linux-kernel - Re: Bisecting tip/auto-x86-next?

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Date:	Fri, 20 Jun 2008 17:14:36 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Kevin Winchester" <kjwinchester@...il.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>, "Ingo Molnar" <mingo@...hat.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, "Pavel Machek" <pavel@....cz>
Subject: Re: Bisecting tip/auto-x86-next?

On Fri, Jun 20, 2008 at 5:00 PM, Kevin Winchester
<kjwinchester@...il.com> wrote:
> Ingo Molnar wrote:
>>
>> * Kevin Winchester <kjwinchester@...il.com> wrote:
>>
>>>> hm, could you send me the config that triggered this?
>>>
>>> I will do so tonight when I am home again.  It is a UP AMD64 box with a
>>> VIA chipset, if that helps.
>>>
>>>> btw., you can probably ignore this one safely. Also please tell me at
>>>> which commit ID you were at when you triggered this warning.
>>>
>>> Good to know - I will get the commit ID tonight as well, although
>>> wouldn't following the same bisection sequence that I did give you the same
>>> bisection point?  I guess that would assume that linus/master and
>>> auto-x86-next haven't changed much since last night, which might not be
>>> correct.
>>
>> yeah, you'd probably not hit that warning with the x86/gart bisection
>> sequence. (Assuming the bug is introduced in that branch - so you should
>> first check whether pure x86/gart kernel triggers the problem too.)
>>
>> If you still have the commit ID around then please send it - if you dont,
>> no problem, it's no big issue. I wanted to check how wide the bisection
>> window is where the warning triggers.
>>
>
> I'm sorry - I accidentally checkout out x86/gart to test it before grabbing
> the commit ID.
>
> I went ahead with the bisection and found:
>
>
>
> 8c9fd91a0dc503f085169d44f4360be025f75224 is first bad commit
> commit 8c9fd91a0dc503f085169d44f4360be025f75224
> Author: Yinghai Lu <yhlu.kernel@...il.com>
> Date:   Sun Apr 13 18:42:31 2008 -0700
>
>    x86: checking aperture size order
>
>    some systems are using 32M for gart and agp when memory is less than 4G.
>    Kernel will reject and try to allcate another 64M that is not needed,
>    and we will waste 64M of perfectly good RAM.
>
>    this patch adds a workaround by checking aper_base/order between NB and
>    agp bridge. If they are the same, and memory size is less than 4G, it
>    will allow it.
>
>    Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
>    Signed-off-by: Ingo Molnar <mingo@...e.hu>
>    Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
>
> :040000 040000 848d6e4045a14d01fc0a794d4350d8a84f3ceff6
> 4a10a52b41309060cd5dc1bf0c322f6d43b2477b M      arch
> :040000 040000 aa1cee87b1f5b1b30ed03ce6164ad7f404fef2a3
> f9ce0aaa1f7d4fdc7bdc5a43285495db53a6f531 M      drivers
>
>
> as the first bad commit.  I do not have time to look at the patch right now,
> but in case anyone else does, I figured I would post it.
>

please send out whole boot logs with "debug" in command line.

YH
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