Re: Hardware Interrupt Balancing
From: Alejandro Riveira FernÃndez
Date: Thu Mar 25 2010 - 06:36:32 EST
El Wed, 24 Mar 2010 18:11:36 -0700
James Lamanna <jlamanna@xxxxxxxxx> escribiÃ:
> 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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