More than 32 CPUs under 8.4-P

[Dennis Glatting]

On Sun, 2013-05-19 at 11:48 +0200, Tijl Coosemans wrote:
> On 2013-05-18 19:13, Dennis Glatting wrote:
> > I have a 4x16=64 core server running FreeBSD 8.4-P but only two of the
> > CPUs (2x16=32) are enabled. Enabling the other 32 isn't as simple as
> > changing MAXCPU in param.h (apparently) and recompiling.
> > 
> > What do I need to do to enable the other 32 cores?
> 
> Try FreeBSD 9.x. MAXCPU is 64 there.
> 

Not an option. 

ZFS hangs on multi-socket systems (Tyan, Supermicro) under 9.1. ZFS does
not hang under 8.4. This (and one other 4 socket) is a production
system.