Jan Kiszka wrote:
 > There is a shadow relax procedure running before the timer IRQ fires,
 > and that takes another context switch. So the latency sum is:
 >  - unrelated context switch
 >  - timer IRQ
 >  - switch to woken up RT process
 >  - serial IRQ
 > Almost the theoretical worst case.

The problem is that it does not happen when launching latency with -t 1
or -t 2, or if latency is not run in the background.

Anyway, I will investigate on the double ack issue, because it could
mean that there is a double EOI, which, I guess could cause some
troubles at interrupt controller level.


                                            Gilles Chanteperdrix.

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