Re: [Xen-devel] Xen randomly stuck in mdelay() during MP initialization

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 11.01.12 at 16:28, Julian Pidancet <julian.pidancet@xxxxxxxxx> wrote:
> On Wed, Jan 11, 2012 at 3:12 PM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>
>> Hardly.
>>
>>> but I don't encounter the problem with xen-unstable.
>>
>> Running in x2apic mode, perhaps? (Despite having been asked
>> already, you still didn't really provide technical details about your
>> systems. Nor did you care to attach a log of the successful
>> attempt with -unstable...)
>>
> 
> Yes, disabling x2apic fixes the issue, thank you.
> Is x2apic disabled by default on xen-unstable ? It could explain why
> it doesn't hang with it.

No, it's enabled by default. But AP bringup was changed for the
x2apic case some time ago (which was the reason for my "Hardly"
above).

Jan


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