It sounds like for z/VM at least, that any performance impact will be dependent 
on the workload and "enablement settings".    And application of these MCLs 
without applying operating system software PTFs will not have an impact on 
system performance.   I would have to assume the z/OS PTFs will show similar 
behaivor.

Dana

On Thu, 11 Jan 2018 03:34:08 +0000, Rugen, Len <rug...@missouri.edu> wrote:

>I wonder if the microcode has a little "detuning" so that if they ever have to 
>make patches that would slow down the system, they can remove a little of the 
>detuning to get back to base performance.
>
>
>Len Rugen
>

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