Re: [Xen-devel] kernel bootup slow issue on ovm3.1.1

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 08.08.12 at 11:48, "zhenzhong.duan" <zhenzhong.duan@xxxxxxxxxx> wrote:
> ä 2012-08-07 16:37, Jan Beulich åé:
>>>>> On 07.08.12 at 09:22, "zhenzhong.duan"<zhenzhong.duan@xxxxxxxxxx>  wrote:
>>> After some debug, we found it's in kernel mtrr init that make this delay.
>>>
>>> mtrr_aps_init()
>>>   \->  set_mtrr()
>>>       \->  mtrr_work_handler()
>>>
>>> kernel spin in mtrr_work_handler.
>>>
>>> But we don't know the scene hide in the hypervisor. Why big mem +
>>> passthrough made the worst case.
>>> Is this already fixed in xen upstream?
>> First of all it would have been useful to indicate the kernel version,
>> since mtrr_work_handler() disappeared after 3.0. Obviously worth
>> checking whether that change by itself already addresses your
>> problem.
> No luck, tried upstream kernel 3.6.0-rc1, seems worse. It took 2 hours 
> to boot up.

That's quite a big step from 3.0.x. And in another response you
point out that 3.6 is way worse than 3.5 was. So maybe going
back to 3.1 or 3.2 might be a better idea if debugging the issue
doesn't get you anywhere.

Jan

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