On Feb 09, 2015, at 01:01 PM, Konstantin Belousov <k...@freebsd.org> wrote:

Author: kib
Date: Mon Feb 9 21:00:56 2015
New Revision: 278473
URL: https://svnweb.freebsd.org/changeset/base/278473

Log:
Add x2APIC support. Enable it by default if CPU is capable. The
hw.x2apic_enable tunable allows disabling it from the loader prompt.
 
This breaks VMware Fusion when the host CPU has x2APIC support.  In my case, 
mpt(4) was unable to receive interrupts and USB was similarly broken.  It's 
possible that this is a VMware bug, but you might want to avoid turning this on 
when running under the VMware hypervisor.
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