David Miller wrote:

> From: "Michael Chan" <[EMAIL PROTECTED]>
> Date: Fri, 04 May 2007 18:45:58 -0700
> 
> > We had a discussion about 2 years ago and David decided to 
> > remove the I/O read to improve performance.  Since then a
> > small number of users have been complaining about spurious
> > interrupts.  We can add back the unconditional read or do
> > this detection thing which I agree is somewhat annoying.
> > David, what do you think?
> 
> If we get an extra interrupt, we should just silently ignore it.
> 
> The performance impact of adding that thing back is just too great.
> 

In a small number of cases, we really get a ton of spurious interrupts.
We have even seen the kernel shutting off IRQ7 because of too many
unclaimed spurious interrupts.

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