Messages in this thread | | | Date | Thu, 02 Sep 2004 16:13:42 -0400 | From | Nathan Bryant <> | Subject | Re: [PATCH] i386 reduce spurious interrupt noise |
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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."
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