[Bug 224841] Power64 regression: Machine does not boot anymore

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224841

--- Comment #17 from Mark Millard <markmi at dsl-only.net> ---
(In reply to commit-hook from comment #16)

>  Revert r327360, which can cause boot problems on high-CPU-count (>60)
>  POWER8 and POWER9 systems, pending further analysis.

Note that comment #9's report is for only
"8 CPUs", quoting:

cpu0: IBM POWER8E revision 2.1, 3425.00 MHz
cpu0: Features dc005180<PPC32,PPC64,ALTIVEC,FPU,MMU,SMT,ARCH205,ARCH206,VSX>
cpu0: Features2 ca000000<ARCH207,HTM,ISEL,VCRYPTO>
real memory  = 8552837120 (8156 MB)
avail memory = 8264536064 (7881 MB)
FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs

That is one of the reasons that I asked about the
"UMA limit" issue for what comment #9 reported.

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