Re: [PATCH] i386 reduce spurious interrupt noise

[Nathan Bryant]

Chris Wedgwood wrote:
> On Thu, Sep 02, 2004 at 12:34:54PM -0700, William Lee Irwin III wrote:
>
>
> > Please check printk_ratelimit().
>
>
> I don't want them displayed by default at *all* --- it wakes up the
> monitor on console machines and that's annoying.
>
> You get about 1 or 2 a day --- rate limiting isn't useful, nor is
> reporting them IMO.

Right, spurious interrupts aren't a big deal on i386. They happen now 
and then with some devices because some hardware timing tolerances are a 
little too tight. See for example sections 5.7.1.3/5.7.4 of the intel 
850 chipset databook 
(http://developer.intel.com/design/chipsets/datashts/29068702.pdf) :

"6. Upon receiving the second internally generated INTA# pulse, the PIC 
returns the interrupt vector. If no interrupt request is present because 
the request was too short in duration, the PIC will return vector 7 from 
the master controller."

"In both the edge-triggered and level-triggered modes, the IRQ inputs 
must remain active until after the falling edge of the first internal 
INTA#. If the IRQ input goes inactive before this time, a default IRQ7 
vector will be returned."

>   --cw
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