linux-kernel - Re: early exception error

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Date:	Thu, 1 Jan 2009 05:17:27 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	david@...g.hm
Cc:	Andi Kleen <andi@...stfloor.org>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: early exception error

On Wed, Dec 31, 2008 at 12:59:08PM -0800, david@...g.hm wrote:
> On Wed, 31 Dec 2008, Andi Kleen wrote:
> 
> >>on the picture you sent me i noticed the message
> >>"Your memory is not aligned you need to rebuild your
> >>kernel with bigger NODEMAP SIZE shift=20" and then
> >>srat code complains about "No NUMA code hash function found"
> >>which looks a bit scary. Btw, could you post this picture
> >>on some public resource so NUMA people could check it?
> >
> >This case used to be handled cleanly (NUMA disabled), but perhaps
> >that has regressed. But still it sounds like something is going wrong,
> >unless his machine really has a very weird memory map.
> 
> it shouldn't, it was one of the high-volume servers 4-5 years ago and only 
> has 4G of ram in it

>From looking at the screenshot Cyrill sent you seem to have a funny
SRAT with overlapping areas that is rejected in the end. I suspect the 
fallback code doesn't handle this properly.

Does it work when you boot with numa=noacpi ? 

-Andi

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