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

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Message-ID: <514FF70A.6080402@cn.fujitsu.com>
Date:	Mon, 25 Mar 2013 15:04:42 +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?



On 03/25/2013 02:46 PM, Lenky Gao wrote:
>> Do you mean on your old machine the irq will be distributed automatically
>> among the cpus set by smp_affinity?
>>
> 
> Yes. My another machine's interrupts are as follows:
And without irqbalance service? It sounds weird to me..

thanks,
linfeng

> 
> [root@...alhost ~]# cat /proc/cpuinfo
> processor	: 0
> vendor_id	: GenuineIntel
> cpu family	: 6
> model		: 23
> model name	: Pentium(R) Dual-Core  CPU      E6700  @ 3.20GHz
> ...
> [root@...alhost ~]# echo 3 > /proc/irq/18/smp_affinity
> [root@...alhost ~]# cat /proc/irq/18/smp_affinity
> 3
> [root@...alhost ~]# cat /proc/interrupts | grep eth2
>   18:        455       458   IO-APIC-fasteoi   eth2
> [root@...alhost ~]# cat /proc/interrupts | grep eth2
>   18:        463       467   IO-APIC-fasteoi   eth2
> [root@...alhost ~]# cat /proc/interrupts | grep eth2
>   18:        471       476   IO-APIC-fasteoi   eth2
> 
> 
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