linux-kernel - Re: Hardware Interrupt Balancing

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Message-Id: <8E1CBD32-5DCE-4931-A0AB-6713229193D2@gmail.com>
Date:	Mon, 29 Mar 2010 13:14:35 -0700
From:	James Lamanna <jlamanna@...il.com>
To:	Alejandro Riveira Fernández <ariveira@...il.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Hardware Interrupt Balancing



--James

On Mar 25, 2010, at 3:36, Alejandro Riveira Fernández <ariveira@...il.co 
m> wrote:

> El Wed, 24 Mar 2010 18:11:36 -0700
> James Lamanna <jlamanna@...il.com> escribió:
>
>> Hi,
>> I have a Dual Xeon (single core each w/HT) machine and I noticed the
>> other day that interrupts are not
>> being balanced across the 2 processors:
>>
>>          CPU0       CPU1       CPU2       CPU3
>>  0:        306          0          0 3254413993    IO-APIC-edge   
>> timer
>>  1:          0          0          0      13468    IO-APIC-edge   
>> i8042
>>  8:          0          0          0          3    IO-APIC-edge  rtc
>>  9:          0          0          0          0   IO-APIC-level  acpi
>> 12:          0          0          0          4    IO-APIC-edge   
>> i8042
>> 169:          0          0          0          0   IO-APIC-level   
>> uhci_hcd:usb2
>> 177:          0          0          0   16743166   IO-APIC-level   
>> ata_piix
>> 185:          0          0          0          1   IO-APIC-level   
>> ehci_hcd:usb1
>> 193:          0          0          0          0   IO-APIC-level   
>> uhci_hcd:usb3
>> 201:          0          0          0 1867922172   IO-APIC-level   
>> eth0
>> 209:          0          0          0 3254690559   IO-APIC-level   
>> wct4xxp
>> NMI:          1          0          0          0
>> LOC: 3255261535 3255261540 3255261549 3255220504
>> ERR:          0
>> MIS:          0
>>
>> However the cpu_affinity of say, wct4xxp is:
>> # cat /proc/irq/209/smp_affinity
>> 0000000f
>
> Maybe you just need to run irqbalance http://www.irqbalance.org/
> « sudo aptitude install irqbalance » in Debian system

I do not want to use irq balance because everytime irqbalance moves  
the CPU of my PRI card, there is a hiccup in voice calls.
I manually moved the interrupts for the wct4xxp to CPU0 using  
smp_affinity = 1.

However today I got a lot of soft lockups on CPU0 due to asterisk in  
udp_sendmsg() - unsure if moving the interrupt caused this...could it?

Thanks.

-- James
>
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