linux-kernel - Re: Hardware Interrupt Balancing

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Date:	Thu, 25 Mar 2010 11:36:18 +0100
From:	Alejandro Riveira Fernández 
	<ariveira@...il.com>
To:	James Lamanna <jlamanna@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Hardware Interrupt Balancing

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


> 
> Is there something (CPU Hotplug?) preventing the hardware interrupts
> from being balanced across both CPUs?
> The kernel version is 2.6.18 (i686) (this is an older machine that is
> a PSTN<->SIP gateway).
> 
> Thanks.
> 
> -- James
> 
> Please CC me for I am not subscribed.
> --
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