From owner-freebsd-ia64@FreeBSD.ORG  Tue Nov 18 13:27:04 2008
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From: Marc =?iso-8859-1?q?L=F6rner?= <marc.loerner@hob.de>
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To: freebsd-ia64@freebsd.org
Date: Tue, 18 Nov 2008 13:59:42 +0100
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Subject: problem with more cpus than MAXCPU
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Hello,
on booting a montecito machine with sources from 7.0-Release-p3
I get an Page-Not-Present fault in vcnt on access of pcpu-struct.
I think this is because of mp_ncpus being the real core number of the machine 
(ia64_count_cpus) and mp_maxid being the cores used (also number of 
pcpu-structs malloced in pcpu-struct).

Also I think (on comparing to other architectures and usage in vcnt) that 
mp_ncpus should be the number of real active cores with malloced pcpu.

So my quick-fix was to put following line after 
"mp_maxid = min(mp_ncpus, MAXCPU) - 1;":
mp_ncpus = mp_maxid + 1;

Regards,
Marc Loerner