High interrupt count on irq12

[Darren Pilgrim]

Gardner Bell wrote:
> Since I installed -CURRENT, I've noticed irq12 has a rather high
> interrupt count for only 29mins of uptime.  Interrupt load appears to
> be rather low at only 0.4% so I'm not sure what can be causing the high
> count.  Here is the output of vmstat.
> 
> dan at home$ vmstat -i
> interrupt                          total       rate
> irq1: atkbd0                        3011          1
> irq12: psm0                       121265         61
> irq14: ata0                           58          0
> irq19: uhci1+                       5181          2
> irq20: fxp0                         1377          0
> irq22: pcm0                           11          0
> cpu0: timer                      3812581       1923
> cpu1: timer                      3812247       1923
> Total                            7755731       3913
> 
> My kernel is pretty much GENERIC except for the removal of drivers that
> I don't use/need, WITNESS, and INVARIANTS.

Nothing wrong with that number unless you don't use the mouse.  Mice 
generate anywhere from dozens to hundreds of interrupts per second 
depending on the hardware type port settings.  An hour's worth of 
regular desktop usage could easily generate the amount shown above.

-- 
Darren Pilgrim