<snip>
I disagree with both.  z/OS TOD clock is unaffected; user processes
are suspended as necessary to preclude duplicate/anachronistic TIME
readings.
</snip>

I rarely remember the exact details, but I remember enough to know that 
the above is not correct in general.
Spinning with nothing running (which you could consider to be 
"suspended"), until you could not get things appearing out of order, is 
one choice z/OS provides.
It is not the only choice that z/OS provides, depending on your hardware 
configuration.

Clock steering does happen. That might not mean that the machine slows 
down.

Peter Relson
z/OS Core Technology Design


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