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    SubjectRe: [PATCH] i386 reduce spurious interrupt noise
    On Fri, Sep 10, 2004 at 11:23:20PM +0200, Maciej W. Rozycki wrote:

    > > - printk (KERN_INFO "APIC error on CPU%d: %02lx(%02lx)\n",
    > > + printk (KERN_DEBUG "APIC error on CPU%d: %02lx(%02lx)\n",

    > This should probably be KERN_ERR even. This is a serious condition -- if
    > you ever get such a message, then inter-APIC messages get corrupted and
    > this affects system's stability.

    These messages are very common on many platforms, infrequent (once
    very few days to twice a day at most in my observations) and seemingly
    harmless.

    I agree that if you get *many* of these certainly that would indicate
    there is a problem but I've not not heard a single instance of this
    and if that is the case we need to deal with it differently.

    > > - printk("spurious 8259A interrupt: IRQ%d.\n", irq);
    > > + printk(KERN_DEBUG "spurious 8259A interrupt: IRQ%d.\n", irq);

    > You may ever get a single message per system boot from this line.

    Sometimes as boot, though often in my experience several minutes after
    boot.

    > It encourages to have a look at the ERR counter in /proc/interrupts
    > to check for possible problems, though admittedly the suggestion
    > isn't especially clear.

    I think in *both* cases we want to detect a largish (more than 1 ever
    n seconds or so) number of these and then complain, not before and
    even then not excessively so that we printk our-selves to death.

    I'm not inclined to offer such a patch right now as it feels like it's
    fixing a problem nobody has reported.


    --cw
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