linux-kernel - Re: Question: How to distribute the interrupts over multiple cores?

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Message-ID: <51501BB6.5000306@cn.fujitsu.com>
Date:	Mon, 25 Mar 2013 17:41:10 +0800
From:	Lin Feng <linfeng@...fujitsu.com>
To:	Lenky Gao <lenky.gao@...il.com>
CC:	linux-kernel@...r.kernel.org, yinghai@...nel.org, mingo@...e.hu,
	gorcunov@...il.com, rusty@...tcorp.com.au, sivanich@....com,
	agordeev@...hat.com
Subject: Re: Question: How to distribute the interrupts over multiple cores?

Hi,

On 03/25/2013 05:00 PM, Lenky Gao wrote:
> I have found a comment in function physflat_cpu_mask_to_apicid to explain why.
> 
> static unsigned int physflat_cpu_mask_to_apicid(const struct cpumask *cpumask)
> {
> 	int cpu;
> 
> 	/*
> 	 * We're using fixed IRQ delivery, can only return one phys APIC ID.
> 	 * May as well be the first.
> 	 */
> ...
> 
> This is mean i can not distribute the interrupts over multiple cores
> when the machine have more than 8 cores?
> 
> 
Sorry I can't find physflat_cpu_mask_to_apicid() in latest Linux tree, seems it has
been removed out.. But just consider what you said that it's limited by "8 cores"
IMHO it's impossible or it is a bug.

thanks,
linfeng
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