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    SubjectRe: Bisecting tip/auto-x86-next?
    On Sat, Jun 21, 2008 at 7:18 AM, Yinghai Lu <yhlu.kernel@gmail.com> wrote:
    > On Sat, Jun 21, 2008 at 3:00 AM, Kevin Winchester
    > <kjwinchester@gmail.com> wrote:
    >> Yinghai Lu wrote:
    >>>
    >>> On Fri, Jun 20, 2008 at 5:00 PM, Kevin Winchester
    >>> <kjwinchester@gmail.com> wrote:
    >>>>
    >>>> Ingo Molnar wrote:
    >>>>>
    >>>>> * Kevin Winchester <kjwinchester@gmail.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@gmail.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@gmail.com>
    >>>> Signed-off-by: Ingo Molnar <mingo@elte.hu>
    >>>> Signed-off-by: Thomas Gleixner <tglx@linutronix.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.
    >>>
    >>
    >> "debug" in the command line doesn't seem to have any effect on the printout
    >> (is there some config option I need to use with it?), but here it is anyway:
    >
    > are you using tip/master?
    >
    > http://people.redhat.com/mingo/sched-devel.git/README
    >

    That log is from tip/x86/gart, which is where the problem patch was
    bisected. Would you get better debugging info from tip/master (which
    includes tip/x86/gart, I believe, and thus would show the problem as
    well)?

    --
    Kevin Winchester


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