8.0RC2 amd64 - kernel panic running make buildworld

[Gary Jennejohn]

On Thu, 12 Nov 2009 11:33:30 -0500
John Baldwin <jhb at freebsd.org> wrote:

> On Wednesday 11 November 2009 6:17:53 pm Emil Mikulic wrote:
> > On Tue, Nov 10, 2009 at 09:15:42AM -0800, Mark Atkinson wrote:
> > > Also, you can try adding:
> > > 
> > > hw.mca.enabled="1" in /boot/loader.conf
> > 
> > This is a little off-topic, but:
> > Why is this disabled by default in FreeBSD?
> 
> Because it is still a new feature and on some machines it causes 
> panics/freezes out of the box.  I'd be happier turning it on once it has been 
> tested more and once we've figured out the reasons for the various freezes, 
> etc. that seem to be related to enabling it.
> 

A safer way to test this is to enter
	set hw.mca.enabled="1"
on the loader command line rather than putting it into loader.conf.

I just did this on my "consumer" AMD64 board without ill effect.

---
Gary Jennejohn