhost.localdomain>	 <1259069986.4531.1453.camel@laptop>	 <alpine.LFD.2.00.0911241443110.24119@localhost.localdomain>	 <20091124065022.6933be1a@infradead.org> <m1ws1f6csh.fsf@fess.ebiederm.org>	 <20091124182059.GB11894@elte.hu>  <4B0C259A.5020303@kernel.org> <1259087563.4531.1776.camel@laptop>
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Peter Zijlstra wrote:
> On Tue, 2009-11-24 at 10:27 -0800, Yinghai Lu wrote:
> 
>> we already have dev numa node, so could just make irqblance to some smart to use
>> that device node corresponding for irq that is binding to the device.
> 
> The argument is that a single device can have multiple IRQs and
> therefore numa nodes.

one node could have 8 cores or 16 threads, so should be right.

other case the intel new 4 sockets system will have two IOHs, and one for socket0 and socket 1
and one for socket2 and socet3

acpi root bus _PXM only can return one.
so wonder if ACPI spec need to be extended to support two nodes there.

after that, we need to extend numa_node to support that.

YH
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