From mboxrd@z Thu Jan  1 00:00:00 1970
From: arjan@linux.intel.com (Arjan van de Ven)
Date: Wed, 21 Dec 2011 20:36:12 +0100
Subject: [PATCH 0/3] coupled cpuidle state support
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>>
>> .. or it enters WFI, and a physical device sends it an interrupt,
>> at which point it exits.
> 
> None of the cpus will return to the idle loop until all cpus have
> decremented the ready counter back to 0, so they can't wrap around
> again.


yikes, so you IPI all the cpus on the first exit.
that must burn power ;-(