linux-kernel - Re: 2.6.25-rc5-git6: Reported regressions from 2.6.24

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Date:	Fri, 21 Mar 2008 19:11:27 +0100
From:	Gabriel C <crazy@...galware.org>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Gabriel C <nix.or.die@...glemail.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	Adrian Bunk <bunk@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Natalie Protasevich <protasnb@...il.com>,
	andi-bz@...stfloor.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.25-rc5-git6: Reported regressions from 2.6.24

Gabriel C wrote:
> Thomas Gleixner wrote:
>> On Fri, 21 Mar 2008, Gabriel C wrote:
>>  
>>>> still hangs when I boot with clocksource=acpi_pm so that seems to
>>>> be introduced in a different commit.
>>>>
>>>> I will try to bisect this hang also , most probably on weekend.
>>>>
>>> Correction on this one.
>>>
>>> Current git head boots just fine with clocksource=acpi_pm here , I
>>> just don't know which commit fixed it.
>> Hmm. Very dubious. I'm a bit afraid of self healing problems. It would
>> be interesting to find the commit which fixed the acpi_pm timer
>> problem unvoluntary.
> 
> I can try to find it.
> 
>> Also, can you please reapply the reverted clocksource patch ? I have
>> the feeling that the acpi_pm one was the real problem which was
>> triggered the modfied watchdog.
> 
> Sure I can , will do so in some minutes and let you know.

It took a bit longer sorry but I have more infos now.

The acpi_pm was not related to that I still get the problem.

Of course I still can try to find the commit which magically fixed acpi_pm if you really want.

It seems like it breaks only when you enable HT and only on 2 socket motherboards. 
( at least the ones I own , I know is old hardware but worked fine for me )

Also disabling the second CPU and enabling HT works , enabling both CPUs and disabling HT works ,
booting with enabled HT and both CPUs but maxcpus=2 also works , booting with 2 CPUs and HT on breaks ,
booting with both CPUs HT on but maxcpus=3 breaks also.

Also I have another dual motherboard here 604 socket with 2 2,4 GHz Xeon's.
The motherboard has the storage controller somewhat broken but for a quick test it is still good :) and I see the
same thing.

Does that make any sense ?

Also all that tested on 2.6.25-rc6-00224-gae51801-dirty ( dirty while I reverted the revert =) )

Gabriel
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