Re: [Xen-devel] Xen 4.5 random freeze question

[Andrii Tseglytskyi <andrii.tseglytskyi@xxxxxxxxxxxxxxx>]

Hi Julien,

On Wed, Nov 19, 2014 at 2:23 PM, Julien Grall <julien.grall@xxxxxxxxxx> wrote:
> On 11/19/2014 12:17 PM, Stefano Stabellini wrote:
>> On Wed, 19 Nov 2014, Ian Campbell wrote:
>>> On Wed, 2014-11-19 at 11:42 +0000, Stefano Stabellini wrote:
>>>> So it looks like there is not actually anything wrong, is just that you
>>>> have too much inflight irqs? It should cause problems because in that
>>>> case GICH_HCR_UIE should be set and you should get a maintenance
>>>> interrupt when LRs become available (actually when "none, or only one,
>>>> of the List register entries is marked as a valid interrupt").
>>>>
>>>> Maybe GICH_HCR_UIE is the one that doesn't work properly.
>>>
>>> How much testing did this aspect get when the no-maint-irq series
>>> originally went in? Did you manage to find a workload which filled all
>>> the LRs or try artificially limiting the number of LRs somehow in order
>>> to provoke it?
>>>
>>> I ask because my intuition is that this won't happen very much, meaning
>>> those code paths may not be as well tested...
>>
>> I did test it by artificially limiting the number of LRs to 1.
>> However there have been many iterations of that series and I didn't run
>> this test at every iteration.
>
> am I the only to think this may not be related to this bug? All the LRs
> are full with IRQ of the same priority. So it's valid.
>
> As gic_restore_pending_irqs is called every time that we return to the
> guest. It could be anything else.
>
> It would be interesting to see why we are trapping all the time in Xen.
>

I may perform any test if you have some specific scenario.


> Regards,
>
> --
> Julien Grall



-- 

Andrii Tseglytskyi | Embedded Dev
GlobalLogic
www.globallogic.com

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