linux-kernel - Re: early exception error

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Date:	Fri, 2 Jan 2009 10:21:52 -0800 (PST)
From:	david@...g.hm
To:	Andi Kleen <andi@...stfloor.org>
cc:	Cyrill Gorcunov <gorcunov@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: early exception error

On Wed, 31 Dec 2008, david@...g.hm wrote:

> On Thu, 1 Jan 2009, Andi Kleen wrote:
>
>> 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 ?
>
> it gets past the point where the bootmemory_debug messages flow by, but I get 
> another oops (snapshot of the screen is at 
> http://linux.lang.hm/linux/IMG00031.jpg )

oops, I misread your mail, IMG00031.jpg was with numa=off

I just posted IMG00033.jpg which is with numa=noacpi and earlyprintk=vga 
but not bootmem_debug

David Lang

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