On 05/12/2011 02:20 AM, Paul E. McKenney wrote:
> On Thu, May 12, 2011 at 12:42:50AM -0700, Yinghai Lu wrote:
>> On 05/12/2011 12:27 AM, Yinghai Lu wrote:
>>> On 05/11/2011 11:03 PM, Ingo Molnar wrote:
>>>>
>>>> * Yinghai Lu <yinghai@kernel.org> wrote:
>>>>
>>>>> e59fb3120becfb36b22ddb8bd27d065d3cdca499 is the first bad commit
>>>>> commit e59fb3120becfb36b22ddb8bd27d065d3cdca499
>>>>> Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
>>>>> Date:   Tue Sep 7 10:38:22 2010 -0700
>>>>>
>>>>>     rcu: Decrease memory-barrier usage based on semi-formal proof
>>>>
>>>> Find below an (untested!) attempt at reverting it for debugging purposes: could 
>>>> you please try it, does your system now boot up fine?
>>>>
>>>> Thanks,
>>>>
>>>> 	Ingo
>>>>
>>>
>>> yes, reverted manually that commit fix the problem.
>>
>> on system with 8 sockets westmere-ex
>>
>> it seems other commits after that commit contribute some delay too.
>>
>> [   32.240739] cpu_dev_init done
>> [   73.587288] memory_dev_init done
> 
> I am testing a revert of e59fb3120becfb36b22ddb8bd27d065d3cdca499 and
> will chase down the delay.
> 
> Could you please send along your .config file?
> 

please check attached config.

Thanks

Yinghai