By any chance is the IWM067I message being displayed?
Some reasons that the mode 2 is not being honored, per that message, are:
HIPERDISPATCH FUNCTION IS NOT ACTIVE
WAITCOMPLETION=YES IS SET
Allan Winston
On Mon, Feb 2, 2026 at 9:33 AM Jay Maynard <
[email protected]> wrote:
> We've enabled MT_ZIIP_MODE=2 on our systems. At yesterday morning's
> production LPAR IPL, I expected it to take effect; it's in IEAOPT00, with
> PROCVIEW=CORE in LOADxx.
>
> Instead, we had the zIIP multithreading mode equal to 1 after the IPL,
> according to D M=CPU. Issuing SET OPT=00 changed the mode without having to
> do anything else.
>
> Am I missing something?
> --
> Jay Maynard
>
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