linux-kernel - Re: early exception error

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Message-ID: <20090102172426.GB5372@localhost>
Date:	Fri, 2 Jan 2009 20:24:26 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	david@...g.hm
Cc:	Andi Kleen <andi@...stfloor.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: early exception error

[david@...g.hm - Fri, Jan 02, 2009 at 10:21:52AM -0800]
> 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
>

Thanks, David! Trying to understand what is going on :)

Here is a new picture if someone would like to jump into
the bug handling

	http://linux.lang.hm/linux/IMG00033.jpg

		- Cyrill -
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