Re: Re: DomU lockups after resume from S3 on Core i5 processors

[Joanna Rutkowska <joanna@invisiblethingslab.com>]

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On 07/06/10 10:41, Jan Beulich wrote:
>>>> On 06.07.10 at 01:17, Jeremy Fitzhardinge <jeremy@goop.org> wrote:
>> On 07/05/2010 03:52 PM, Joanna Rutkowska wrote:
>>> On 07/06/10 00:43, Jeremy Fitzhardinge wrote:
>>>> Do you know what's going on it in that it might be waiting
>>>> for?
>>>>     
>>> No idea. I might be guessing that it would be different kernel
>>> subsystems each time -- e.g. when I'm lucky and when the apps got only
>>> "partially" locked up, I can e.g. open new tabs in Google Chrome, I can
>>> see some thumbnails of my popular websites, but without their contents.
>>> This would suggest the networking subsystem is dead, but at the same
>>> time Chrome is apparently communicating fine with the X server in the
>>> DomU (and which in turn talks fine with Dom0 over Xen shared
>>> memory/evtchanl).
>>>
>>> I experienced the above behavior also when had only one VCPU er DomU.
>>>   
>>
>> I've seen similar things with just normal domain save/restore, where the
>> timer interrupt seems to be failing.  Can you ssh into the domain?  I
>> found that I couldn't do an interactive ssh (hung at the prompt), but a
>> non-interactive command would work, so I could cat /proc/interrupts.
> 
> Did either of you try disabling the setting of sched_clock_stable in
> arch/x86/kernel/cpu/intel.c:early_init_intel()? I found this to be a
> requirement in our pv kernels (though in connection with the use of
> C-states, not with S3).
> 
Before I try it -- can you explain what would be the theory behind it,
specifically how this would be related to HT? Clearly it is a HT
problem, and intuitively, I would expect this to be a Xen-side problem,
rather than DomU-side?

joanna.


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