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From: Jung-uk Kim <jkim@FreeBSD.org>
To: "army.of.root" <army.of.root@googlemail.com>
Date: Mon, 22 Nov 2010 13:08:55 -0500
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Cc: Ed Schouten <ed@80386.nl>, freebsd-current@FreeBSD.org,
	freebsd-stable@FreeBSD.org, Hans Petter Selasky <hselasky@c2i.net>
Subject: Re: [Call for Tests] PAT issue on Apple hardware
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On Sunday 21 November 2010 06:16 pm, army.of.root wrote:
> On 10\11\19 19:54, Jung-uk Kim wrote:
> > On Tuesday 16 November 2010 03:30 pm, Jung-uk Kim wrote:
> >> On Monday 15 November 2010 08:36 pm, Jung-uk Kim wrote:
> >>> Often times I hear complaints like "my Mac hangs after
> >>> upgrading to 8.1" or "snapshot CD hangs on my brand new Mac". 
> >>> I know some of these complaints started happening when we
> >>> switched to new PAT layout.  It is so puzzling because it never
> >>> happened on non-Apple hardware, AFAIK.  I really like to fix
> >>> this problem but I cannot afford a Mac. :-P
> >>>
> >>> If you are one of those lucky people, please test the attached
> >>> patch and report your hardware model and any improvement or
> >>> regression.
> >>>
> >>> Also, I added a new tunable "vm.pmap.pat_works" so that you can
> >>> turn it off from loader (i.e., "set vm.pmap.pat_works=0") and
> >>> restore old behaviour without recompiling a new kernel.
> >>
> >> I revised this patch to make it more robust.
> >>
> >> http://people.freebsd.org/~jkim/pat-current.diff
> >>
> >> Also, I prepared a patch for stable/8.  If you have recent Apple
> >> hardware and it hangs with 8.1 or stable/8, please test this
> >> patch.
> >>
> >> http://people.freebsd.org/~jkim/pat-stable.diff
> >
> > Anyone?  I don't want to commit it blindly. :-(
> >
> > Jung-uk Kim
>
> <works for me too!>
>
> Hi,
>
> I patched the current 8.1-STABLE snapshot CD's kernel and baked it
> back into the iso.
>
> Before the patch, the kernel would hang, now the livefs cd boots
> fine on my MacBookPro5,5 (2009 13" alu).
>
> Thank you so much ! - I love it.
>
> I attached a dmesg. - Please ask if you need more information, I'd
> be happy to help.
>
> Keep up the awesome work :)

I'll commit the patch to -current shortly.

Thanks for testing!

Jung-uk Kim