Disabling interrupts on a SMP system

Benjamin Herrenschmidt benh at kernel.crashing.org
Fri Oct 29 10:51:30 EST 2004

On Thu, 2004-10-28 at 16:58 -0700, Arrigo Benedetti wrote:

> To achieve real-time performance in a very critical section of code. 
> Even after moving all the
> interrupts to CPU0, there are still two interrupts running on CPU1 that 
> are disturbing the
> execution of the time-critical code:

> 118:         15      21134   OpenPIC   Level     IPI0 (call function)
> 119:        888        904   OpenPIC   Level     IPI1 (reschedule)

Those are normal, they are cross-CPU interrupts used internally by the
kernel. There are also non-visible in that list the timer interrupts on
both CPUs. You just can't do anything against these.


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