+2. Many architectures will place dyntick-idle CPUs into deep sleep + states, which further degrades from-idle transition latencies. +
I think this part should just be deleted. On x86, the deeper idle states are even used with non-tickless system (the break even times are quite a bit less than even 1 msec). I can't imagine that ARM is worse on this, at which point the statement above is highly dubious
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