Re: svn commit: r278473 - in head/sys: amd64/amd64 amd64/include amd64/vmm contrib/dev/acpica/include i386/i386 i386/include x86/acpica x86/include x86/x86 x86/xen

[Rui Paulo]

On Feb 09, 2015, at 01:01 PM, Konstantin Belousov <kib at 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.