linux-kernel - Re: timer interrupt handled by CPU0 only

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Message-ID:  <8buqd6-bab.ln1@woodchuck.wormnet.eu>
Date:	Wed, 13 May 2009 14:25:28 +0100
From:	Alexander Clouter <alex@...riz.org.uk>
To:	linux-kernel@...r.kernel.org
Subject:  Re: timer interrupt handled by CPU0 only

qmh524 <qmh524@...il.com> wrote:
>
> I have start irqbalance service. Why the timer interrupt only happend in CPU0
>
irqBALANCE...you could also ask why all your eth0 IRQ's are on CPU3 or 
your ATA action is on CPU2.

It's my understanding you *steer* IRQ's to a CPU, you do not round-robin 
them across all the CPU's.

Cheers

> $ sudo service irqbalance status
> irqbalance (pid 2390) is running...
> $ cat /proc/interrupts
>           CPU0       CPU1       CPU2       CPU3
>  0:   21487296          0          0          0    IO-APIC-edge  timer
>  1:          3          0          0          0    IO-APIC-edge  i8042
>  8:          1          0          0          0    IO-APIC-edge  rtc
>  9:          0          0          0          0   IO-APIC-level  acpi
> 12:          4          0          0          0    IO-APIC-edge  i8042
> 74:         18          0          0          0   IO-APIC-level
> uhci_hcd:usb1, uhci_hcd:usb3, ehci_hcd:usb4
> 82:          0          0          0          0   IO-APIC-level  uhci_hcd:usb2
> 90:       1934          0   45886283          0   IO-APIC-level  libata
> 98:          0          0          0          0   IO-APIC-level  libata
> 106:        120          0          0   22824923         PCI-MSI  eth0
> 169:      16933          0    9370507          0   IO-APIC-level  ioc0
> NMI:      43241      26776      33934      29946
> LOC:   21487192   21487118   21487046   21486887
> ERR:          0
> MIS:          0

-- 
Alexander Clouter
.sigmonster says: A hammer sometimes misses its mark - a bouquet never.

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