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

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Date:	Tue, 24 Nov 2009 10:59:29 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>, Len Brown <lenb@...nel.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dimitri Sivanich <sivanich@....com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	David Miller <davem@...emloft.net>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v6] x86/apic: limit irq affinity

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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