On Thu, Nov 20, 2014 at 11:46 AM, David Taylor <
[email protected]> wrote:

>
> But I am confused by the simultaneous appearance of a CONFIG_HZ value
> (100) and the apparent N_HZ=y!


Because the HZ in NO_HZ leads you to the wrong conclusion.

NO_HZ means/meant don't deliver timer/preemption interrupts to idle or
single process cpus when there are multiple cpus.  The boot cpu always uses
HZ_NNN, the other cpus (if there are any -- there aren't on my quasi-i486
box) may or may not depending on process contention.  NO_HZ_IDLE is more
suggestive.
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