Re: memory alignment problems with -current on amd64? [Found Cause]

On Tue, Feb 10, 2009 at 2:20 PM, Mark Atkinson <atkin901_at_yahoo.com> wrote:
[snip]
>
>
>
> Well, taking the information I knew -- OCT 15th == good, Mid DEC == BAD,
> I trolled every commit logged between.   Eventually I found this one:
>
> http://svn.freebsd.org/viewvc/base?view=revision&revision=185715
>
> http://docs.freebsd.org/cgi/mid.cgi?200812061937.mB6JbqAI003273
>
> I set vm.pmap.pg_ps_enabled="0" in /boot/loader.conf, and
> was able to complete buildworld and -j16 buildworld and -j8 buildkernel
> no problem.
>
> It appears superpage mapping causes alignment problems on this box.


Can you please provide more detailed information about this machine, in
particular, the processor including the revision?  It would also be helpful
to see what gdb says about a couple of these crashes, specifically, the
machine registers at the time of the exception.

Thanks in advance,
Alan