From: James Lamanna <jlamanna@gmail.com>
To: "Alejandro Riveira Fernández" <ariveira@gmail.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Hardware Interrupt Balancing
Date: Mon, 29 Mar 2010 13:14:35 -0700 [thread overview]
Message-ID: <8E1CBD32-5DCE-4931-A0AB-6713229193D2@gmail.com> (raw)
In-Reply-To: <20100325113618.024b8643@varda>
--James
On Mar 25, 2010, at 3:36, Alejandro Riveira Fernández <ariveira@gmail.co
m> wrote:
> El Wed, 24 Mar 2010 18:11:36 -0700
> James Lamanna <jlamanna@gmail.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
>
prev parent reply other threads:[~2010-03-29 20:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-25 1:11 James Lamanna
2010-03-25 10:36 ` Alejandro Riveira Fernández
2010-03-29 20:14 ` James Lamanna [this message]
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