ERR in /proc/interrupts

Andreas Schwarz

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Sep 30, 2003, 5:50:06 AM9/30/03

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I get a very high ERR count in /proc/interrupts. If I move my USB mouse
the number increases.

What does ERR mean? Nothing good, I suppose?

Kernel: 2.6.0-test6-mm1

/proc/interrupts:
====================================================

CPU0
0: 1924793 XT-PIC timer
1: 9571 XT-PIC i8042
2: 0 XT-PIC cascade
5: 1561 XT-PIC ohci-hcd, eth1
8: 2 XT-PIC rtc
9: 0 XT-PIC acpi
10: 0 XT-PIC ehci_hcd, ohci-hcd, eth0
11: 31910 XT-PIC EMU10K1, uhci-hcd, uhci-hcd
14: 12483 XT-PIC ide0
15: 41 XT-PIC ide1
NMI: 0
LOC: 1924399
ERR: 15255
MIS: 0

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Christian

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Sep 30, 2003, 6:30:08 AM9/30/03

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Andreas Schwarz wrote:
> I get a very high ERR count in /proc/interrupts. If I move my USB mouse
> the number increases.
>
> What does ERR mean? Nothing good, I suppose?
>

../Documentation/filesystems/proc.txt says:

ERR is incremented in the case of errors in the IO-APIC bus (the bus
that connects the CPUs in a SMP system. This means that an error has
been detected, the IO-APIC automatically retry the transmission, so it
should not be a big problem, but you should read the SMP-FAQ.

Christian, knowing nothing more than this too :-)

Andreas Schwarz

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Sep 30, 2003, 6:40:08 AM9/30/03

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Christian wrote:
> Andreas Schwarz wrote:
>> I get a very high ERR count in /proc/interrupts. If I move my USB mouse
>> the number increases.
>>
>> What does ERR mean? Nothing good, I suppose?
>>
>
> ../Documentation/filesystems/proc.txt says:
>
> ERR is incremented in the case of errors in the IO-APIC bus (the bus
> that connects the CPUs in a SMP system. This means that an error has
> been detected, the IO-APIC automatically retry the transmission, so it
> should not be a big problem, but you should read the SMP-FAQ.

I don't have a SMP kernel. I compiled the kernel with IO APIC support,
but disabled it later with the noapic kernel boot option.

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-> http://www.mikrocontroller.net

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Raj

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Sep 30, 2003, 6:50:09 AM9/30/03

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> ERR is incremented in the case of errors in the IO-APIC bus (the bus

I have observed that ERR is incremented in case of spurious interrupts
too.

/Raj

Andreas Schwarz

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Sep 30, 2003, 2:00:34 PM9/30/03

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Andreas Schwarz wrote:
> Christian wrote:
>> Andreas Schwarz wrote:
>>> I get a very high ERR count in /proc/interrupts. If I move my USB mouse
>>> the number increases.
>>>
>>> What does ERR mean? Nothing good, I suppose?
>>>
>>
>> ../Documentation/filesystems/proc.txt says:
>>
>> ERR is incremented in the case of errors in the IO-APIC bus (the bus
>> that connects the CPUs in a SMP system. This means that an error has
>> been detected, the IO-APIC automatically retry the transmission, so it
>> should not be a big problem, but you should read the SMP-FAQ.
>
> I don't have a SMP kernel. I compiled the kernel with IO APIC support,
> but disabled it later with the noapic kernel boot option.

I recompiled the kernel with both APIC options disabled. Result: ERR is
0, and my USB mouse is no longer choppy.

APIC = evil (at least on my K7S5A Pro)!