Re: ERR in /proc/interrupts

From: Andreas Schwarz (usenet.2117_at_andreas-s.net)
Date: 09/30/03

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    To: linux-kernel@vger.kernel.org
    Date:	Tue, 30 Sep 2003 17:54:07 +0000 (UTC)
    
    

    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)!

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